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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

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.

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 Creators:
Fu, Qi1, Author
Peng, Baoxiang2, Author           
Masa, Justus2, 3, Author           
Chen, Yen-Ting3, Author           
Xia, Wei1, Author
Schuhmann, Wolfgang1, Author
Muhler, Martin2, 4, Author           
Affiliations:
1external, ou_persistent22              
2Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023874              
3Analytical Chemistry—Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, Bochum, D-44780, Germany, ou_persistent22              
4Laboratory of Industrial Chemistry, Ruhr Universität Bochum, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000516865200014
DOI: 10.1002/celc.202000047
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Title: ChemElectroChem
  Abbreviation : ChemElectroChem
Source Genre: Journal
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Publ. Info: Weinheim, Germany : WILEY-VCH Verlag GmbH & Co. KGaA
Pages: - Volume / Issue: 7 (4) Sequence Number: - Start / End Page: 983 - 988 Identifier: ISSN: 2196-0216
CoNE: https://pure.mpg.de/cone/journals/resource/2196-0216