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Published on: August 15, 2019
Ambient N2 fixation to NH3 electrocatalyzed by a spinel Fe3O4 nanorod
Qin Liu1, Xiaoxue Zhang, Bing Zhang
1Key Laboratory of Chemical Synthesis and Pollution Control of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Sichuan, China. xpsun@uestc.edu.cn.
Abstract:
Industrially, NH3 is mainly produced via the Haber-Bosch process which is not only energy-consuming but emits a large amount of CO2. Electrochemical reduction is regarded as an environmentally-benign alternative for sustainable NH3 synthesis, and its efficiency heavily depends on the identification of Earth-abundant catalysts with high activity for the N2 reduction reaction (NRR). In this work, we report that a spinel Fe3O4 nanorod on a Ti mesh (Fe3O4/Ti) acts as an efficient and durable NRR electrocatalyst under ambient conditions. When tested in 0.1 M Na2SO4, such Fe3O4/Ti achieves a high faradaic efficiency of 2.6% and a NH3 yield 5.6 × 10-11 mol s-1 cm-2 and at -0.4 V vs. a reversible hydrogen electrode.
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