Effects of aqueous buffers on electrocatalytic water oxidation with an iridium oxide material electrodeposited in thin layers from an organometallic precursor

Maxwell N. Kushner-Lenhoff, James D. Blakemore, Nathan D. Schley, Robert H. Crabtree, Gary W. Brudvig

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22 Citations (Scopus)

Abstract

A thin layer of an amorphous, mixed-valence iridium oxide (electrodeposited from an organometallic precursor, [Cp*Ir(H2O) 3]2+) is a heterogeneous catalyst among the most active and stable currently available for electrochemical water oxidation. We show that buffers can improve the oxygen-evolution activity of such thin-layer catalysts near neutral pH, but that buffer identity and concentration, as well as the solution pH, remain key determinants of long-term electrocatalyst activity and stability; for example, phosphate buffer can reduce the overpotential by up to 173 mV.

Original languageEnglish
Pages (from-to)3617-3622
Number of pages6
JournalDalton Transactions
Volume42
Issue number10
DOIs
Publication statusPublished - Mar 14 2013

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ASJC Scopus subject areas

  • Inorganic Chemistry

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