法拉第效率
催化作用
掺杂剂
材料科学
产量(工程)
电化学
氨
电解
兴奋剂
无机化学
纳米技术
选择性
氢
化学工程
分析化学(期刊)
化学
物理化学
光电子学
冶金
环境化学
电极
有机化学
生物化学
电解质
工程类
作者
Guike Zhang,Guohui Wang,Yu‐Ying Wan,Xijun Liu,Ke Chu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-10-23
卷期号:17 (21): 21328-21336
被引量:7
标识
DOI:10.1021/acsnano.3c05946
摘要
Electrochemical conversion of NO3- into NH3 (NO3RR) holds an enormous prospect to simultaneously yield valuable NH3 and alleviate NO3- pollution. Herein, we report monodispersed Bi-doped FeS2 (Bi-FeS2) as a highly effective NO3RR catalyst. Atomic coordination characterizations of Bi-FeS2 disclose that the isolated Bi dopant coordinates with its adjacent Fe atom to create the unconventional p-d hybridized Bi-Fe dinuclear sites. Operando spectroscopic measurements combined with theoretical calculations disclose that Bi-Fe dinuclear sites can synergistically enhance the hydrogenation energetics of NO3--to-NH3 pathway, while suppressing the competitive hydrogen evolution, leading to a high NO3RR selectivity and activity. Consequently, the specially designed flow cell equipped with Bi-FeS2 exhibits a high NH3 yield rate of 83.7 mg h-1 cm-2 with a near-100% NO3--to-NH3 Faradaic efficiency at an ampere-level current density of 1023.2 mA cm-2, together with an excellent long-term stability for 100 h of electrolysis, ranking almost the highest performance among all reported NO3RR catalysts.
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