Oxygen Evolution on Tantalum-Polypyrrole-Platinum Anodes

Gerald Cooper, Rommel Noufi, Arthur J. Frank, Arthur J. Nozik

Research output: Contribution to journalArticlepeer-review

26 Scopus Citations

Abstract

Electrically conducting polymer films of polypyrrole were previously reported1-6 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 O2 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 O2 evolution from aqueous solution. We found that polypyrrole is stable in the presence of O2; that while polypyrrole itself is a poor electrocatalyst for O2 evolution, metal catalysts can be deposited on its surface to enhance O 2 evolution; and that Ta-polypyrrole-Pt electrode structures are electrochemically indistinguishable from naked Pt electrodes with respect to O2 evolution.

Original languageAmerican English
Pages (from-to)578-580
Number of pages3
JournalNature
Volume295
Issue number5850
DOIs
StatePublished - 1982

NREL Publication Number

  • ACNR/JA-236-4424

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