Enhanced electro-oxidation resistance of carbon electrodes induced by phosphorus surface groups

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Title: Enhanced electro-oxidation resistance of carbon electrodes induced by phosphorus surface groups
Authors: Berenguer Betrián, Raúl | Ruiz-Rosas, Ramiro | Gallardo, Aurora | Cazorla-Amorós, Diego | Morallon, Emilia | Nishihara, Hirotomo | Kyotani, Takashi | Rodríguez-Mirasol, José | Cordero, Tomás
Research Group/s: Materiales Carbonosos y Medio Ambiente | Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Electro-oxidation | Carbon electrodes | Phosphorus surface groups
Knowledge Area: Química Física | Química Inorgánica
Issue Date: Dec-2015
Publisher: Elsevier
Citation: Carbon. 2015, 95: 681-689. doi:10.1016/j.carbon.2015.08.101
Abstract: The electro-oxidation of carbon materials enormously degrades their performance and limits their wider utilization in multiple electrochemical applications. In this work, the positive influence of phosphorus functionalities on the overall electrochemical stability of carbon materials has been demonstrated under different conditions. We show that the extent and selectivity of electroxidation in P-containing carbons are completely different to those observed in conventional carbons without P. The electro-oxidation of P-containing carbons involves the active participation of phosphorus surface groups, which are gradually transformed at high potentials from less-to more-oxidized species to slow down the introduction of oxygen groups on the carbon surface (oxidation) and the subsequent generation of (C*OOH)-like unstable promoters of electro-gasification. The highest-oxidized P groups (–C–O–P-like species) seem to distribute the gained oxygen to neighboring carbon sites, which finally suffer oxidation and/or gasification. So it is thought that P-groups could act as mediators of carbon oxidation although including various steps and intermediates compared to electroxidation in P-free materials.
Sponsor: Financial support by the Spanish Ministerio de Economía y Competitividad, for the MAT2013-42007-P, P09-FQM-5156R, CTQ2012-36408, JCI2011-10566, JCI-2012-12664 and the Joint Spanish-Japanese (PRI-PIBJP-2011-0766) projects, FEDER and the Junta de Andalucía are gratefully acknowledged.
URI: http://hdl.handle.net/10045/49369
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2015.08.101
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.carbon.2015.08.101
Appears in Collections:INV - GEPE - Artículos de Revistas
INV - MCMA - Artículos de Revistas

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