期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 10, 期 10, 页码 2103-2108出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee01486d
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资金
- Office of Science of the U.S. Department of Energy (DOE) [DE-SC0004993]
- National Science Foundation [DGE-1144469]
- Gordon and Betty Moore Foundation [GBMF1225]
- Resnick Sustainability Institute
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 O-2(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.
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