Journal
ADVANCED MATERIALS
Volume 29, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201606980
Keywords
hydrogen adsorption free energy; hydrogen-evolution reaction; oxygen incorporation; water dissociation
Categories
Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [U1432133, 21601172, 21331005, U1532265, J1030412]
- National Program for Support of Top-notch Young Professionals
- Chinese Academy of Sciences [XDB01020300]
- National Key Scientific Instruments and Equipment Development Program of China [2012YQ22011305]
- China Postdoctoral Science Foundation [2015M580539, 2016T90571]
- Fundamental Research Funds for the Central Universities [WK2060190027, WK2060190061]
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Electrochemical water splitting to produce hydrogen renders a promising pathway for renewable energy storage. Considering limited electrocatalysts have good oxygen-evolution reaction (OER) catalytic activity in acid solution while numerous economical materials show excellent OER catalytic performance in alkaline solution, developing new strategies that enhance the alkaline hydrogen-evolution reaction (HER) catalytic activity of cost-effective catalysts is highly desirable for achieving highly efficient overall water splitting. Herein, it is demonstrated that synergistic regulation of water dissociation and optimization of hydrogen adsorption free energy on electrocatalysts can significantly promote alkaline HER catalysis. Using oxygen-incorporated Co2P as an example, the synergistic effect brings about 15-fold enhancement of alkaline HER activity. Theory calculations confirm that the water dissociation free energy of Co2P decreases significantly after oxygen incorporation, and the hydrogen adsorption free energy can also be optimized simultaneously. The finding suggests the powerful effectiveness of synergetic regulation of water dissociation and optimization of hydrogen adsorption free energy on electrocatalysts for alkaline HER catalysis.
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