首页|Low-temperature selective synthesis of metastable α-MoC with electrochemical properties:Electrochemical co-reduction of CO2 and MoO3 in molten salts
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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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 pro-cess 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 for-mation mechanism for α-MoC is proposed.In addition,through this one-pot synthetic strategy,S-dopedα-MoC is successfully synthesized.Density functional theory(DFT)calculations reveal that S doping en-hanced 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.
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