双功能
电催化剂
电化学
催化作用
无机化学
吸附
亚硝酸盐
法拉第效率
双金属片
拉曼光谱
可逆氢电极
材料科学
电极
化学
化学工程
硝酸盐
工作电极
有机化学
物理化学
工程类
物理
光学
作者
Jia-Yi Fang,Qizheng Zheng,Yao‐Yin Lou,Kuangmin Zhao,Sheng-Nan Hu,Guang Li,Ouardia Akdim,Xiaoyang Huang,Shi‐Gang Sun
标识
DOI:10.1038/s41467-022-35533-6
摘要
The development of electrocatalysts capable of efficient reduction of nitrate (NO3-) to ammonia (NH3) is drawing increasing interest for the sake of low carbon emission and environmental protection. Herein, we present a CuCo bimetallic catalyst able to imitate the bifunctional nature of copper-type nitrite reductase, which could easily remove NO2- via the collaboration of two active centers. Indeed, Co acts as an electron/proton donating center, while Cu facilitates NOx- adsorption/association. The bio-inspired CuCo nanosheet electrocatalyst delivers a 100 ± 1% Faradaic efficiency at an ampere-level current density of 1035 mA cm-2 at -0.2 V vs. Reversible Hydrogen Electrode. The NH3 production rate reaches a high activity of 4.8 mmol cm-2 h-1 (960 mmol gcat-1 h-1). A mechanistic study, using electrochemical in situ Fourier transform infrared spectroscopy and shell-isolated nanoparticle enhanced Raman spectroscopy, reveals a strong synergy between Cu and Co, with Co sites promoting the hydrogenation of NO3- to NH3 via adsorbed *H species. The well-modulated coverage of adsorbed *H and *NO3 led simultaneously to high NH3 selectivity and yield.
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