{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T17:32:23Z","timestamp":1780507943033,"version":"3.54.1"},"reference-count":51,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,20]],"date-time":"2022-01-20T00:00:00Z","timestamp":1642636800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100011698","name":"Regional Government of Castile-La Mancha","doi-asserted-by":"publisher","award":["SBPLY\/17\/180501\/000330\u201d."],"award-info":[{"award-number":["SBPLY\/17\/180501\/000330\u201d."]}],"id":[{"id":"10.13039\/501100011698","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Membranes"],"abstract":"<jats:p>In this work, polybenzimidazole (PBI) membranes with different graphene oxide (GO) contents (0.5, 1.0, 2.0, and 3.0 wt %) as organic filler have been prepared. The X-ray diffraction confirms the incorporation of the filler into the polymeric membrane. The composite GO-based PBI membranes show better proton conductivity at high temperature (110\u2013170 \u00b0C) than the pristine one. Moreover, the hydrophobicity of the PBI membranes is also improved, enhancing water management. The chemical stability demonstrates the benefit of the incorporation of GO in the PBI matrix. What is more, the composite PBI-based membranes show better phosphoric acid retention capability. For the first time, the results of the SO2-depolarized electrolysis for hydrogen production at high temperature (130 \u00b0C) using phosphoric acid-doped polybenzimidazole (PBI) membranes with the different GO contents are shown. The benefit of the organic filler is demonstrated, as H2SO4 production is 1.5 times higher when the membrane with a content of 1 wt % of GO is used. Moreover, three times more hydrogen is produced with the membrane containing 2 wt % of GO compared with the non-modified membrane. The obtained results are very promising and provide open research for this kind of composite membranes for green hydrogen production by the Westinghouse cycle.<\/jats:p>","DOI":"10.3390\/membranes12020116","type":"journal-article","created":{"date-parts":[[2022,1,20]],"date-time":"2022-01-20T22:51:06Z","timestamp":1642719066000},"page":"116","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Characterization of PBI\/Graphene Oxide Composite Membranes for the SO2 Depolarized Electrolysis at High Temperature"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5141-3655","authenticated-orcid":false,"given":"Sergio","family":"Diaz-Abad","sequence":"first","affiliation":[{"name":"Chemical Engineering Department, Enrique Costa Building, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071 Ciudad Real, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"Fern\u00e1ndez-Mancebo","sequence":"additional","affiliation":[{"name":"Chemical Engineering Department, Enrique Costa Building, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071 Ciudad Real, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2518-8436","authenticated-orcid":false,"given":"Manuel A.","family":"Rodrigo","sequence":"additional","affiliation":[{"name":"Chemical Engineering Department, Enrique Costa Building, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071 Ciudad Real, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2824-8799","authenticated-orcid":false,"given":"Justo","family":"Lobato","sequence":"additional","affiliation":[{"name":"Chemical Engineering Department, Enrique Costa Building, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071 Ciudad Real, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,20]]},"reference":[{"key":"ref_1","unstructured":"Fuel Cells and Hydrogen Joint Undertaking (FCH) (2019). Hydrogen Roadmap Europe, Fuel Cells and Hydrogen Joint Undertaking (FCH)."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/j.jechem.2020.03.087","article-title":"Decarbonising energy: The developing international activity in hydrogen technologies and fuel cells","volume":"51","author":"Edwards","year":"2020","journal-title":"J. Energy Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"4482","DOI":"10.1016\/j.ijhydene.2008.08.056","article-title":"Development of membrane reformer system for highly efficient hydrogen production from natural gas","volume":"34","author":"Shirasaki","year":"2009","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"118642","DOI":"10.1016\/j.memsci.2020.118642","article-title":"H2SO4-doped polybenzimidazole membranes for hydrogen production with acid-alkaline amphoteric water electrolysis","volume":"618","author":"Wan","year":"2021","journal-title":"J. Membr. