化学
电合成
催化作用
双金属片
氨生产
产量(工程)
氨
硝酸盐
盐(化学)
无机化学
制氢
化学工程
电化学
电极
有机化学
冶金
材料科学
物理化学
工程类
作者
Wonsik Jang,Dongrak Oh,Jin‐Young Lee,Jongkyoung Kim,Jesse E. Matthews,Hyoseok Kim,Sang‐Won Lee,Seunghyun Lee,Yi Xu,Je Min Yu,Seon Woo Hwang,Thomas F. Jaramillo,Ji‐Wook Jang,Seungho Cho
摘要
Electrocatalytic nitrate reduction reaction (NO3RR) presents an innovative approach for sustainable NH3 production. However, selective NH3 production is hindered by the multiple intermediates involved in the NO3RR process and the competitive hydrogen evolution reaction. Hence, the development of highly efficient NO3RR catalysts is paramount. Herein, we report highly efficient bimetallic catalysts derived from hydroxy double salt (HDS). Under NO3RR conditions, Cu1Co1-HDS undergoes in situ reconstruction, forming nanocomposites of homogeneously distributed metallic Cu0 and Co(OH)2. Reconstruction-induced Cu0 rapidly converts NO3– to NO2–, which is further hydrogenated to NH3 by Co(OH)2. Homogeneously mixed Cu and Co species maximize this synergistic effect, achieving outstanding NO3RR performance including the highest NH3 yield rate (4.625 mmol h–1 cm–2) reported for powder-type NO3RR catalysts. Integration of Cu1Co1-HDS with a commercial Si solar cell attained 4.53% solar-to-ammonia efficiency from industrial wastewater-level concentrations of NO3– (2000 ppm), demonstrating practical application potential for solar-driven NH3 production. This study provides a strategy for enhancing the NH3 yield rate by optimizing the compositions and distributions of Cu and Co.
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