Oxygen evolution on tantalum-polypyrrole-platinum anodes
Nature, ISSN: 0028-0836, Vol: 295, Issue: 5850, Page: 578-580
1982
- 30Citations
- 13Captures
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Article Description
Electrically conducting polymer films of polypyrrole were previously reported to provide greatly enhanced stability against the photodegradation of semiconductor photoanodes in electrochemical photovoltaic cells. To determine the feasibility of protecting photoanodes with polypyrrole in photoelectrolysis cells where O is evolved some basic questions had to be answered. To achieve this we have performed experiments using polypyrrole films as protective coatings on Ta metal electrodes; Ta is known to form insulating oxides that prevent O evolution from aqueous solution. We found that polypyrrole is stable in the presence of O; that while polypyrrole itself is a poor electrocatalyst for O evolution, metal catalysts can be deposited on its surface to enhance O evolution; and that Ta-polypyrrole-Pt electrode structures are electrochemically indistinguishable from naked Pt electrodes with respect to O evolution. © 1982 Nature Publishing Group.
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