A high-density nickel-cobalt alloy embedded in nitrogen-doped carbon nanosheets for the hydrogen evolution reaction

The development of novel non-noble electrocatalysts is critical for an efficient electrochemical hydrogen evolution reaction (HER). In this study, high-density nickel-cobalt alloy nanoparticles embedded in the bent nitrogen-doped carbon nanosheets are prepared as a high-performance catalyst. The opt...

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Bibliographic Details
Published in:Nanoscale 2022-04, Vol.14 (16), p.622-6211
Main Authors: Hu, Lihua, Shi, Jialing, Peng, Zhiguang, Zheng, Zefeng, Dong, Huafeng, Wang, Tiejun
Format: Article
Language:English
Subjects:
Bubbles
Carbon
Catalysts
Cobalt base alloys
Contact angle
Current density
Density functional theory
Electrocatalysts
Energy of dissociation
Gibbs free energy
Heat of formation
Hydrogen
Hydrogen evolution reactions
Nanoalloys
Nanoparticles
Nanosheets
Nickel
Platinum
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Summary:The development of novel non-noble electrocatalysts is critical for an efficient electrochemical hydrogen evolution reaction (HER). In this study, high-density nickel-cobalt alloy nanoparticles embedded in the bent nitrogen-doped carbon nanosheets are prepared as a high-performance catalyst. The optimized Ni 7 Co 3 /NC-500 catalyst displays quite a low overpotential of 90 mV at a current density of 10 mA cm −2 , and a small Tafel slope of 64 mV dec −1 in alkaline medium, and even performs better than commercial 20% Pt/C at a high current density ( η 150 = 233 mV for Ni 7 Co 3 /NC-500 and η 150 = 267 mV for 20% Pt/C). Specifically, the high-density nickel-cobalt alloy (with an average size of 6.2 nm and a distance of
ISSN:2040-3364
2040-3372
DOI:10.1039/d2nr00053a