Metallic Iron鈥揘ickel Sulfide Ultrathin Nanosheets As a Highly Active Electrocatalyst for Hydrogen Evolution Reaction in Acidic Media

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• 作者：Xia Long ; Guixia Li ; Zilong Wang ; HouYu Zhu ; Teng Zhang ; Shuang Xiao ; Wenyue Guo ; Shihe Yang
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：137
• 期：37
• 页码：11900-11903
• 全文大小：335K
• ISSN：1520-5126

文摘

We report on the synthesis of iron-nickel sulfide (INS) ultrathin nanosheets by topotactic conversion from a hydroxide precursor. The INS nanosheets exhibit excellent activity and stability in strong acidic solutions as a hydrogen evolution reaction (HER) catalyst, lending an attractive alternative to the Pt catalyst. The metallic 伪-INS nanosheets show an even lower overpotential of 105 mV at 10 mA/cm² and a smaller Tafel slope of 40 mV/dec. With the help of DFT calculations, the high specific surface area, facile ion transport and charge transfer, abundant electrochemical active sites, suitable H⁺ adsorption, and H₂ formation kinetics and energetics are proposed to contribute to the high activity of the INS ultrathin nanosheets toward HER.