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Synergistic Effect of Molybdenum and Tungsten in Highly Mixed Carbide Nanoparticles as Effective Catalysts in the Hydrogen Evolution Reaction under Alkaline and Acidic Conditions

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Peng,  Baoxiang
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Masa,  Justus
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;
Analytical Chemistry—Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, Bochum, D-44780, Germany;

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Muhler,  Martin
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;
Laboratory of Industrial Chemistry, Ruhr Universität Bochum;

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Citation

Fu, Q., Peng, B., Masa, J., Chen, Y.-T., Xia, W., Schuhmann, W., et al. (2020). Synergistic Effect of Molybdenum and Tungsten in Highly Mixed Carbide Nanoparticles as Effective Catalysts in the Hydrogen Evolution Reaction under Alkaline and Acidic Conditions. ChemElectroChem, 7(4), 983-988. doi:10.1002/celc.202000047.


Cite as: http://hdl.handle.net/21.11116/0000-0007-A6FC-2
Abstract
Monometallic Mo and W carbides as well as highly mixed (Mo,W) carbides with various Mo/W ratios were synthesized directly on oxygen-functionalized carbon nanotubes (OCNTs), and used as noble-metal-free electrocatalysts in the hydrogen evolution reaction (HER) under both acidic and alkaline conditions. A purely orthorhombic structure was found in both monometallic and mixed carbide samples by X-ray diffraction. Transmission electron microscopy images showed that the carbide particles were highly dispersed on the OCNTs with well-controlled particle size. The homogeneous distribution of Mo and W in the carbides was confirmed by elemental mapping. (Mo,W)(2)C/OCNT with a Mo/W ratio of 3 : 1 showed the lowest overpotential to reach a current density of 10 mA/cm(2) (87 mV in 0.1 M KOH and 92 mV in 0.5 M H2SO4), and the smallest Tafel slope of 34 mV/dec. Long-term stability under both alkaline and acidic conditions was demonstrated for 24 h. Our results revealed that an optimal amount of W in the mixed carbide can significantly improve its performance in the HER following the Tafel reaction pathway, most likely due to the weakened Mo-H-ads bond.