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One-step controlled electrodeposition nickel sulfides heterointerfaces favoring the desorption of hydroxyl groups for efficient hydrogen generation
The heterointerface engineering involving different components or phases represents a desirable strategy for enhancing the sluggish kinetics of hydrogen evolution reaction (HER). However, constructing desired heterointerfaces and elucidating the reaction mechanisms on the interface remains a conside...
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Published in: | Rare metals 2024-09, Vol.43 (9), p.4377-4386 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | The heterointerface engineering involving different components or phases represents a desirable strategy for enhancing the sluggish kinetics of hydrogen evolution reaction (HER). However, constructing desired heterointerfaces and elucidating the reaction mechanisms on the interface remains a considerable challenge. In this work, we propose a straightforward electrochemical synthesis strategy to prepare the nickel sulfide-based heterointerfaces for HER. The mechanism of electrochemical synthesis is revealed, wherein metal-thiourea species can be formed at the cathode potential and subsequently oxidized to nickel sulfides at the anode potentials. Leveraging this mechanism, a range of nickel sulfides, including NiS, Ni
3
S
2
/NiS, Ni/Ni
3
S
2
and Ni
3
S
2
, have been successfully synthesized by tuning the potential range of cyclic voltammetry. Among these, the obtained Ni
3
S
2
/NiS@CC (CC: carbon cloth) exhibits the smallest overpotential of 84 mV at 10 mA·cm
−2
and high stability. Theoretical calculations further reveal that the combination of NiS and Ni
3
S
2
induces electron redistribution at the interface, and thus the Volmer process is effectively promoted with faster water dissociation and OH desorption kinetics. Significantly, the simplicity method coupled with a clear synthesis mechanism and outstanding HER performance highlights its promising potential for practical applications.
Graphical abstract |
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ISSN: | 1001-0521 1867-7185 |
DOI: | 10.1007/s12598-024-02806-6 |