{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T05:03:54Z","timestamp":1787029434824,"version":"build-2736575974"},"reference-count":94,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2025,11,29]],"date-time":"2025-11-29T00:00:00Z","timestamp":1764374400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Polymer Electrolyte Membrane and Direct Methanol Fuel Cells (PEMFCs\/DMFCs) are vital clean energy technologies, yet their adoption is hindered by limitations in industry-standard PFSA membranes. PFSA degrades above 80 \u00b0C, suffers substantial methanol crossover, and contains environmentally persistent PFAS, which raises significant environmental and cost concerns due to its persistence and bioaccumulation, driving a global imperative for sustainable, fluorine-free alternatives. In response to these challenges, the PCAM Lab has dedicated extensive research efforts to developing advanced PEMs. A primary focus is non-fluorinated alternatives (NFPs), including sulfonated Polysulfone (sPSU) and Sulfonated polyether ether ketone (sPEEK), which have emerged as a compelling, cost-effective, and environmentally friendly alternative to the PFSA benchmark. Beyond NFPs\u2019 intrinsic advantages, the lab\u2019s implementation of nanocomposite strategies, involving the incorporation of various functional nanofillers, has proven transformative. This report provides a comprehensive, critical analysis of the state of the art in PEM research, contextualizing the specific contributions of the Physical Chemistry Applied Materials (PCAM) Lab within the broader global scientific dialog. While the PCAM Lab has made notable strides in utilizing Sulfonated Polysulfone (sPSU) and nanocomposite strategies, a true assessment of the field requires integrating these findings with the seminal works of leading international research groups. By synthesizing data on sulfonated polyphenylenes, advanced graphene architectures, and industrial manufacturing constraints, this analysis illuminates the divergent pathways currently being explored to overcome the \u201cNafion Dilemma\u201d.<\/jats:p>","DOI":"10.3390\/polym17233185","type":"journal-article","created":{"date-parts":[[2025,12,2]],"date-time":"2025-12-02T15:31:46Z","timestamp":1764689506000},"page":"3185","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Evolutionary Strategies in Nanocomposite Proton Exchange Membranes: A Physical Chemistry Applied Materials (PCAM) LAB Review on Material Design, High-Temperature Performance, and Durability"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4411-0573","authenticated-orcid":false,"given":"Isabella","family":"Nicotera","sequence":"first","affiliation":[{"name":"Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luigi","family":"Coppola","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6154-5456","authenticated-orcid":false,"given":"Cataldo","family":"Simari","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2069","DOI":"10.1007\/s10311-020-01059-w","article-title":"Strategies for mitigation of climate change: A review","volume":"18","author":"Fawzy","year":"2020","journal-title":"Environ. Chem. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"598","DOI":"10.1016\/j.gloenvcha.2013.02.006","article-title":"Fossil fuel addiction and the implications for climate change policy","volume":"23","author":"Suranovic","year":"2013","journal-title":"Glob. Environ. Change"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"850","DOI":"10.1038\/nclimate2392","article-title":"Betting on negative emissions","volume":"4","author":"Fuss","year":"2014","journal-title":"Nat. Clim. Change"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.jiec.2014.04.030","article-title":"A review of polymer-nanocomposite electrolyte membranes for fuel cell application","volume":"21","author":"Kim","year":"2015","journal-title":"J. Ind. Eng. Chem."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1371","DOI":"10.1016\/j.petsci.2021.11.004","article-title":"Du Recent developments in high-performance Nafion membranes for hydrogen fuel cells applications","volume":"19","author":"Zhu","year":"2022","journal-title":"Pet. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2025036","DOI":"10.20517\/microstructures.2024.84","article-title":"Advances and advantages of metal-organic framework and its composite membrane as proton conduction materials","volume":"5","author":"Li","year":"2025","journal-title":"Microstructures"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"4535","DOI":"10.1021\/cr0207123","article-title":"State of understanding of nafion","volume":"104","author":"Mauritz","year":"2004","journal-title":"Chem. Rev."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"127329","DOI":"10.1016\/j.cej.2020.127329","article-title":"Progress in hybrid composite Nafion\u00ae-based membranes for proton exchange fuel cell application","volume":"409","author":"Prykhodko","year":"2021","journal-title":"Chem. Eng. J."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"987","DOI":"10.1021\/acs.chemrev.6b00159","article-title":"New Insights into Per fl uorinated Sulfonic-Acid Ionomers","volume":"117","author":"Kusoglu","year":"2017","journal-title":"Chem. Rev."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"110660","DOI":"10.1016\/j.rser.2020.110660","article-title":"Overcoming undesired fuel crossover: Goals of methanol-resistant modification of polymer electrolyte membranes","volume":"138","author":"Zhou","year":"2021","journal-title":"Renew. Sustain. Energy Rev."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"122299","DOI":"10.1016\/j.carbpol.2024.122299","article-title":"Alternative proton exchange membrane based on a bicomponent anionic nanocellulose system","volume":"340","author":"Kaschuk","year":"2024","journal-title":"Carbohydr. Polym."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1259","DOI":"10.1007\/s11581-016-1756-4","article-title":"A review of polymer electrolytes: Fundamental, approaches and applications","volume":"22","author":"Ngai","year":"2016","journal-title":"Ionics"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"28919","DOI":"10.1016\/j.ijhydene.2019.09.096","article-title":"Recent approaches to improve Nafion performance for fuel cell applications: A review","volume":"44","author":"Karimi","year":"2019","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Simari, C. (2023). NMR Investigation of Water Molecular Dynamics in Sulfonated Polysulfone\/Layered Double Hydroxide Composite Membranes for Proton Exchange Membrane Fuel Cells. Membranes, 13.","DOI":"10.3390\/membranes13070684"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1002\/(SICI)1097-4628(19981017)70:3<477::AID-APP8>3.0.CO;2-K","article-title":"Sulfonation of polyetheretherketone by chlorosulfuric acid","volume":"70","author":"Trotta","year":"1998","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1016\/j.memsci.2009.09.041","article-title":"Sulfonated poly(ether ether ketone)-based silica nanocomposite membranes for direct ethanol fuel cells","volume":"346","author":"Roelofs","year":"2010","journal-title":"J. Memb. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"228440","DOI":"10.1016\/j.jpowsour.2020.228440","article-title":"Highly-performing and low-cost nanostructured membranes based on Polysulfone and layered doubled hydroxide for high-temperature proton exchange membrane fuel cells","volume":"471","author":"Simari","year":"2020","journal-title":"J. Power Sources"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Rehman, M.H.U., Lufrano, E., and Simari, C. (2023). Nanocomposite Membranes for PEM-FCs: Effect of LDH Introduction on the Physic-Chemical Performance of Various Polymer Matrices. Polymers, 15.","DOI":"10.3390\/polym15030502"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"20647","DOI":"10.1016\/j.ijhydene.2020.02.101","article-title":"Barrier properties of sulfonated polysulfone\/layered double hydroxides nanocomposite membrane for direct methanol fuel cell operating at high methanol concentrations","volume":"45","author":"Lufrano","year":"2020","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"117858","DOI":"10.1016\/j.memsci.2020.117858","article-title":"Advances in hybrid composite membranes engineering for high-performance direct methanol fuel cells by alignment of 2D nanostructures and a dual-layer approach","volume":"599","author":"Simari","year":"2020","journal-title":"J. Memb. Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"24357","DOI":"10.1021\/jp5080779","article-title":"Sulfonated graphene oxide platelets in nafion nanocomposite membrane: Advantages for application in direct methanol fuel cells","volume":"118","author":"Nicotera","year":"2014","journal-title":"J. Phys. Chem. C"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"240","DOI":"10.1016\/j.electacta.2018.11.190","article-title":"Graphene oxide and sulfonated-derivative: Proton transport properties and electrochemical behavior of Nafion-based nanocomposites","volume":"297","author":"Simari","year":"2019","journal-title":"Electrochim. Acta"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"138214","DOI":"10.1016\/j.electacta.2021.138214","article-title":"Polysulfone and organo-modified graphene oxide for new hybrid proton exchange membranes: A green alternative for high-efficiency PEMFCs","volume":"380","author":"Simari","year":"2021","journal-title":"Electrochim. Acta"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"27940","DOI":"10.1016\/j.ijhydene.2017.05.014","article-title":"NMR investigation on nanocomposite membranes based on organosilica layered materials bearing different functional groups for PEMFCs","volume":"42","author":"Nicotera","year":"2017","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Loise, V., and Simari, C. (2025). Next-Generation Nafion Membranes: Synergistic Enhancement of Electrochemical Performance and Thermomechanical Stability with Sulfonated Siliceous Layered Material (sSLM). Polymers, 17.","DOI":"10.3390\/polym17131866"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Simari, C., Enotiadis, A., and Nicotera, I. (2020). Transport Properties and Mechanical Features of Sulfonated Polyether Ether Ketone\/Organosilica Layered Materials Nanocomposite Membranes for Fuel Cell Applications. Membranes, 10.","DOI":"10.3390\/membranes10050087"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2574","DOI":"10.1021\/acs.jpcc.5b11871","article-title":"Clay-Carbon Nanotubes Hybrid Materials for Nanocomposite Membranes: Advantages of Branched Structure for Proton Transport under Low Humidity Conditions in PEMFCs","volume":"120","author":"Simari","year":"2016","journal-title":"J. Phys. Chem. C"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2113","DOI":"10.1007\/s11581-017-2059-0","article-title":"Reduced methanol crossover and enhanced proton transport in nanocomposite membranes based on clay\u2212CNTs hybrid materials for direct methanol fuel cells","volume":"23","author":"Simari","year":"2017","journal-title":"Ionics"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"488","DOI":"10.1016\/j.nanoen.2015.07.014","article-title":"Graphene oxide: A promising nanomaterial for energy and environmental applications","volume":"16","author":"Li","year":"2015","journal-title":"Nano Energy"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Simari, C., Lufrano, E., Godbert, N., Gournis, D., Coppola, L., and Nicotera, I. (2020). Titanium dioxide grafted on graphene oxide: Hybrid nanofiller for effective and low-cost proton exchange membranes. Nanomaterials, 10.","DOI":"10.3390\/nano10081572"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Tursi, A., Beneduci, A., Nicotera, I., and Simari, C. (2023). MWCNTs Decorated with TiO2 as Highly Performing Filler in the Preparation of Nanocomposite Membranes for Scalable Photocatalytic Degradation of Bisphenol A in Water. Nanomaterials, 13.","DOI":"10.3390\/nano13162325"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1007\/s40243-024-00266-7","article-title":"Novel Nafion nanocomposite membranes embedded with TiO2-decorated MWCNTs for high-temperature\/low relative humidity fuel cell systems","volume":"13","author":"Nicotera","year":"2024","journal-title":"Mater. Renew. Sustain. Energy"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"56","DOI":"10.1016\/j.ijhydene.2024.09.282","article-title":"Enhancing sulfonated polyethersulfone performance by incorporating TiO2-decorated MWCNTs: A viable solution for high-temperature polymer electrolyte fuel cell applications","volume":"89","author":"Nicotera","year":"2024","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"336","DOI":"10.1016\/j.renene.2020.06.053","article-title":"Sulfonated polyethersulfone\/polyetheretherketone blend as high performing and cost-effective electrolyte membrane for direct methanol fuel cells","volume":"159","author":"Simari","year":"2020","journal-title":"Renew. Energy"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1016\/S0920-5861(01)00290-5","article-title":"Sulfonated polyether ether ketone based composite polymer electrolyte