Electrocatalytic Oxygen Reduction Reaction on 48-Tungsto-8-Phosphate Wheel Anchored on Carbon Nanomaterials
Regardless of great efforts, the development of novel low cost electrocatalysts with high electrocatalytic activity for the oxygen reduction reaction (ORR) remains a real challenge. This is a setback for the mass commercialization of one of the eco-friendliest alternative power sources: fuel cells (...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::49f530ac0162eff07c8456470318adf2 |
| Acceso en línea: | http://hdl.handle.net/10261/359855 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85142456972&doi=10.1007%2fs12678-022-00792-w&partnerID=40&md5=3b286bb32ace73d0d03138d66a4c2252 |
| Access Level: | acceso abierto |
| Palabra clave: | Carbon materials Electrocatalysis Oxygen reduction reaction Polyoxometalate |
| Sumario: | Regardless of great efforts, the development of novel low cost electrocatalysts with high electrocatalytic activity for the oxygen reduction reaction (ORR) remains a real challenge. This is a setback for the mass commercialization of one of the eco-friendliest alternative power sources: fuel cells (FCs). Thus, this work describes the preparation of four composites based on the 48-tungsto-8-phosphate polyanion salt K28Li5[H7P8W48O184]·92H2O (KLi-P8W48) immobilized on four distinct carbon materials, namely graphene flakes (GF), single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), and N-doped multi-walled carbon nanotubes (N-MWCNT), and their application as ORR electrocatalysts. In alkaline medium, all composites exhibited electrocatalytic activity with onset potentials between 0.71 and 0.94 V vs. RHE, while P8W48@N-MWCNT presented superior current density (−3.3 mA cm−2). A mixed electron process of 2- and 4-electrons is observed for all the composites, supporting the results of % H2O2 production. Additionally, low Tafel slopes were obtained (43–82 mV dec–1) for all composites. The electrocatalysts also showed excellent tolerance to methanol, with current retentions of 91–93%, and good electrochemical stability with current retentions between 67 and 82% after 36,000 s. |
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