Electrocatalytic activity of WB2 electrodes for hydrogen evolution reaction prepared by different methods

被引:0
作者
Wang, Shixuan [1 ,2 ]
Zhang, Yangwei [1 ,2 ]
Long, Ying [1 ,2 ]
Lin, Hua-Tay [1 ,2 ]
机构
[1] Guangdong Univ Technol, State Key Lab High Performance Tools, Guangzhou 510006, Guangdong, Peoples R China
[2] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Self-supporting electrode; HER; SPS; CATALYSTS; ELECTROLYSIS; EFFICIENT; DIBORIDE;
D O I
10.1016/j.jeurceramsoc.2025.117185
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Tungsten diboride (WB2) exhibits excellent catalytic activity and stability in the hydrogen evolution reaction (HER) of water electrolysis, which are found to be closely related to the processing method of the electrode. In the present work, flake-like WB2 powder was used to prepare self-supported electrodes through spark plasma sintering (SPS) at 750, 800, and 1600 degrees C, respectively, as well as cold isostatic pressing (CIP), with the electrode prepared by drop-casting from powder direction. The results showed that, in an acidic medium, the sample sintered at 750 degrees C exhibited an overpotential of 141.6 mV at 10 mA/cm2, with a corresponding Tafel slope of 42.1 mV/dec, which demonstrated a high catalytic activity. In addition, the experimental results showed that the WB2 particles bonded together to form a porous network structure after SPS low-temperature sintering, resulting in a high density of actively catalytic sites, reduced electron transfer impedance, and exceptional long-term stability.
引用
收藏
页数:6
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