Self-supporting porous Ni-S electrocatalyst with carbon doping for hydrogen evolution reaction

•The Self-supporting porous Ni-S electrocatalysts with carbon doping are electrodeposited by a bubble template method.•Carbon with good electrical conductivity mainly exists in the surface layer.•The porous Ni-S-C films show the highest electrocatalytic activity than that of carbon-free porous films...

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Bibliographic Details
Published in:Materials letters 2021-01, Vol.282, p.128651, Article 128651
Main Authors: Guo, Lingbo, Yuan, Zhangfu, Jiao, Kai, Yu, Xiangtao
Format: Article
Language:English
Subjects:
Carbon
Catalysts
Catalytic activity
Cauliflowers
Charge transfer
Doping
Electrical resistivity
Electrocatalysts
Electrodeposition
Electrolysis
Formation process
Hydrogen evolution
Hydrogen evolution reactions
Materials science
Ni-S-C films
Nickel
Porous materials
Surface layers
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Summary:•The Self-supporting porous Ni-S electrocatalysts with carbon doping are electrodeposited by a bubble template method.•Carbon with good electrical conductivity mainly exists in the surface layer.•The porous Ni-S-C films show the highest electrocatalytic activity than that of carbon-free porous films. Hydrogen evolution catalysts with excellent catalytic activity and low cost play an essential role in industrialization of water electrolysis. Ni-S electrocatalysts with carbon doping are promising hydrogen evolution reaction catalysts because of its high catalytic activity. Carbon has good electrical conductivity, and the synergistic effects of carbon and nickel-based catalysts can further improve the electrocatalytic activity. In order to dope carbon, nickel-thiourea complex was synthesized on the surface of electrocatalysts by a bubble template-directed method. The cauliflower-type Ni-S-C films are formed on the surface, which have much better electrocatalytic activity than porous Ni-S and Ni films in 1 M KOH solution. This work demonstrates that the presence of carbon in the surface layer benefits the charge transfer and improves the electrochemical activity.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128651