Analysis of Hydrogen Injection-assisted Palladium-Modified Copper-Cobalt Bimetallic Hollow Fibers for Enhanced Electrocatalytic Ammonia Synthesis from Nitrate
10.19756/j.issn.0253-3820.251234
- VernacularTitle:氢气注入辅助钯修饰铜钴双金属中空纤维用于增强硝酸盐电催化制氨性能分析
- Author:
Qing CHEN
1
;
Le-Ting ZHANG
;
Xiao-Long LIANG
;
Ru-Peng LIU
;
Wen-Hui HE
;
Le-Hui LU
Author Information
1. 中国科学技术大学应用化学与工程学院,合肥 230026;中国科学院长春应用化学研究所,电分析化学国家重点实验室,长春 130022
- Keywords:
Hollow fiber electrode;
Nitrate reduction reaction;
Tandem catalysis;
Hydrogen dissociation;
Ammonia electrosynthesis
- From:
Chinese Journal of Analytical Chemistry
2025;53(10):1674-1683,中插5-中插36
- CountryChina
- Language:Chinese
-
Abstract:
The electrocatalytic nitrate reduction reaction(NO3RR)presents a sustainable pathway for large-scale ammonia production,yet it faces significant challenges due to proton supply limitations caused by the high energy barrier for water dissociation,which slows ammonia(NH3)generation.Herein,a palladium(Pd)-modified copper-cobalt(CuCo)hollow fiber penetration electrode that enabled H2 injection through its hollow structures,thereby enhancing proton availability for NO3RR was developed.The active Pd component efficiently dissociated H2,facilitating active hydrogen(*H)spillover and speeding up the cascade NO3RR process on Cu and Co sites.As a result,a half-cell energy efficiency of 39.53%and an NH3 Faradaic efficiency(FE)of 97.11%±1.17%at-0.1 V(vs RHE)were achieved,comparable to state-of-the-art systems.Importantly,the H2-assisted approach prevented the oxidation of active Cu and Co phases,demonstrating exceptional stability with less than 5.6%decay in current density(267 mA/cm2)and retention of NH3 FE at 94.8%after over 70 h of electrolysis.These findings offered valuable insights into proton supply pathways and design of NO3RR electrodes.
