Ni3P-Ni heterostructure electrocatalyst for alkaline hydrogen evolution
Journal of Alloys and Compounds(2022)
Abstract
Highly active and stable electrocatalysts at low cost for hydrogen evolution reaction are essential for large scale hydrogen production. The Ni3P-Ni heterostructure confined in 3D networks of carbon nanotube (CNT) has been successfully prepared as the hydrogen evolution reaction (HER) electrode. The morphology and phase composition of Ni3P-Ni heterostructure are tunable by varying the acid pickling time. The Ni3P-Ni/CNT composite electrode with optimized Ni:Ni3P ratio of 22.29 wt% demonstrate high catalytic activity and excellent stability for HER. It demonstrates a comparable HER activity to the standard Pt electrode in alkaline solution, i.e., overpotentials of 116 vs 67 mV at 10 mA·cm−2 and Tafel slops of 59 vs 37 mV·dec−1. No degradation is observed after 1000 cyclic voltammetry (CV) cycles or 50 h operation under constant 0.3 V overpotential.
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Key words
Ni3P-Ni heterostructure,Electrocatalyst,Acid picking,Hydrogen evolution reaction
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