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1039\/B808138G","article-title":"Hydrogen production from renewable sources: Biomass and photocatalytic opportunities","volume":"2","author":"Navarro","year":"2009","journal-title":"Energy Environ. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"11951","DOI":"10.1039\/C8TA03027H","article-title":"Aluminum-incorporated p-CuO\/n-ZnO photocathode coated with nanocrystal-engineered TiO2 protective layer for photoelectrochemical water splitting and hydrogen generation","volume":"6","author":"Eugene","year":"2018","journal-title":"J. Mater. Chem. A"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.solener.2017.05.060","article-title":"Solar hydrogen production via sulphur based thermochemical water-splitting","volume":"156","author":"Sattler","year":"2017","journal-title":"Solar Energy"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1639","DOI":"10.1016\/j.ijhydene.2014.11.118","article-title":"Solar Hydrogen production via thermochemical iron oxide-iron sulfate water splitting cycle","volume":"40","author":"Bhosale","year":"2014","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"12725","DOI":"10.1016\/j.ijhydene.2011.07.033","article-title":"Hybrid sulfur cycle flowsheets for hydrogen production using high-temperature gas-cooled reactors","volume":"36","author":"Gorensek","year":"2011","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"D\u00edaz-Abad, S., Mill\u00e1n, M., Rodrigo, M.A., and Lobato, J. (2019). Review of anodic catalysts for SO2 depolarized electrolysis for \u201cGreen Hydrogen\u201d production. Catalysts, 9.","DOI":"10.3390\/catal9010063"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1016\/0360-3199(77)90062-3","article-title":"Process sensitivity studies of the westinghouse sulfur cycle for hydrogen generation","volume":"2","author":"Carty","year":"1977","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"7919","DOI":"10.1016\/j.ijhydene.2009.07.075","article-title":"SO2 Permeability and proton conductivity of SPEEK membranes for SO2-depolarized electrolyzer","volume":"34","author":"Kim","year":"2009","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"B952","DOI":"10.1149\/1.3397901","article-title":"Quantifying individual potential contributions of the hybrid sulfur electrolyzer","volume":"157","author":"Staser","year":"2010","journal-title":"J. Electrochem. Soc."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"F44","DOI":"10.1149\/2.010206eel","article-title":"Polybenzimidazole membranes for hydrogen and sulfuric acid production in the hybrid sulfur electrolyzer","volume":"1","author":"Jayakumar","year":"2012","journal-title":"ECS Electrochem. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"25672","DOI":"10.1016\/j.ijhydene.2019.10.154","article-title":"Synthesis and characterization of pt on novel catalyst supports for the H2 production in the westinghouse cycle","volume":"45","author":"Lobato","year":"2019","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1016\/j.memsci.2010.07.024","article-title":"Pervaporation dehydration of ethylene glycol through polybenzimidazole (PBI)-Based Membranes. 1. Membrane fabrication","volume":"363","author":"Wang","year":"2010","journal-title":"J. Membr. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"449","DOI":"10.1016\/j.progpolymsci.2008.12.003","article-title":"High temperature proton exchange membranes based on polybenzimidazoles for fuel cells","volume":"34","author":"Li","year":"2009","journal-title":"Progress Polym. Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"20939","DOI":"10.1016\/j.ijhydene.2017.06.241","article-title":"Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual Design","volume":"42","author":"Gorensek","year":"2017","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Li, Q., Aili, D., Hjuler, H.A., and Jensen, J.O. (2016). PBI-Based Composite Membranes BT\u2014High Temperature Polymer Electrolyte Membrane Fuel cells: Approaches, Status, and Perspectives, Springer International Publishing.","DOI":"10.1007\/978-3-319-17082-4"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"346","DOI":"10.1007\/s10965-019-1923-1","article-title":"High-temperature PEMs based on polybenzimidazole and new nanoparticles for fuel cell application","volume":"27","author":"Artimani","year":"2020","journal-title":"J. Polym. Res."