Generating Defect‐Rich Bismuth for Enhancing the Rate of Nitrogen Electroreduction to Ammonia

The electrochemical N2 fixation, which is far from practical application in aqueous solution under ambient conditions, is extremely challenging and requires a rational design of electrocatalytic centers. We observed that bismuth (Bi) might be a promising candidate for this task because of its weak b...

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Published in:Angewandte Chemie International Edition 2019-07, Vol.58 (28), p.9464-9469
Main Authors: Wang, Yue, Shi, Miao‐miao, Bao, Di, Meng, Fan‐lu, Zhang, Qi, Zhou, Yi‐tong, Liu, Kai‐hua, Zhang, Yan, Wang, Jia‐zhi, Chen, Zhi‐wen, Liu, Da‐peng, Jiang, Zheng, Luo, Mi, Gu, Lin, Zhang, Qing‐hua, Cao, Xing‐zhong, Yao, Yao, Shao, Min‐hua, Zhang, Yu, Zhang, Xin‐Bo, Chen, Jingguang G., Yan, Jun‐min, Jiang, Qing
Format: Article
Language:English
Subjects:
Adatoms
Ammonia
Aqueous solutions
Bismuth
bismuth nanosheets
Bombardment
Defects
Electrochemistry
nitrogen reduction
Nitrogenation
NMR
non-noble-metals
Nuclear magnetic resonance
quantitative NMR testing
Reduction (metal working)
Selectivity
Test procedures
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Summary:The electrochemical N2 fixation, which is far from practical application in aqueous solution under ambient conditions, is extremely challenging and requires a rational design of electrocatalytic centers. We observed that bismuth (Bi) might be a promising candidate for this task because of its weak binding with H adatoms, which increases the selectivity and production rate. Furthermore, we successfully synthesized defect‐rich Bi nanoplates as an efficient noble‐metal‐free N2 reduction electrocatalyst via a low‐temperature plasma bombardment approach. When exclusively using 1H NMR measurements with N2 gas as a quantitative testing method, the defect‐rich Bi(110) nanoplates achieved a 15NH3 production rate of 5.453 μg mgBi−1 h−1 and a Faradaic efficiency of 11.68 % at −0.6 V vs. RHE in aqueous solution at ambient conditions. Beneficial defects: Defect‐rich bismuth nanoplates achieve a 15NH3 production rate of 5.453 μg mgBi−1 h−1 and a Faradaic efficiency of 11.68 % at −0.6 V vs. RHE in aqueous solutions at ambient conditions because of their poor binding with H adatoms, which increases the selectivity and production rate. Also, 1H NMR measurements with N2 gas ware used as a quantitative test method in aqueous electrolytes.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201903969