我室郑南峰教授和傅钢教授在 Nano Energy 上发表论文：Identifying the electrocatalytic sites of nickel disulfide in alkaline hydrogen evolution reaction

文章链接：http://www.sciencedirect.com/science/article/pii/S2211285517305748

摘要：

Transition-metal chalcogenides have attracted great attention for their superior catalytic activity towards hydrogen evolution reaction (HER) as an alternative to platinum. Here we report a facile method for synthesizing two-dimensional nickel disulfide (NiS₂) by using Ni(OH)₂ on nickel foam as substrate. The as-synthesized NiS₂ displayed an activation period during HER with a remarkable structural and compositional change under alkaline conditions. Electrochemical in situ X-ray absorption spectroscopy revealed that metallic Ni acted as catalytic active species with superior activity of 67 mV to reach 10 mA cm⁻². The in situ generated metallic Ni were easily oxidized to large-area ultrathin Ni(OH)₂ when exposed to air. The overall water splitting device was fabricated by using NiS₂-derived metallic Ni and Fe doped NiS₂-derived hydroxide as HER and OER electrode with a potential of 1.52 V to reach 10 mA cm⁻².