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1853","DOI":"10.1007\/s11581-019-03423-5","article-title":"Hybrid Membranes based on polybenzimidazoles and silica with imidazoline-functionalized surface, candidates for fuel cells applications","volume":"26","author":"Lysova","year":"2020","journal-title":"Ionics"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1007\/s12034-020-02187-3","article-title":"Enhanced electrical, mechanical and thermal properties of chemically modified graphene-reinforced polybenzimidazole nanocomposites","volume":"43","author":"Dey","year":"2020","journal-title":"Bull. Mater. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"86","DOI":"10.1016\/j.jpowsour.2018.12.020","article-title":"Graphene oxide synthesis using microwave-assisted vs. modified Hummer\u2019s methods: Efficient fillers for improved ionic conductivity and suppressed methanol permeability in alkaline methanol fuel cell electrolytes","volume":"414","author":"Chang","year":"2019","journal-title":"J. Power Sour."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"12254","DOI":"10.1016\/j.ijhydene.2020.02.193","article-title":"Polybenzimidazole composite membranes containing imidazole functionalized graphene oxide showing high proton conductivity and improved physicochemical properties","volume":"46","author":"Kim","year":"2021","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Rambabu, G., Bhat, S.D., and Figueiredo, F.M.L. (2019). Carbon nanocomposite membrane electrolytes for direct methanol fuel cells\u2014A concise review. Nanomaterials, 9.","DOI":"10.3390\/nano9091292"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"6739","DOI":"10.1021\/nn500504s","article-title":"Bin Poly(Vinyl Alcohol) reinforced and toughened with poly(dopamine)-treated graphene oxide, and its use for humidity sensing","volume":"8","author":"Hwang","year":"2014","journal-title":"ACS Nano"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"10524","DOI":"10.1016\/j.matpr.2017.12.384","article-title":"Novel cross-linked PBI-blended membranes evaluated for high temperature fuel cell application and SO2 electrolysis","volume":"5","author":"Peach","year":"2018","journal-title":"Mater. Today Proc."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.ijhydene.2013.10.023","article-title":"Comparison of ionically and ionical-covalently cross-linked polyaromatic membranes for SO2 electrolysis","volume":"39","author":"Peach","year":"2014","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1016\/j.memsci.2006.01.049","article-title":"Synthesis and characterisation of poly[2,2-(m-phenylene)-5,5-bibenzimidazole] as polymer electrolyte membrane for high temperature PEMFCs","volume":"280","author":"Lobato","year":"2006","journal-title":"J. Membr. Sci."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1016\/j.memsci.2007.08.028","article-title":"Improved polybenzimidazole films for H3PO4-doped PBI-based high temperature PEMFC","volume":"306","author":"Lobato","year":"2007","journal-title":"J. Membr. Sci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"2636","DOI":"10.1016\/j.ijhydene.2016.07.009","article-title":"Development of polybenzimidazole\/graphene oxide composite membranes for high temperature PEM fuel cells","volume":"42","author":"Devrim","year":"2017","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"127083","DOI":"10.1016\/j.cej.2020.127083","article-title":"A Review of the recent advances on the treatment of Industrial Wastewaters by sulfate radical-based advanced oxidation processes (SR-AOPs)","volume":"406","author":"Giannakis","year":"2021","journal-title":"Chem. Eng. J."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/j.coco.2019.11.012","article-title":"Enhancing electrical, mechanical, and thermal properties of polybenzimidazole by 3D carbon nanotube@graphene oxide hybrid","volume":"17","author":"Dey","year":"2020","journal-title":"Compos. Commun."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"867","DOI":"10.1021\/jz300236w","article-title":"Understanding aqueous dispersibility of graphene oxide and reduced graphene oxide through p K a measurements","volume":"3","author":"Konkena","year":"2012","journal-title":"J. Phys. Chem. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1002\/fuce.200400020","article-title":"PBI-based polymer membranes for high temperature fuel cells\u2014Preparation, characterization and fuel cell demonstration","volume":"4","author":"Li","year":"2004","journal-title":"Fuel Cells"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/S0376-7388(01)00359-3","article-title":"Sulfonated polybenzimidazole membranes\u2014Preparation and physico-chemical characterization","volume":"188","author":"Staiti","year":"2001","journal-title":"J. Membr. