Constructing well-dispersed active phase via spontaneous redox for electrochemical nitrate reduction to ammonia
Huiqun Cao1,2, Bin Liang1,2, Wenda Chen1,2
1Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, P. R. China. caohuiqun@szu.edu.cn.
Abstract:
In this study, a distinctive multiple core-shell structure of Co nanoparticles inserted into N-doped carbon dodecahedron@Co hydroxide (Co/NCD@Co(OH)2) was synthesized via a spontaneous redox reaction between metallic Co and NO3-, ultimately materializing the fine dispersion and exposure of the active sites. The electronic interaction existing between the Co/NCD core and the Co(OH)2 shell brings a synergistic effect, conspicuously lessens the overpotential, and reinforces the yield-rate and faradaic efficiency of NH3 for electrochemical nitrate-ammonia conversion. This study underlines the spontaneous redox between the catalysts and substrate, rendering it as a synthetic strategy for designing genuine and well-dispersed active sites.
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