Sequential Ni-Pt Decoration on Co(OH)2 via Microwave Reduction for Highly Efficient Alkaline Hydrogen Evolution
Luan Liu1, Hongru Liu1, Zikang Chen1
1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
None:
A rapid solvent-free microwave-assisted strategy was developed to fabricate Pt- and Ni-modified Co(OH)2 catalysts for alkaline hydrogen evolution. Among them, Ni-Pt@Co(OH)2, prepared via sequential Ni-first then Pt loading, exhibited the best performance. Structural analyses confirmed uniform Pt dispersion with dominant Pt(111) facets, while ICP-MS showed reduced Pt usage compared to Pt@Co(OH)2. Electrochemical measurements in 1.0 M KOH revealed an overpotential of 71 mV at 10 mA·cm-2, comparable to Pt/C, and a mass activity 4-6.5 times higher across 25-75 mV. EIS demonstrated lower charge-transfer resistance, and stability tests showed negligible degradation after 3000 CV cycles and 11 h continuous operation. The outstanding performance arises from enhanced Pt utilization, abundant conductive sites, and strong Ni-Pt interfacial synergy, highlighting Ni-Pt@Co(OH)2 as a promising catalyst for efficient alkaline HER with reduced Pt consumption.
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