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Electrochemical N2 fixation by Cu-modified iron oxide dendrites

Author:
Huang, Chengrong, Shang, Longmei, Han, Peng, Gu, Zhengxiang, Al-Enizi, Abdullah M., Almutairi, Tahani M., Cao, Na, Zheng, Gengfeng
Source:
Journal of colloid and interface science 2019 v.552 pp. 312-318
ISSN:
0021-9797
Subject:
adsorption, ammonia, aqueous solutions, catalysts, catalytic activity, dendrites, electrochemistry, electrodes, hydrogen, iron oxides, nitrogen, nitrogen fixation
Abstract:
The electrochemical nitrogen reduction reaction (NRR) under mild conditions is significantly challenging, due to the extremely high stability of dinitrogen (N2) molecules. The NRR pathway also confronts the competitive water reduction reaction that takes places universally in an aqueous solution. Herein, a Fe2O3/Cu catalyst is demonstrated as an efficient NRR electrocatalyst. The electronic interactions elevate the d-state electron center, enabling strong back-bonding for N2 molecules. The altering of d-electron distribution promotes the adsorption of N2, leading to a high catalytic activity. As a result, the Fe2O3/Cu catalyst exhibits an outstanding ammonia production rate of 15.66 μg·h−1·mgcat.−1 at −0.1 V versus reversible hydrogen electrode (RHE), a Faradaic efficiency of 24.4%, and a good electrochemical stability.
Agid:
6448459