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In Situ Fabricated Three-Dimensional Composite Electrode of Mo-Ni3S2/Nickel Foam for Enhanced Electrocatalytic
Xinya Ren1, Taolue Liu1, Fengguang Wang1
1State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Abstract:
Electrochemical water splitting is a crucial pathway for clean hydrogen production, but hydrogen evolution reaction (HER) electrodes often suffer from poor performance in alkaline conditions due to sluggish kinetics and weak durability. In this work, ammonium tetrathiomolybdate ((NH4)2MoS4) is used as a dual-functional precursor to transform Ni(OH)2 nanosheets into 3D Mo-Ni3S2 nanostructures. The fabricated electrode, Mo-Ni3S2/Nickel Foam, with an enlarged electrochemical active surface area, exhibits a low overpotential of 166 mV at 100 mA cm-2 in 1 M KOH and outstanding durability (>300 h). When integrated into anion-exchange membrane electrolyzers (AEMWE), it maintains stability for over 360 h at 500 mA cm-2. The enhanced performance could potentially be attributed to the hierarchical nanostructure that provides abundant active sites, and the in situ fabrication method ensures the durability of the electrode.
