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Título: | Polypyrrole-derived mesoporous nitrogen-doped carbons with intrinsic catalytic activity in the oxygen reduction reaction |
Autor: | Sevilla Solís, Marta CSIC ORCID ; Yu, Linghui; Fellinger, Tim Patrick; Fuertes Arias, Antonio Benito CSIC ORCID ; Titirici, María-Magdalena | Fecha de publicación: | 16-abr-2013 | Editor: | Royal Society of Chemistry (UK) | Citación: | RSC Advances 3(25): 9904-9910 (2013) | Resumen: | [EN] N-doped mesoporous carbons containing small amounts of graphitic carbon have been successfully prepared using the nanocasting technique. Polypyrrole was used as N-dopant carbon precursor and SBA-15 or silica xerogel as templates. Graphitic carbon domains provide a good electronic conductivity of up to 0.33 S cm−1, a necessary property for electrochemical applications, while a mesoporous structure reduces mass transport limitations. These characteristics are further combined with a high N content (3.55–5.45 wt%). As a result, the as-prepared materials exhibit an enhanced intrinsic electrocatalytic activity towards the oxygen reduction reaction (ORR). They exhibit an onset potential of [similar]−90 to −70 mV vs. Ag/AgCl and a current density in the lower potential regime that exceeds that of a commercial platinum catalyst in a basic medium. Their behavior is superior to that of Vulcan XC72R carbon. Furthermore, unlike commercial Pt catalysts, they are unaffected by the methanol cross-over effect. It was found that the graphitic content must be well-balanced as, on the one hand, it enhances conductivity but, on the other hand, it selectively catalyses an unfavorable 2e− process. | Versión del editor: | http://pubs.rsc.org/en/content/articlehtml/2013/ra/c3ra41719k | URI: | http://hdl.handle.net/10261/89227 | DOI: | 10.1039/C3RA41719K | E-ISSN: | 2046-2069 |
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Polypyrrole-derived Mesoporous_Sevilla.pdf | 512,5 kB | Adobe PDF | Visualizar/Abrir |
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