Effect of secondary heteroatom (S, P) in N-doped reduced graphene oxide catalysts to oxygen reduction reaction
Heteroatomic dual-doped metal free graphene materials have revealed significant improvement in the electrocatalysis properties for oxygen reduction reaction (ORR) in alkaline anion exchange membrane fuel cells. Here we report a straightforward and cost-effective strategy to fabricate N, S- and N, P-...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/420783 |
| Acceso en línea: | http://hdl.handle.net/10261/420783 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099859837&doi=10.1016%2Fj.mcat.2020.111372&partnerID=40&md5=3f50ee046db77d49147f16cc5399c4b7 |
| Access Level: | acceso abierto |
| Palabra clave: | Dual-doped graphene Fuel cells Metal-free electrocatalyst Oxygen reduction reaction |
| Sumario: | Heteroatomic dual-doped metal free graphene materials have revealed significant improvement in the electrocatalysis properties for oxygen reduction reaction (ORR) in alkaline anion exchange membrane fuel cells. Here we report a straightforward and cost-effective strategy to fabricate N, S- and N, P- dual-doped reduced graphene oxide electrocatalysts, characterized by similar N/S and N/P ratios. For this purpose, we used ammonium sulfate ((NH<inf>4</inf>)<inf>2</inf>SO<inf>4</inf>) and ammonium monohydrogenphosphate ((NH<inf>4</inf>)<inf>2</inf>HPO<inf>4</inf>) as heteroatom precursors to obtain the desired catalysts by pyrolysis with graphene oxide. Systematic characterization reveals that the secondary heteroatom S has a greater promotional effect than P in ORR. Furthermore, the gap between the onset potentials of N, S- dual-doped graphene and the standard Pt/C is only 30 mV. The results imply that the combination of the N, S heteroatoms and the surface structure in dual-doped reduced graphene oxide lead to a synergistic effect in catalyzing ORR in alkaline media. © 2020 Elsevier B.V. |
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