Science· 2016Q1
Homogeneously dispersed multimetal oxygen-evolving catalysts
- 2,431citations
- Q1SCImago
- 2016year
Short summary
Gelled FeCoW oxyhydroxides synthesized at room temperature exhibit the lowest reported overpotential (191 mV) for the oxygen-evolution reaction (OER) at 10 mA/cm² in alkaline electrolyte, with no degradation after 500 hours.
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Key points
- Developed room-temperature synthesis for gelled FeCoW oxyhydroxides with homogeneous metal distribution.
- Achieved the lowest reported overpotential of 191 mV at 10 mA/cm² for OER in alkaline electrolyte.
- Catalyst showed no degradation after >500 hours of operation.
- Synergistic interplay between W, Fe, and Co optimizes OER energetics via favorable coordination and electronic structure.
AI-generated from the title and abstract; the full text is not read.
Abstract
Earth-abundant first-row (3d) transition metal-based catalysts have been developed for the oxygen-evolution reaction (OER); however, they operate at overpotentials substantially above thermodynamic requirements. Density functional theory suggested that non-3d high-valency metals such as tungsten can modulate 3d metal oxides, providing near-optimal adsorption energies for OER intermediates. We developed a room-temperature synthesis to produce gelled oxyhydroxides materials with an atomically homogeneous metal distribution. These gelled FeCoW oxyhydroxides exhibit the lowest overpotential (191 millivolts) reported at 10 milliamperes per square centimeter in alkaline electrolyte. The catalyst shows no evidence of degradation after more than 500 hours of operation. X-ray absorption and computational studies reveal a synergistic interplay between tungsten, iron, and cobalt in producing a favorable local coordination environment and electronic structure that enhance the energetics for OER.
The authors' abstract, as published at the source. Science, 2016 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy