{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T10:01:00Z","timestamp":1766138460438,"version":"build-2065373602"},"reference-count":97,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2023,9,29]],"date-time":"2023-09-29T00:00:00Z","timestamp":1695945600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"FEEI through Programa operacional Competitividade e Internacionalizac\u0327\u00e3o-COMPETE2020","doi-asserted-by":"publisher","award":["UNIRCELL POCI-01-0145-FEDER-16422"],"award-info":[{"award-number":["UNIRCELL POCI-01-0145-FEDER-16422"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"FCT\u2014Fundac\u0327\u00e3o para a Ci\u00eancia e a Tecnologia, I.P.","award":["UNIRCELL POCI-01-0145-FEDER-16422"],"award-info":[{"award-number":["UNIRCELL POCI-01-0145-FEDER-16422"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Inorganics"],"abstract":"<jats:p>The oxygen reduction reaction (ORR) is a key cathodic reaction in energy-converting systems, such as fuel cells (FCs). Thus, it is of utmost importance to develop cost-effective and efficient electrocatalysts (ECs) without noble metals to substitute the Pt-based ones. This study focuses on polyoxometalate (POM)-based ECs for ORR applications. A Wells\u2013Dawson POM salt K7 [P2W17(FeOH2)O61].\u00b720H2O was immobilised onto graphene flakes and multiwalled carbon nanotubes doped with nitrogen, denominated as P2W17Fe@GF_N8 and P2W17Fe@MWCNT_N8. The successful preparation of the composites was proved with various characterisation techniques, including FTIR, XPS and SEM. Both materials showed good ORR performance in an alkaline medium with similar potential onset values of ~0.84 V vs. RHE and diffusion-limiting current densities of \u22123.9 and \u22123.3 mA cm\u22122 for P2W17Fe@MWCNT_N8 and P2W17Fe@GF_N8, respectively. Furthermore, both composites presented low Tafel slopes (48\u201358 mV dec\u22121). Chronoamperometric tests revealed that the as-prepared nanocomposites rendered a significant improvement achieving between 90 and 94% of current retention in tolerance to methanol in comparison with Pt\/C, and moderate to good long-term electrochemical stability with current retentions comprised between 68 and 88%. This work reinforces the use of POMs as important electroactive species for the preparation of alternative ORR electrocatalysts, exhibiting good activity, stability and selectivity towards the ORR in the presence of methanol.<\/jats:p>","DOI":"10.3390\/inorganics11100388","type":"journal-article","created":{"date-parts":[[2023,9,29]],"date-time":"2023-09-29T07:42:08Z","timestamp":1695973328000},"page":"388","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Hybrids Composed of an Fe-Containing Wells\u2013Dawson Polyoxometalate and Carbon Nanomaterials as Promising Electrocatalysts for the Oxygen Reduction Reaction"],"prefix":"10.3390","volume":"11","author":[{"given":"Hugo C.","family":"Novais","sequence":"first","affiliation":[{"name":"LAQV-REQUIMTE\/Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal"}]},{"given":"Bruno","family":"Jarrais","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE\/Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal"}]},{"given":"Isra\u00ebl-Martyr","family":"Mbomekall\u00e9","sequence":"additional","affiliation":[{"name":"Equipe d\u2019Electrochimie et de Photo-\u00c9lectrochimie, Institut de Chimie Physique, UMR 8000 CNRS, Facult\u00e9 des Sciences d\u2019Orsay, Universit\u00e9 Paris-Saclay, F-91405 Orsay, France"}]},{"given":"Anne-Lucie","family":"Teillout","sequence":"additional","affiliation":[{"name":"Equipe d\u2019Electrochimie et de Photo-\u00c9lectrochimie, Institut de Chimie Physique, UMR 8000 CNRS, Facult\u00e9 des Sciences d\u2019Orsay, Universit\u00e9 Paris-Saclay, F-91405 Orsay, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4823-4143","authenticated-orcid":false,"given":"Pedro de","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Equipe d\u2019Electrochimie et de Photo-\u00c9lectrochimie, Institut de Chimie Physique, UMR 8000 CNRS, Facult\u00e9 des Sciences d\u2019Orsay, Universit\u00e9 Paris-Saclay, F-91405 Orsay, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1753-8678","authenticated-orcid":false,"given":"Cristina","family":"Freire","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE\/Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5263-2737","authenticated-orcid":false,"given":"Diana M.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE\/Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Perera, F. 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