标题: Molten-Salt Electrochemical Preparation of Co₂B/MoB₂ Heterostructured Nanoclusters for Boosted pH-Universal Hydrogen Evolution

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

来源出版物: SMALL  DOI: 10.1002/smll.202308549  提前访问日期: DEC 2023  

摘要: Boosting the hydrogen evolution reaction (HER) activity of alpha-MoB2 at large current densities and in pH-universal medium is significant for efficient hydrogen production. In this work, Co2B/MoB2 heterostructured nanoclusters are prepared by molten-salt electrolysis (MSE) and then used as a HER catalyst. The composition, structure, and morphology of Co2B/MoB2 can be modulated by altering the stoichiometries of raw materials and synthesis temperatures. Impressively, the obtained Co2B/MoB2 at optimized conditions exhibits a low overpotential of 297 and 304 mV at 500 mA cm(-2) in 0.5 m H2SO4 and 1 m KOH, respectively. Moreover, the Co2B/MoB2 catalyst possesses a long-term catalytic stability of over 190 h in both acidic and alkaline medium. The excellent HER performance is due to the modified electronic structure at the Co2B/MoB2 heterointerface where electrons are accumulated at the Mo sites to strengthen the H adsorption. Density functional theory (DFT) calculations reveal that the formation of the Co2B/MoB2 heterointerface decreases the H adsorption and H2O dissociation free energies, contributing to the boosted HER intrinsic catalytic activity of Co2B/MoB2. Overall, this work provides an experimental and theoretical paradigm for the design of efficient pH-universal boride heterostructure electrocatalysts.

作者关键词: boride; heterostructure; hydrogen evolution reaction; molten-salt electrolysis; pH-universal

KeyWords Plus: ELECTROCATALYSTS

地址: [Liu, Xianglin; Li, Wenting; Zhang, Yu; 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：13.3