Crystalline nickel manganese antimonate as a stable water-oxidation catalyst in aqueous 1.0 M H2SO4

Ivan A. Moreno-Hernandez, Clara A. Macfarland, Carlos G. Read, Kimberly M. Papadantonakis, Bruce S. Brunschwig, Nathan S Lewis

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Abstract

Water oxidation is a required half-reaction for electrochemical water splitting. To date, the only well-established active oxygen-evolution catalysts stable under operating conditions and at rest in acidic aqueous media contain Ru or Ir, two of the scarcest non-radioactive elements on Earth. We report herein a nickel-manganese antimonate electrocatalyst with a rutile-type crystal structure that requires an initial voltammetric overpotential of 672 ± 9 mV to catalyze the oxidation of water to O2(g) at a rate corresponding to 10 mA cm-2 of current density when operated in contact with 1.0 M sulfuric acid. Under galvanostatic control, the overpotential initially rose from 670 mV but was then stable at 735 ± 10 mV for 168 h of continuous operation at 10 mA cm-2. We additionally provide an in-depth evaluation of the stability of the nickel-manganese antimonate electrocatalyst, including elemental characterization of the surface, bulk, and electrolyte before and after electrochemical operation.

Original languageEnglish
Pages (from-to)2103-2108
Number of pages6
JournalEnergy and Environmental Science
Volume10
Issue number10
DOIs
Publication statusPublished - Oct 1 2017

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ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Moreno-Hernandez, I. A., Macfarland, C. A., Read, C. G., Papadantonakis, K. M., Brunschwig, B. S., & Lewis, N. S. (2017). Crystalline nickel manganese antimonate as a stable water-oxidation catalyst in aqueous 1.0 M H2SO4 Energy and Environmental Science, 10(10), 2103-2108. https://doi.org/10.1039/c7ee01486d