High-Performance Electrocatalysis for Hydrogen Evolution Reaction Using Se-Doped Pyrite-Phase Nickel Diphosphide Nanostructures

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• 作者：Junqiao Zhuo ; Miguel Cab谩n-Acevedo ; Hanfeng Liang ; Leith Samad ; Qi Ding ; Yongping Fu ; Meixian Li ; Song Jin
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：November 6, 2015
• 年：2015
• 卷：5
• 期：11
• 页码：6355-6361
• 全文大小：555K
• ISSN：2155-5435

文摘

The study of efficient, robust, and earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) is essential for hydrogen-based energy technologies. Previous works have demonstrated that pyrite-structure materials (e.g., CoS₂, NiSe₂) are efficient HER catalysts. Here, we first systematically investigate the nanostructure synthesis of a series of pyrite-phase nickel phosphoselenide materials鈥擭iP₂, Se-doped NiP₂ (NiP_1.93Se_0.07), P-doped NiSe₂ (NiP_0.09Se_1.91), and NiSe₂鈥攖hrough a facile thermal conversion of Ni(OH)₂ nanoflakes. The similar nanostructures enable a systematic and fair comparison of their structural properties and catalytic activities for HER. We found that NiP_1.93Se_0.07 shows the best HER performance, followed by NiP₂, NiP_0.09Se_1.91, and NiSe₂. Se-doped NiP₂ grown on carbon fiber paper can achieve an electrocatalytic current density of 10 mA cm^鈥? at an overpotential as low as 84 mV and a small Tafel slope of 41 mV decade^鈥?. This study not only estabilishes Se-doped NiP₂ as a competitive HER catalyst, but also demonstrates that doping or alloying of developed catalysts (especially doping with anions from another group; e.g., selenium to phosphorus) can improve the HER catalytic activity, which provides a general strategy to improve catalytic efficiencies of existing electrocatalysts for HER.