期刊
ACS CATALYSIS
卷 9, 期 5, 页码 4593-4599出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b04873
关键词
water oxidation catalysis; hydrogen peroxide synthesis; zinc oxide; density functional theory; electrocatalysis
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-SC0008685]
- Stanford Woods Institute for the Environment
- Stanford Natural Gas Initiative
- U.S. Department of Energy (DOE) [DE-SC0008685] Funding Source: U.S. Department of Energy (DOE)
Electrochemical synthesis of hydrogen peroxide (H2O2) via two-electron water oxidation reaction (2e-WOR) is an ideal process for delocalized production for water cleaning and other applications. Previously reported water oxidation catalysts have limited activity and selectivity, imposing a bottleneck for broad adoption of this technology. We identify ZnO as a new stable, nontoxic, active, and selective catalyst for 2e-WOR to generate H2O2. Using density functional theory calculations, we propose that the (10 (1) over bar0) facet of ZnO is an effective catalyst for 2e-WOR and confirm the prediction experimentally. We synthesize ZnO nanoparticles with a high fraction of (10 (1) over bar0) facets and find that this catalyst gives an overpotential of 40 mV at 0.1 mA/cm(2) and peak Faradaic efficiency of 81% toward H2O2 evolution.
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