Electrochemical activity towards ORR of mechanically alloyed PdCo supported on Vulcan carbon and carbon nanospheres

Autor:	Elsa M. Arce-Estrada, A. Ezeta-Mejía, C. M. Reza-San German, J.M. Mora-Hernández, S. Citalán-Cigarroa
Rok vydání:	2014
Předmět:	Materials science General Chemical Engineering Inorganic chemistry Intermetallic Energy-dispersive X-ray spectroscopy chemistry.chemical_element Electrocatalyst Electrochemistry Catalysis chemistry Materials Chemistry Atomic ratio Cyclic voltammetry Carbon
Zdroj:	Journal of Applied Electrochemistry. 44:1307-1315
ISSN:	1572-8838 0021-891X
DOI:	10.1007/s10800-014-0749-0
Popis:	A PdCo catalyst with an atomic ratio of 2:1 was synthesized from elemental powders by mechanical alloy- ing. The structural characterization and composition of the catalyst were determined by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. Both the electrocatalytic activity of the catalyst for oxygen reduction in acidic media, as well as attempts to support it on Vulcan XC-72 carbon powder and carbon nanospheres were evaluated by cyclic voltammetry, rotating disc elec- trode and rotating ring-disk electrode techniques. The X-ray diffraction studies indicated that an intermetallic PdCo compound with an average crystallite size of 25 nm was obtained. According to kinetic and thermodynamic parameters, the electrocatalytic activity of the catalyst toward oxygen reduction was determined as PdCo/ CNS ( PdCo/C with first-order kinetics, a four-electron multielectronic transference pathway, and a negligible amount of hydrogen peroxide produced. Activation energy values of 40 ± 1 kJ mol -1 and 68 ± 1 kJ mol -1 were
Databáze:	OpenAIRE
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