期刊
NANO LETTERS
卷 15, 期 10, 页码 6829-6835出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03298
关键词
Carbon dioxide; CO2 reduction; Cu nanowires; copper nanocatalysts; electrocatalysis; pH effect
类别
资金
- Johns Hopkins University
- Ralph E. Powe Jr. Faculty Enhancement Award (ORAU)
- National Science Foundation [CBET-1437219]
- Energy, Environmental, Sustainability and Health Institute (E2SHI) of Johns Hopkins University
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1437396] Funding Source: National Science Foundation
Electrochemical reduction of CO2, an artificial way of carbon recycling, represents one promising solution for energy and environmental sustainability. However, it is challenged by the lack of active and selective catalysts. Here, we report a two-step synthesis of highly dense Cu nanowires as advanced electrocatalysts for CO2 reduction. CuO nanowires were first grown by oxidation of Cu mesh in air and then reduced by either annealing in the presence of hydrogen or applying a cathodic electrochemical potential to produce Cu nanowires. The two reduction methods generated Cu nano-wires with similar dimensions but distinct surface structures, which have provided an ideal platform for comparative studies of the effect of surface structure on the electrocatalytic properties. In particular, the Cu nanowires generated by electrochemical reduction were highly active and selective for CO2 reduction, requiring an overpotential of only 0.3 V to reach 1 mA/cm(2) electrode current density and achieving Faradaic efficiency toward CO as high as similar to 60%. Our work has advanced the understanding of the structure-property relationship of Cu-based nanocatalysts, which could be valuable for the further development of advanced electrocatalytic materials for CO2 reduction.
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