期刊
NANO ENERGY
卷 62, 期 -, 页码 869-875出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.06.019
关键词
WO3 nanosheets; Nitrogen reduction; Defect engineering; Electrocatalyst
类别
资金
- Beijing Natural Science Foundation [2192039]
- Beijing University of Chemical Technology [XK180301]
- State Key Laboratory of Organic-Inorganic Composites [oic-201901001]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) [M2-201704]
- National Research Foundation of Korea from the Korean Government [NRF-2017R1A2B3010176, NRF-2016M3D1A1021147]
Electrochemical ammonia production under ambient conditions remains a grand challenge. Herein, we demonstrate that efficient binding and reduction of N-2 at low overpotentials can be realized over WO3 with tailored surface oxygen vacancies, as predicted by density functional theory studies and evidenced by an NH3 yield rate of 4.2 mu g(NH3) h(-1) mg(cat)(-1) and a faradaic efficiency of 6.8% at -0.12 V (vs. the reversible hydrogen electrode). A high NH3 faradaic efficiency of up to 12.8% is obtained at an overpotential of only 80 mV, which can even be further improved by increasing the electrolyte pH to suppress the competing hydrogen evolution reaction. This low-cost metal oxide holds great appeal as one of the most promising electrocatalysts for efficient N-2 fixation.
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