Citation: Longtao Zhu, Yinan Zhao, Wenhao Yang, Hsien-Yi Hsu, Ping Peng, Fang-Fang Li. Low-temperature selective synthesis of metastable α-MoC with electrochemical properties: Electrochemical co-reduction of CO₂ and MoO₃ in molten salts[J]. Chinese Chemical Letters, ;2024, 35(1): 108583. doi: 10.1016/j.cclet.2023.108583 shu

Low-temperature selective synthesis of metastable α-MoC with electrochemical properties: Electrochemical co-reduction of CO₂ and MoO₃ in molten salts

Longtao Zhu ^a ,
Yinan Zhao ^a ,
Wenhao Yang ^a ,
Hsien-Yi Hsu ^b ,
Ping Peng ^{a, *,} ,
Fang-Fang Li ^{a, *,}

a.
School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
b.
School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China

ppeng@hust.edu.cn

ffli@hust.edu.cn

Received Date: 26 March 2023
Revised Date: 13 May 2023
Accepted Date: 16 May 2023
Available Online: 20 May 2023

Figures(5)

Metastable molybdenum carbide (α-MoC), as a catalyst and an excellent support for metal catalysts, has been widely used in thermo/electro-catalytic reactions. However, the selective synthesis of α-MoC remains a great challenge. Herein, a simple one-pot synthetic strategy for the selective preparation of metastable α-MoC is proposed by electrochemical co-reduction of CO₂ and MoO₃ in a low-temperature eutectic molten carbonate. The synthesized α-MoC shows a reed flower-like morphology. By controlling the electrolysis time and monitoring the phase and morphology of the obtained products, the growth process of α-MoC is revealed, where the carbon matrix is deposited first followed by the growth of α-MoC from the carbon matrix. Moreover, by analyzing the composition of the electrolytic products, the formation mechanism for α-MoC is proposed. In addition, through this one-pot synthetic strategy, S-doped α-MoC is successfully synthesized. Density functional theory (DFT) calculations reveal that S doping enhanced the HER performance of α-MoC by facilitating water absorption and dissociation and weakening the bond energy of Mo-H to accelerate H desorption. The present work not only highlights the valuable utilization of CO₂ but also offers a new perspective on the design and controllable synthesis of metal carbides and their derivatives.
- α-MoC,
- CO₂ electroreduction,
- Molten salt,
- Sulfur doping,
- Hydrogen evolution reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Low-temperature selective synthesis of metastable α-MoC with electrochemical properties: Electrochemical co-reduction of CO2 and MoO3 in molten salts

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通讯作者: 陈斌, bchen63@163.com

Low-temperature selective synthesis of metastable α-MoC with electrochemical properties: Electrochemical co-reduction of CO₂ and MoO₃ in molten salts