Chemical and electrochemical characterization of porous carbon materials

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Títol: Chemical and electrochemical characterization of porous carbon materials
Autors: Bleda Martínez, María Jesús | Lozano Castelló, Dolores | Morallon, Emilia | Cazorla-Amorós, Diego | Linares-Solano, Angel
Grups d'investigació o GITE: Electrocatálisis y Electroquímica de Polímeros
Centre, Departament o Servei: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Química Física
Paraules clau: Activated carbon | Chemical treatment | Temperature programmed desorption | Electrochemical properties | Surface oxigen complexes
Àrees de coneixement: Química Física | Ciencia de Materiales
Data de creació: 11-d’abril-2006
Data de publicació: 19-de maig-2006
Editor: Elsevier
Citació bibliogràfica: BLEDA MARTÍNEZ, María Jesús, et al. "Chemical and electrochemical characterization of porous carbon materials". Carbon. Vol. 44, Issue 13 (Nov. 2006). ISSN 0008-6223, pp. 2642-2651
Resum: Chemical and electrochemical techniques have been used in order to asses surface functionalities of porous carbon materials. An anthracite has been chemically activated using both KOH and NaOH as activating agents. As a result, activated carbons with high micropore volume (higher than 1 cm3/g) have been obtained. These samples were oxidized with HNO3 and thermally treated in N2 flow at different temperatures in order to obtain porous carbon materials with different amounts of surface oxygen complexes. Thermal treatment in H2 was also carried out. The sample treated with H2 was subsequently treated in air flow at 450 ºC. Thus, materials with very similar porous texture and widely different surface chemistry have been compared. The surface chemistry of the resulting materials was systematically characterized by TPD experiments and XPS measurements. Galvanostatic and voltammetric techniques were used to deepen into the characterization of the surface oxygen complexes. The combination of both, chemical and electrochemical methods provide unique information, regarding the key role of surface chemistry in improving carbon wettability in aqueous solution and the redox processes undergone by the surface oxygen groups. Both contributions are of relevance to understand the use of porous carbons as electrochemical capacitors.
Patrocinadors: Ministerio de Ciencia y Tecnología (PPQ2003-03884).
URI: http://hdl.handle.net/10045/7765
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2006.04.017
Idioma: eng
Tipus: info:eu-repo/semantics/article
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1016/j.carbon.2006.04.017
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