Journal
INORGANIC CHEMISTRY
Volume 57, Issue 10, Pages 6010-6015Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b00503
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Funding
- U.S. National Science Foundation Center for Chemical Innovation in Solar Fuels [CHE-1305124]
- American Chemical Society Petroleum Research Fund [54898-DNI10]
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The identification of materials capable of catalyzing the oxygen evolution reaction (OER) in highly acidic electrolytes is a critical bottleneck in the development of many water-splitting technologies. Bulk-scale solid-state compounds can be readily produced using high-temperature reactions and therefore used to expand the scope of earth-abundant OER catalysts capable of operating under strongly acidic conditions. Here, we show that high temperature arc melting and powder metallurgy reactions can be used to synthesize electrodes consisting of intermetallic Ni2Ta that can catalyze the OER in 0.50 M H2SO4. Arc melted Ni2Ta electrodes evolve oxygen at a current density of 10 mA/cm(2) for >66 h with corrosion rates 2 orders of magnitude lower than that of pure Ni. The overpotential required for pellets of polycrystalline Ni2Ta to produce a current density of 10 mA/cm(2) is 570 mV. This strategy can be generalized to include other first-row transition metals, including intermetallic Fe2Ta and Co2Ta systems.
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