In situ electrochemical stress measurements examining the oxygen evolution reaction in basic electrolytes

Thao T.H. Hoang, Yair Cohen, Andrew A Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

In situ electrochemical stress measurements are used to interrogate changes in oxide structure before and during the oxygen evolution reaction (OER) from Ir, Ni, Co, Au, and Pt electrodes in alkaline electrolyte. Stress evolution during potential cycling reports on changes in oxidation state and oxide forms. Hysteresis observed in the potential-dependent stress from Ir, Au, and Pt electrodes is associated with chemical irreversibility in electrode composition and roughness. Alternatively, Ni and Co exhibit reversible conversion between hydroxide and oxyhydroxide forms during cycling. From the experimentally determined stress, charge passed during electrode oxidation, and Young's modulus, the change in strain exhibited by Ni and Co electrodes during hydroxide-oxyhydroxide conversion is calculated to be 7.0% and 8.4%, respectively. We also show that the magnitude of change in stress is proportional to the amount of material that is further oxidized.

Original languageEnglish (US)
Pages (from-to)11290-11297
Number of pages8
JournalAnalytical chemistry
Volume86
Issue number22
DOIs
StatePublished - Nov 18 2014

ASJC Scopus subject areas

  • Analytical Chemistry

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