Homogeneously dispersed multimetal oxygen-evolving catalysts
Citation:
Zhang, B.; Zheng, X.; Voznyy, O.; Comin, R.; Bajdich, M.; García-Melchor, M.; Xu, J.; Liu, M.; Pelayo García de Arquer, F.; Thang Dinh, C.; Fan, F.; Yuan, M.; Yassitepe, E.; Janmohamed, A.; Chen, N.; Regier, T.; Han, L.; Xin, H. L.; Zheng, L.; Yang, H.; Vojvodic, A.; Sargent, E. H., Homogeneously dispersed multimetal oxygen-evolving catalysts, Science, 352, 2016, 333 - 337Download Item:
Abstract:
Earth-abundant first-row (3d) transition-metal-based catalysts have been developed for the oxygen-evolution reaction (OER); however, they operate at overpotentials significantly above thermodynamic requirements. Density functional theory suggested that non-3d high-valency metals such as tungsten can modulate3d metal oxides,providing near-optimal adsorption energies for OER intermediates.We developed a room-temperature synthesis to produce gelled oxy-hydroxide materials with an atomically homogeneous metal distribution. These gelled FeCoW oxy-hydroxide exhibits the lowest overpotential (191mV) reported at 10 milliamperes per square centimeter in alkaline electrolyte. The catalyst shows no evidence of degradation following more than 500 hours of operation. X-ray absorption and computational studies reveal asynergistic interplay between W, Fe and Co in producing a favorable local coordination environment and electronic structure that enhance the energetics for OER.
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http://people.tcd.ie/garciammDescription:
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Author: Garcia Melchor, Max
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Journal ArticleCollections
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Science352
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Full text availableKeywords:
Oxygen evolution reaction, Fuel cells, Water electrolysisDOI:
http://dx.doi.org/10.1126/science.aaf1525Metadata
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