membranes","volume":"67","author":"Mikhailenko","year":"2001","journal-title":"Catal. Today"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2046","DOI":"10.1002\/(SICI)1097-4628(19991121)74:8<2046::AID-APP20>3.0.CO;2-3","article-title":"Sulfonated polyethersulfone by heterogeneous method and its membrane performances","volume":"74","author":"Kim","year":"1999","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Simari, C., Nicotera, I., Aric\u00f2, A.S., Baglio, V., and Lufrano, F. (2021). New insights into properties of methanol transport in sulfonated polysulfone composite membranes for direct methanol fuel cells. Polymers, 13.","DOI":"10.3390\/polym13091386"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Simari, C., Prejan\u00f2, M., Lufrano, E., Sicilia, E., and Nicotera, I. (2021). Exploring the Structure\u2013Performance Relationship of Sulfonated Polysulfone Proton Exchange Membrane by a Combined Computational and Experimental Approach. Polymers, 13.","DOI":"10.3390\/polym13060959"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"115581","DOI":"10.1016\/j.ssi.2021.115581","article-title":"Anisotropic behavior of mechanically extruded sulfonated polysulfone: Implications for proton exchange membrane fuel cell applications","volume":"362","author":"Simari","year":"2021","journal-title":"Solid State Ion."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"123746","DOI":"10.1016\/j.applthermaleng.2024.123746","article-title":"A recent overview of proton exchange membrane fuel cells: Fundamentals, applications, and advances","volume":"252","author":"Qasem","year":"2024","journal-title":"Appl. Therm. Eng."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Ng, W.W., Thiam, H.S., Pang, Y.L., Chong, K.C., and Lai, S.O. (2022). A State-of-Art on the Development of Nafion-Based Membrane for Performance Improvement in Direct Methanol Fuel Cells. Membranes, 12.","DOI":"10.3390\/membranes12050506"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1016\/j.jpowsour.2004.01.023","article-title":"Advanced materials for improved PEMFC performance and life","volume":"131","author":"Curtin","year":"2004","journal-title":"J. Power Sources"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1211","DOI":"10.1016\/j.jfluchem.2004.05.018","article-title":"Nafion\u00ae perfluorinated membranes in fuel cells","volume":"125","author":"Banerjee","year":"2004","journal-title":"J. Fluor. Chem."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"17628","DOI":"10.1021\/acsomega.0c02110","article-title":"Performance Comparison of Proton Exchange Membrane Fuel Cells with Nafion and Aquivion Perfluorosulfonic Acids with Different Equivalent Weights as the Electrode Binders","volume":"5","author":"Li","year":"2020","journal-title":"ACS Omega"},{"key":"ref_45","unstructured":"Research, P.M. (2025, November 22). Fuel Cell Market Size, Share, and Growth Forecast for 2025\u20132032. Available online: https:\/\/www.persistencemarketresearch.com\/market-research\/fuel-cells-market.asp."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2016","DOI":"10.1002\/cphc.201900191","article-title":"Non-Fluorinated Polymer Composite Proton Exchange Membranes for Fuel Cell Applications\u2014A Review","volume":"20","author":"Esmaeili","year":"2019","journal-title":"ChemPhysChem"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"264","DOI":"10.1016\/j.jpowsour.2012.11.126","article-title":"High temperature (HT) polymer electrolyte membrane fuel cells (PEMFC) e A review","volume":"231","author":"Chandan","year":"2013","journal-title":"J. Power Sources"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"104732","DOI":"10.1016\/j.reactfunctpolym.2020.104732","article-title":"Effect of sulfated metal oxides on the performance and stability of sulfonated poly (ether ether ketone) nanocomposite proton exchange membrane for fuel cell applications","volume":"156","author":"Sarirchi","year":"2020","journal-title":"React. Funct. Polym."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1189","DOI":"10.1021\/ma0523769","article-title":"Water stability of sulfonated polyimide membranes","volume":"39","author":"Yin","year":"2006","journal-title":"Macromolecules"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.jiec.2022.09.006","article-title":"Modified sulfonated polyphenylsulfone proton exchange membrane with enhanced fuel cell performance: A review","volume":"116","author":"Nor","year":"2022","journal-title":"J. Ind. Eng. Chem."