Formation of thin catalytic WSe x layer on graphite electrodes for activation of hydrogen evolution reaction in aqueous acid

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• 作者：S. N. Grigoriev ; V. Yu. Fominski ; V. N. Nevolin…
• 刊名：Inorganic Materials: Applied Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：7
• 期：2
• 页码：285-291
• 全文大小：3,303 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Russian Library of Science
  Industrial Chemistry and Chemical Engineering
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：2075-115X
• 卷排序：7

文摘

The possibility of obtaining new relatively inexpensive electrode materials to provide enhanced efficiency of hydrogen evolution reaction (HER) in an aqueous acid solution was investigated. For this purpose, the surface properties of cathodes made of microcrystalline graphite were modified by pulsed laser deposition of thin films of WSe_x. The structure, morphology, and chemical composition of the thin film coatings were varied by changing the deposition conditions and subsequent heat treatment. The compact and dense structure of the film in an amorphous and crystalline state did not result in a marked positive impact on the character of the HER process, which was investigated in 0.5 M H₂SO₄ solution at room temperature. Formation of thin layers consisting of nanocrystalline “petals” WSe₂ caused an increase in cathodic current by more than 6 times (at a voltage of–150 mV), and the Tafel slope of the voltage vs. current curve was reduced by about 80 mV/dec. The conditions were determined to produce on the surface of the graphite cathode a high density of new catalytically active sites that formed on edges of molecular planes forming a layered structure characteristic of WSe₂ nanocrystals.Keywordstransition metal chalcogenideshydrogenpulsed laser depositionnanostructurecatalystelectrochemistry