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Local structure of Co doped RuO2 nanocrystalline electrocatalytic materials for chlorine and oxygen evolution

Paper ID Volume ID Publish Year Pages File Format Full-Text
54997 47036 2013 7 PDF Available
Title
Local structure of Co doped RuO2 nanocrystalline electrocatalytic materials for chlorine and oxygen evolution
Abstract

Nano-particulate Co doped ruthenium dioxide electrocatalysts of the general formula Ru1−xCoxO2−y (0 < x 0.3) were prepared by a co-precipitation method. The electrocatalysts with x < 0.2 conform to a single phase nano-crystalline materials. On the local level the Co forms clusters dispersed in the original rutile-like matrix. The local environment of the Co conforms to a rutile model which preserves the cationic arrangement but suppresses the probability of the Ru–Ru and Co–Co neighbors along the shortest metal–metal bonds. The electrocatalytic activity of the synthesized Ru1−xCoxO2-y materials in oxygen evolution is comparable with that of the non-doped ruthenium dioxide and little depends on the actual Co content. In presence of chlorides the Co doped materials are more selective towards oxygen evolution compared with the non doped ruthenia. The enhanced oxygen evolution in the case of Co doped electrocatalysts can be attributed to a chemical recombination of surface confined oxo-species. The selectivity shift towards oxygen evolution can be linked with limited activity of the Ru1−xCoxO2-y materials in the chlorine evolution reaction which seems to be relatively weakly dependent on the chloride concentration.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (174 K)Download as PowerPoint slideHighlights► Co doping forms pseudo-rutile Co rich inclusions. ► In presence of chlorides the oxygen gets evolved via EC mechanism. ► Heterostatic doping enhances oxygen evolution activity. ► Selectivity of the oxide is controlled by oxygen evolution catalysis.

Keywords
Oxygen evolution; Chlorine evolution; Oxide; EXAFS
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Local structure of Co doped RuO2 nanocrystalline electrocatalytic materials for chlorine and oxygen evolution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 202, 15 March 2013, Pages 63–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
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