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Selyanchyn, O., Selyanchyn, R., and Lyth, S.M. (2020). A Review of Proton Conductivity in Cellulosic Materials. Front. Energy Res., 8.","DOI":"10.3389\/fenrg.2020.596164"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"235833","DOI":"10.1016\/j.jpowsour.2024.235833","article-title":"Improved chemical durability in polymer electrolyte membranes with nanocellulose-based gas barrier interlayers","volume":"629","author":"Yang","year":"2025","journal-title":"J. Power Sources"},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Liu, Q., Li, Z., Wang, D., Li, Z., Peng, X., Liu, C., and Zheng, P. (2020). Metal Organic Frameworks Modified Proton Exchange Membranes for Fuel Cells. Front. Chem., 8.","DOI":"10.3389\/fchem.2020.00694"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1801146","DOI":"10.1002\/admi.201801146","article-title":"Proton Conductivity of Composite Polyelectrolyte Membranes with Metal-Organic Frameworks for Fuel Cell Applications","volume":"6","author":"Escorihuela","year":"2019","journal-title":"Adv. Mater. Interfaces"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"30401","DOI":"10.1039\/D3RA04855A","article-title":"Recent advancements of covalent organic frameworks (COFs) as proton conductors under anhydrous conditions for fuel cell applications","volume":"13","author":"Joseph","year":"2023","journal-title":"RSC Adv."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"236351","DOI":"10.1016\/j.jpowsour.2025.236351","article-title":"Triazine-rich covalent organic framework composited proton exchange membranes for flexible operating temperature and enhanced long-term stability fuel cells","volume":"632","author":"Ji","year":"2025","journal-title":"J. Power Sources"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"e202501116","DOI":"10.1002\/chem.202501116","article-title":"Recent Advances in the Application of Covalent Organic Framework\u2013Based Ionic Conductors in Proton Exchange Membrane Fuel Cells","volume":"31","author":"Lu","year":"2025","journal-title":"Chem.-Eur. J."},{"key":"ref_58","doi-asserted-by":"crossref","unstructured":"Alashkar, A., Al-Othman, A., Tawalbeh, M., and Qasim, M. (2022). A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells. Membranes, 12.","DOI":"10.3390\/membranes12020178"},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Ebrahimi, M., Kujawski, W., Fatyeyeva, K., and Kujawa, J. (2021). A review on ionic liquids-based membranes for middle and high temperature polymer electrolyte membrane fuel cells (Pem fcs). Int. J. Mol. Sci., 22.","DOI":"10.3390\/ijms22115430"},{"key":"ref_60","doi-asserted-by":"crossref","unstructured":"Ebrahimi, M., Fatyeyeva, K., and Kujawski, W. (2023). Different Approaches for the Preparation of Composite Ionic Liquid-Based Membranes for Proton Exchange Membrane Fuel Cell Applications\u2014Recent Advancements. Membranes, 13.","DOI":"10.3390\/membranes13060593"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"9745","DOI":"10.1021\/acs.jpcc.5b01067","article-title":"Ion dynamics and mechanical properties of sulfonated polybenzimidazole membranes for high-temperature proton exchange membrane fuel cells","volume":"119","author":"Nicotera","year":"2015","journal-title":"J. Phys. Chem. C"},{"key":"ref_62","doi-asserted-by":"crossref","unstructured":"Li, X., Ye, T., Meng, X., He, D., Li, L., Song, K., Jiang, J., and Sun, C. (2024). Advances in the Application of Sulfonated Poly(Ether Ether Ketone) (SPEEK) and Its Organic Composite Membranes for Proton Exchange Membrane Fuel Cells (PEMFCs). Polymers, 16.","DOI":"10.3390\/polym16192840"},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"19666","DOI":"10.1016\/j.ijhydene.2023.02.022","article-title":"Recent progress of catalyst ink for roll-to-roll manufacturing paired with slot die coating for proton exchange membrane fuel cells","volume":"48","author":"Liu","year":"2023","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"202","DOI":"10.1016\/j.apenergy.2018.02.001","article-title":"Fully printed and integrated electrolyzer cells with additive manufacturing for high-efficiency water splitting","volume":"215","author":"Yang","year":"2018","journal-title":"Appl. Energy"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"121915","DOI":"10.1016\/j.memsci.2023.121915","article-title":"Electrospun phosphonated poly(pentafluorostyrene) nanofibers as a reinforcement of Nafion membranes for fuel cell application","volume":"685","author":"Komma","year":"2023","journal-title":"J. Memb. Sci."},{"key":"ref_66","doi-asserted-by":"crossref","unstructured":"Lu, Z., and Yan, Y. (2024). Temperature Control of Fuel Cell Based on PEI-DDPG. Energies, 17.","DOI":"10.3390\/en17071728"},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"4356","DOI":"10.1016\/j.enpol.2008.09.036","article-title":"Hydrogen and fuel cells: Towards a sustainable energy future","volume":"36","author":"Edwards","year":"2008","journal-title":"Energy Policy"},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"3687","DOI":"10.1039\/D1SE00556A","article-title":"Hydrocarbon-based PemionTM proton exchange membrane fuel cells with state-of-the-art performance","volume":"5","author":"Nguyen","year":"2021","journal-title":"Sustain. Energy Fuels"},{"key":"ref_69","doi-asserted-by":"crossref","unstructured":"Lufrano, E., Simari, C., Enotiadis, A., and Nicotera, I. (2022). Sulfonated Polyether Ether Ketone and Organosilica Layered Nanofiller for Sustainable Proton Exchange Membranes Fuel Cells (PEMFCs). Appl. Sci., 12.","DOI":"10.3390\/app12030963"},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"47884","DOI":"10.1002\/app.47884","article-title":"Toward optimization of a robust low-cost sulfonated-polyethersulfone containing layered double hydroxide for PEM fuel cells","volume":"136","author":"Simari","year":"2019","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"2695","DOI":"10.1007\/s10570-019-02935-7","article-title":"Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO2 adsorption","volume":"27","author":"Wei","year":"2020","journal-title":"Cellulose"},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"74","DOI":"10.3390\/cleantechnol5010005","article-title":"Functional and Environmental Performances of Novel Electrolytic Membranes for PEM Fuel Cells: A Lab-Scale Case Study","volume":"5","author":"Arosio","year":"2023","journal-title":"Clean Technol."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"897","DOI":"10.1016\/j.rser.2015.07.157","article-title":"Approaches to polymer electrolyte membrane fuel cells (PEMFCs) and their cost","volume":"52","author":"Gervasio","year":"2015","journal-title":"Renew. Sustain. Energy Rev."},{"key":"ref_74","doi-asserted-by":"crossref","unstructured":"Madhav, D., Wang, J., Keloth, R., Mus, J., Buysschaert, F., and Vandeginste, V. (2024). A Review of Proton Exchange Membrane Degradation Pathways, Mechanisms, and Mitigation Strategies in a Fuel Cell. Energies, 17.","DOI":"10.3390\/en17050998"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"19841","DOI":"10.1039\/C4CP03329A","article-title":"Degradation mechanism of sulfonated poly (ether under vanadium flow battery medium","volume":"16","author":"Yuan","year":"2014","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"1437","DOI":"10.1002\/polb.22326","article-title":"Differences in Water Sorption and Proton Conductivity Between Nafion and SPEEK","volume":"49","author":"Wu","year":"2011","journal-title":"J. Polym. Sci. Part B Polym. Phys."},{"key":"ref_77","doi-asserted-by":"crossref","unstructured":"Wang, X., and Shi, B. (2025). Simultaneously Promoting Proton Conductivity and Mechanical Stability of SPEEK Membrane by Incorporating Porous g\u2014C3N4. Membranes, 15.","DOI":"10.3390\/membranes15070194"},{"key":"ref_78","doi-asserted-by":"crossref","unstructured":"Manoharan, Y., Hosseini, S.E., Butler, B., Alzhahrani, H., Senior, B.T.F., Ashuri, T., and Krohn, J. (2019). Hydrogen fuel cell vehicles; Current status and future prospect. Appl. Sci., 9.","DOI":"10.3390\/app9112296"},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"21672","DOI":"10.1039\/D4TA07085B","article-title":"Challenges and strategies for probing the composite interface of PEM electrolyzers and fuel cells using operando AP-XPS","volume":"13","author":"Hamlyn","year":"2025","journal-title":"J. Mater. Chem. A"},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1002\/fuce.200700053","article-title":"Review: Durability and degradation issues of PEM fuel cell components","volume":"8","author":"Dam","year":"2008","journal-title":"Fuel Cells"},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"1348","DOI":"10.3390\/polym16101348","article-title":"Evaluating the Durability of Perfluorosulfonic Acid Membranes Stability Testing","volume":"16","author":"Using","year":"2024","journal-title":"Polymers"},{"key":"ref_82","doi-asserted-by":"crossref","first-page":"3085","DOI":"10.1149\/2.0101806jes","article-title":"Membrane Accelerated Stress Test Development for Polymer Electrolyte Fuel Cell Durability Validated Using Field and Drive Cycle Testing","volume":"165","author":"Mukundan","year":"2018","journal-title":"J. Electrochem. Soc."