查找使用阿拉丁产品的科研文献

Thermal migration towards constructing W-W dual-sites for boosted alkaline hydrogen evolution reaction

Chen Zhigang,Xu Yafeng,Ding Ding,Song Ge,Gan Xingxing,Li Hao,Wei Wei,Chen Jian,Li Zhiyun,Gong Zhongmiao,Dong Xiaoming,Zhu Chengfeng,Yang Nana,Ma Jingyuan,Gao Rui,Luo Dan,Cong Shan,Wang Lu,Zhao Zhigang,Cui Yi

Tungsten carbides, featured by their Pt-like electronic structure, have long been advocated as potential replacements for the benchmark Pt-group catalysts in hydrogen evolution reaction. However, tungsten-carbide catalysts usually exhibit poor alkaline HER performance because of the sluggish hydrogen desorption behavior and possible corrosion problem of tungsten atoms by the produced hydroxyl intermediates. Herein, we report the synthesis of tungsten atomic clusters anchored on P-doped carbon materials via a thermal-migration strategy using tungsten single atoms as the parent material, which is evidenced to have the most favorable Pt-like electronic structure by in-situ variable-temperature near ambient pressure X-ray photoelectron spectroscopy measurements. Accordingly, tungsten atomic clusters show markedly enhanced alkaline HER activity with an ultralow overpotential of 53 mV at 10 mA/cm 2 and a Tafel slope as low as 38 mV/dec. These findings may provide a feasible route towards the rational design of atomic-cluster catalysts with high alkaline hydrogen evolution activity.