Oxygen vacancy enables electrochemical N-2 fixation over WO3 with tailored structure

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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.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2019-08
Language
English
Article Type
Article
Citation

NANO ENERGY, v.62, pp.869 - 875

ISSN
2211-2855
DOI
10.1016/j.nanoen.2019.06.019
URI
http://hdl.handle.net/10203/263868
Appears in Collection
EEW-Journal Papers(저널논문)
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