Homogeneously dispersed multimetal oxygen-evolving catalysts
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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.
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The record
- Venue
- Science
- Topic
- Electrocatalysts for Energy Conversion
- Field
- Energy
- Canadian institutions
- Canadian Light Source (Canada)University of Toronto
- Funders
- Natural Sciences and Engineering Research Council of CanadaNational Natural Science Foundation of ChinaNatural Science Foundation of ShanghaiChina Scholarship CouncilU.S. Department of Energy
- Keywords
- OverpotentialCatalysisOxygen evolutionTungstenTransition metalCobaltDensity functional theoryValencyMetalChemistryInorganic chemistryChemical engineeringAdsorptionElectrolyteOxygenMaterials sciencePhysical chemistryMetallurgyComputational chemistryElectrochemistryOrganic chemistryElectrode
- Has abstract in OpenAlex
- yes