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"3161","DOI":"10.1021\/acsapm.0c00350","article-title":"Cross-linked polybenzimidazole membrane for PEM fuel cells","volume":"2","author":"Harilal","year":"2020","journal-title":"ACS Appl. Polym. Mater."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.arabjc.2010.08.022","article-title":"Carbon nanotubes, science and technology part (I) structure, synthesis and characterisation","volume":"5","author":"Aqel","year":"2012","journal-title":"Arabian J. Chem."},{"key":"ref_39","first-page":"155","article-title":"Oxidation of multi-walled carbon nanotubes in acidic and basic piranha mixture","volume":"2","author":"Abdulrazzak","year":"2016","journal-title":"Front. Nanosci. Nanotechnol."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"118007","DOI":"10.1016\/j.memsci.2020.118007","article-title":"Oil-in-water separation with graphene-based nanocomposite membranes for produced water treatment","volume":"603","author":"Alammar","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"5256","DOI":"10.1021\/am301185b","article-title":"Proton exchange membrane developed from novel blends of polybenzimidazole and poly(vinyl-1,2,4-triazole)","volume":"4","author":"Hazarika","year":"2012","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1564","DOI":"10.1016\/j.eurpolymj.2013.01.028","article-title":"Novel proton exchange membrane for fuel cell developed from blends of polybenzimidazole with fluorinated polymer","volume":"49","author":"Hazarika","year":"2013","journal-title":"Eur. Polym. J."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"13645","DOI":"10.1016\/j.ijhydene.2012.02.054","article-title":"Membrane electrode assemblies doped with H3PO4 for high temperature proton exchange membrane fuel cells","volume":"37","author":"Tseng","year":"2012","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"1655","DOI":"10.1007\/s10008-016-3169-8","article-title":"SO2 Carry-over and sulphur formation in a SO2-depolarized electrolyser","volume":"20","author":"Virtanen","year":"2016","journal-title":"J. Solid State Electrochem."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"1403","DOI":"10.1021\/ed100468u","article-title":"Contact angle measurements using a simplified experimental setup","volume":"87","author":"Lamour","year":"2010","journal-title":"J. Chem. Educ."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1016\/j.apsusc.2014.10.148","article-title":"Hydrophobic cotton textile surfaces using an amphiphilic graphene oxide (GO) coating","volume":"324","author":"Tissera","year":"2015","journal-title":"Appl. Surf. Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"118364","DOI":"10.1016\/j.memsci.2020.118364","article-title":"Roughness-enhanced hydrophobic graphene oxide membrane for water desalination via membrane distillation","volume":"611","author":"Mao","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"A8","DOI":"10.1149\/1.1630037","article-title":"Conductivity of PBI membranes for high-temperature polymer electrolyte fuel cells","volume":"151","author":"Ma","year":"2004","journal-title":"J. Electrochem. Soc."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"5444","DOI":"10.1039\/c2jm14774b","article-title":"Thermal curing of PBI membranes for high temperature PEM fuel cells","volume":"22","author":"Aili","year":"2012","journal-title":"J. Mater. Chem."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"1537","DOI":"10.1016\/j.ijhydene.2009.12.046","article-title":"Hybrid sulfur cycle for H2 production: A sensitivity study of the electrolysis step in a filter-press cell","volume":"35","author":"Charton","year":"2010","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"13281","DOI":"10.1016\/j.ijhydene.2015.08.041","article-title":"Development and testing of a PEM SO2-depolarized electrolyzer and an operating method that prevents sulfur accumulation","volume":"40","author":"Steimke","year":"2015","journal-title":"Int. J. Hydrogen Energy"}],"container-title":["Membranes"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0375\/12\/2\/116\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T22:04:20Z","timestamp":1760133860000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0375\/12\/2\/116"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,1,20]]},"references-count":51,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2022,2]]}},"alternative-id":["membranes12020116"],"URL":"https:\/\/doi.org\/10.3390\/membranes12020116","relation":{},"ISSN":["2077-0375"],"issn-type":[{"value":"2077-0375","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,1,20]]}}}