In situ assembly of Ni3S2 nanosheets encapsulated with NiFe(oxy)hydroxides for efficient water oxidation

Morphology control plays a pivotal role in achieving an exceptionally efficient electrocatalyst with abundant active sites and outstanding electrical conductivity. In this study, we employed a sophisticated chemical nanoengineering technique to fabricate an exquisitely thin NiFe(OH)x electrocatalyst...

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Published in:Chemical communications (Cambridge, England) England), 2024-02, Vol.60 (15), p.2086-2089
Main Authors: Yu, Wei, Liu, Zhao, Han, Zhenze, Liu, Taolue, Ding, Xin, Gao, Yan
Format: Article
Language:English
Subjects:
Aqueous solutions
Core-shell structure
Electrical resistivity
Electrocatalysts
Electrodes
Electron transport
Hydroxides
Interlayers
Intermetallic compounds
Iron compounds
Metal foams
Nanoengineering
Nanosheets
Nickel compounds
Nickel sulfide
Oxidation
Oxygen evolution reactions
Sulfurization
Water splitting
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Summary:Morphology control plays a pivotal role in achieving an exceptionally efficient electrocatalyst with abundant active sites and outstanding electrical conductivity. In this study, we employed a sophisticated chemical nanoengineering technique to fabricate an exquisitely thin NiFe(OH)x electrocatalyst on Ni3S2 nanosheets. Firstly, the Ni3S2 nanosheets were synthesized through an innovative in situ one-step sulfurization reaction of the Ni(OH)2 nanosheets grown on Ni foam. Subsequently, a remarkable ultrathin layer of NiFe(OH)x was precisely deposited onto the surface of the Ni3S2 to form a captivating core–shell structure using a chemical dipping method. The resulting electrode, denoted as NiFe(OH)x/Ni3S2/NF, exhibited exceptional electrocatalytic activity and durability towards the oxygen evolution reaction (OER), owing to its expansive specific surface area, rapid electron transport, and robust interlayer bonding. Notably, this electrode achieved an impressive current density of 100 mA cm−2 at an astonishingly low overpotential of 218 mV while maintaining a low Tafel slope of 37.9 mV dec−1 and remarkable stability for up to 12 days in 1 M KOH aqueous solution. This work presents an alluring novel approach for constructing highly efficient ultrathin catalysts for water splitting.
ISSN:1359-7345
1364-548X
DOI:10.1039/d3cc06032b