标题: A durable and pH-universal self-standing MoC-Mo2C heterojunction electrode for efficient hydrogen evolution reaction

作者: Liu, W (Liu, Wei); Wang, XT (Wang, Xiting); Wang, F (Wang, Fan); Du, KF (Du, Kaifa); Zhang, ZF (Zhang, Zhaofu); Guo, YZ (Guo, Yuzheng); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)

来源出版物: NATURE COMMUNICATIONS 卷: 12 期: 1 文献号: 6776 DOI: 10.1038/s41467-021-27118-6 出版年: NOV 22 2021

摘要: Efficient water electrolyzers are constrained by the lack of low-cost and earth-abundant hydrogen evolution reaction (HER) catalysts that can operate at industry-level conditions and be prepared with a facile process. Here we report a self-standing MoC-Mo2C catalytic electrode prepared via a one-step electro-carbiding approach using CO2 as the feedstock. The outstanding HER performances of the MoC-Mo2C electrode with low overpotentials at 500 mA cm(-2) in both acidic (256 mV) and alkaline electrolytes (292 mV), long-lasting lifetime of over 2400 h (100 d), and high-temperature performance (70 C-o) are due to the self-standing hydrophilic porous surface, intrinsic mechanical strength and self-grown MoC (001)-Mo2C (101) heterojunctions that have a Delta G(H*) value of -0.13 eV in acidic condition, and the energy barrier of 1.15 eV for water dissociation in alkaline solution. The preparation of a large electrode (3 cm x 11.5 cm) demonstrates the possibility of scaling up this process to prepare various carbide electrodes with rationally designed structures, tunable compositions, and favorable properties.

Scalable fabrication of Low-cost hydrogen evolution reaction (HER) catalysts that can operate at industry-relevant conditions is highly needed for efficient water electrolyzers. Here the authors show a scalable synthesis of a MoC-Mo2C heterojunction electrode with efficient HER activity and high stability at industrial conditions.

地址: [Liu, Wei; Wang, Fan; Du, Kaifa; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Liu, Wei; Wang, Fan; Du, Kaifa; Yin, Huayi; Wang, Dihua] Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

[Wang, Xiting; Guo, Yuzheng] Wuhan Univ, Sch Elect Engn & Automat, Wuhan 430072, Peoples R China.

[Zhang, Zhaofu] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England.

[Wang, Dihua] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.

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

Yin, HY; Wang, DH (通讯作者)，Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

Guo, YZ (通讯作者)，Wuhan Univ, Sch Elect Engn & Automat, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.

电子邮件地址: yguo@whu.edu.cn; yinhuayi@whu.edu.cn; wangdh@whu.edu.cn

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