Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 41, Pages 11989-11993Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201504815
Keywords
chromium oxide; electrocatalysts; hydrogen-evolution reaction; sustainable chemistry; water splitting
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Funding
- Stanford GCEP, a Steinhart/Reed Award from the Stanford Precourt Institute for Energy
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DOE DE-SC0008684]
- U.S. Department of Energy, Office of Science, Basic Energy Science, Materials Sciences and Engineering Division
- Ministry of Education of Taiwan [NTUST 104DI005]
- ORNL's Center for Nanophase Materials Sciences (CNMS)
- U.S. Department of Energy (DOE) [DE-SC0008684] Funding Source: U.S. Department of Energy (DOE)
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The rising H-2 economy demands active and durable electrocatalysts based on low-cost, earth-abundant materials for water electrolysis/photolysis. Here we report nanoscale Ni metal cores over-coated by a Cr2O3-blended NiO layer synthesized on metallic foam substrates. The Ni@NiO/Cr2O3 triphase material exhibits superior activity and stability similar to Pt for the hydrogen-evolution reaction in basic solutions. The chemically stable Cr2O3 is crucial for preventing oxidation of the Ni core, maintaining abundant NiO/Ni interfaces as catalytically active sites in the heterostructure and thus imparting high stability to the hydrogen-evolution catalyst. The highly active and stable electrocatalyst enables an alkaline electrolyzer operating at 20 mA cm(-2) at a voltage lower than 1.5 V, lasting longer than 3 weeks without decay. The non-precious metal catalysts afford a high efficiency of about 15% for light-driven water splitting using GaAs solar cells.
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