标题: Boosting hydrogen evolution kinetics of self-supported MoC-Mo2C heterojunction electrode by platinum decoration

作者: Li, WT (Li, Wenting); Yao, YP (Yao, Yuanpeng); Liu, XL (Liu, Xianglin); Zhang, Y (Zhang, Yu); Liu, W (Liu, Wei); Liu, Z (Liu, Ze); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)

来源出版物: ELECTROCHIMICA ACTA  卷: 483  文献号: 143922  DOI: 10.1016/j.electacta.2024.143922  Early Access Date: MAR 2024  Published Date: 2024 APR 10  

摘要: Molybdenum carbide -based hydrogen evolution reaction (HER) electrocatalysts have attracted widespread attention with their low cost and relatively high catalytic activity. Despite the significant progress made in tuning the morphology and structure, the intrinsic catalytic activity of molybdenum carbide awaits further improvement. Herein, a Pt -decorated self -supported MoC-Mo2C electrode with super -intrinsic HER catalytic activity is prepared by a simple adsorption-electroreduction method. The HER performance is improved with increasing the loading of Pt. The optimal MoC-Mo2C-Pt heterojunction electrode has a low overpotential of 10 mA cm -2 (58 mV in H2SO4, 82 mV in KOH) and small Tafel slope (24 mV dec- 1 in H2SO4, 29 mV dec- 1 in KOH), which is reduced to 0.45-0.5, 0.7-0.8, and 0.4-0.7 times of pristine MoC-Mo2C, Pt foil, and commercial Pt/C (2 mg cm -2), respectively. The improved HER catalysis is attributed to the rapid dissociation of water on MoC-Mo2C and efficient desorption of hydrogen on Pt. Therefore, decorating carbides with Pt is an effective way to design HER catalysts with enhanced catalytic activities in a wide pH range.

作者关键词: Platinum; Molybdenum carbide; Hydrogen evolution reaction; Electrocatalysis

KeyWords Plus: BIFUNCTIONAL CATALYST; EFFICIENT; NANOWIRE

地址: [Li, Wenting; Liu, Xianglin; Zhang, Yu; Liu, Wei; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Yao, Yuanpeng; Liu, Ze] Wuhan Univ, Sch Civil Engn, Dept Engn Mech, Wuhan 430072, Peoples R China.

通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址: wangdh@whu.edu.cn

影响因子：6.6