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Synthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction.

TitleSynthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction.
Publication TypeJournal Article
Year of Publication2010
AuthorsZhu, L, Teo, M, Wong, PC, Wong, KC, Narita, I, Ernst, F, Mitchell, KAR, Campbell, SA
JournalApplied Catalysis, A: General
Volume386
Pagination157 - 165
Date Published2010///
ISBN Number0926-860X
Keywordscobalt selenide synthesis characterization catalyst oxygen redn reaction
Abstract

Cryst. CoSe2, with the pyrite structure, supported on carbon powder has been synthesized by a wet chem. method. Samples were characterized by a range of techniques, including X-ray diffraction and transmission electron microscopy for structure, and XPS and scanning Auger microscopy (SAM) for surface compn. Electrochem. dynamic polarization measurements were carried out using the CoSe2-decorated carbon powder as part of a rotating disk electrode to assess its catalytic activity for the oxygen redn. reaction (ORR), and the surface anal. methods were used to identify changes in surface compn. Comparisons of ORR activities were made with CoSe and Pt powder catalysts prepd. by comparable methods. Stationary cyclic voltammetry was used to assess the stability of the as-prepd. CoSe2 powder catalyst in an acidic electrochem. environment. A preliminary investigation was also made of an electrochem. modification treatment for CoSe2. The surface formed was characterized by the rotating ring-disk electrode technique and by micro-Raman spectroscopy, backscattered-electron imaging and SAM. The latter combination of characterization techniques helped to relate an obsd. passivation to a thin layer of Se formed by the modification treatment. [on SciFinder(R)]