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

Paper ID Volume ID Publish Year Pages File Format Full-Text
41919 45904 2010 9 PDF Available
Title
Synthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction
Abstract

Crystalline CoSe2, with the pyrite structure, supported on carbon powder has been synthesized by a wet chemical method. Samples were characterized by a range of techniques, including X-ray diffraction and transmission electron microscopy for structure, and X-ray photoelectron spectroscopy and scanning Auger microscopy (SAM) for surface composition. Electrochemical 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 reduction reaction (ORR), and the surface analysis methods were used to identify changes in surface composition. Comparisons of ORR activities were made with CoSe and Pt powder catalysts prepared by comparable methods. Stationary cyclic voltammetry was used to assess the stability of the as-prepared CoSe2 powder catalyst in an acidic electrochemical environment. A preliminary investigation was also made of an electrochemical 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 observed passivation to a thin layer of Se formed by the modification treatment.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (57 K)Download as PowerPoint slideResearch highlights▶ Catalytic activity of CoSe2 with pyrite structure was demonstrated for ORR. ▶ Effects of electrochemical environment on surface composition were characterized. ▶ CoSe2 is more active for ORR than samples based on CoSe.

Keywords
CoSe2 catalyst; Oxygen reduction reaction; Materials characterization; Surface characterization; Electrochemical surface modification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 386, Issues 1–2, 30 September 2010, Pages 157–165
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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