},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1146\/annurev.matsci.33.022702.154657","article-title":"Non-Fluorinated Polymer Materials for Proton Exchange Membrane Fuel Cells","volume":"33","author":"Jones","year":"2003","journal-title":"Annu. Rev. Mater. Res."},{"key":"ref_84","doi-asserted-by":"crossref","first-page":"11236","DOI":"10.1039\/D4TA08823A","article-title":"Challenges and mitigation strategies for general failure and degradation in polymer electrolyte membrane-based fuel cells and electrolysers","volume":"13","author":"Arun","year":"2025","journal-title":"J. Mater. Chem. A"},{"key":"ref_85","doi-asserted-by":"crossref","unstructured":"Wang, W., and Alexandridis, P. (2016). Composite Polymer Electrolytes: Nanoparticles Affect Structure and Properties. Polymers, 8.","DOI":"10.3390\/polym8110387"},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"2306035","DOI":"10.1002\/advs.202306035","article-title":"Van Layered Double Hydroxides: Recent Progress and Promising Perspectives Toward Biomedical Applications","volume":"11","author":"Li","year":"2024","journal-title":"Adv. Sci."},{"key":"ref_87","doi-asserted-by":"crossref","first-page":"30618","DOI":"10.1039\/D4RA05134C","article-title":"Unveiling the potential of emergent nanoscale composite polymer electrolytes for safe and efficient all solid-state lithium-ion batteries","volume":"14","author":"Murali","year":"2024","journal-title":"RSC Adv."},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"14989","DOI":"10.1039\/C7RA00833C","article-title":"Growth behavior of water dispersed MgAl layered double hydroxide nanosheets","volume":"7","author":"Pang","year":"2017","journal-title":"RSC Adv."},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"3904","DOI":"10.1021\/cr050182l","article-title":"Scientific aspects of polymer electrolyte fuel cell durability and degradation","volume":"107","author":"Borup","year":"2007","journal-title":"Chem. Rev."},{"key":"ref_90","first-page":"101102","article-title":"Proton exchange membrane fuel cells: Advances in materials development, performance optimization, and future outlook","volume":"27","author":"Rimon","year":"2025","journal-title":"Energy Convers. Manag. X"},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"23248","DOI":"10.1039\/D5TA00028A","article-title":"Progress on polymer-based materials and composites for humidity sensor applications: From materials aspects to sensor performances","volume":"13","author":"Pasalwad","year":"2025","journal-title":"J. Mater. Chem. A"},{"key":"ref_92","unstructured":"Cells, P.E.M.F. (2010). DOE Cell Component Accelerated Stress Test."},{"key":"ref_93","doi-asserted-by":"crossref","unstructured":"Gottardo, G., Peressut, A.B., Colnago, S., Latorrata, S., Piegari, L., and Dotelli, G. (2023). LCA of a Proton Exchange Membrane Fuel Cell Electric Vehicle Considering Different Power System Architectures. Energies, 16.","DOI":"10.3390\/en16196782"},{"key":"ref_94","doi-asserted-by":"crossref","unstructured":"Khan, M.I., Shanableh, A., Shahida, S., Lashari, M.H., Manzoor, S., and Fernandez, J. (2022). SPEEK and SPPO Blended Membranes for Proton Exchange Membrane Fuel Cells. Membranes, 12.","DOI":"10.3390\/membranes12030263"}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/17\/23\/3185\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,2]],"date-time":"2025-12-02T15:36:35Z","timestamp":1764689795000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/17\/23\/3185"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,29]]},"references-count":94,"journal-issue":{"issue":"23","published-online":{"date-parts":[[2025,12]]}},"alternative-id":["polym17233185"],"URL":"https:\/\/doi.org\/10.3390\/polym17233185","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,11,29]]}}}