3D Ni-Co sulfoxide nanosheet arrays electrodeposited on Ni foam: A bifunctional electrocatalyst towards efficient and stable water splitting

Developing highly active and stable electrocatalysts from earth-abundant elements are imperative for the large-scalable production of hydrogen. Herein, the three dimensional amorphous NiCoSxOy nanosheets arrays directly grow on Ni foam (NiCoSxOy NSs/NF) through a facile one-step electrodeposition is...

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Bibliographic Details
Published in:Electrochimica acta 2018-12, Vol.292, p.347-356
Main Authors: Li, Changqing, Zhao, Xu, Liu, Yiwen, Wei, Wei, Lin, Yuqing
Format: Article
Language:English
Subjects:
Arrays
Conductivity
Electrical resistivity
Electrocatalysis
Electrocatalysts
Electrodeposition
Electrodes
Hydrogen
Hydrogen evolution reactions
Hydrogen production
Hydroxides
Metal foams
Nanosheets
Nanosheets arrays
Ni-Co sulfoxide
Oxygen evolution reactions
S ligand modulation
Water splitting
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Summary:Developing highly active and stable electrocatalysts from earth-abundant elements are imperative for the large-scalable production of hydrogen. Herein, the three dimensional amorphous NiCoSxOy nanosheets arrays directly grow on Ni foam (NiCoSxOy NSs/NF) through a facile one-step electrodeposition is firstly reported. The special in-situ grown 3D nanosheets arrays, largely exposed active sites and enhanced electrical conductivity enable the resultant NiCoS0.14O3.25 NSs/NF to possess remarkable electrocatalytic performance and stability towards water splitting in 1 M KOH. Specifically, the introduction of S ligand into the hydroxides through a straightforward and convenient electrodeposition method boost the robust composition and comprehensive activity of the NiCoSxOy NSs. Such binder-free, easily prepared NiCoS0.14O3.25 NSs/NF electrode requires the overpotential of 250 mV and 170 mV at 10 mA cm−2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When functionalizing as two identical cathode and anode in an alkaline electrolyzer, NiCoS0.14O3.25 NSs/NF displays the efficient and robust property on both OER and HER. Remarkably, serving as bifunctional electrode in alkaline electrolyzer, it only needs 1.64 V to reach the current density of 20 mA cm−2. This study provides a valuable guideline to synthesize non-noble and efficient bifunctional electrocatalysts using a time-saving but facile electrochemical method. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.06.159