Effect of microstructure on HER catalytic properties of MoS^sub 2^ vertically standing nanosheets

MoS2 vertically standing nanosheets were prepared by metal-organic chemical vapor deposition using molybdenum hexacarbonyl (Mo(CO)6) and 1,2-ethanedithiol (C2H6S2) as precursors. The sulfur source was chosen as a less toxic alternative to the well-established hydrogen sulfide (H2S). These films were...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 747; p. 100
Main Authors Ruiz, Karla Hernandez, Liu, Jiajia, Tu, Rong, Li, Meijuan, Zhang, Song, Garcia, Jorge Roberto Vargas, Mu, Shichun, Li, Haiwen, Goto, Takashi, Zhang, Lianmeng
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 30.05.2018
Subjects
Catalysis
Chemical vapor deposition
Contact angle
Electrochemical analysis
Hydrogen
Hydrogen evolution reactions
Hydrogen sulfide
Metalorganic chemical vapor deposition
Microstructure
Molybdenum
Molybdenum disulfide
Morphology
Nanosheets
Nanostructured materials
Organic chemistry
Wettability
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Summary:MoS2 vertically standing nanosheets were prepared by metal-organic chemical vapor deposition using molybdenum hexacarbonyl (Mo(CO)6) and 1,2-ethanedithiol (C2H6S2) as precursors. The sulfur source was chosen as a less toxic alternative to the well-established hydrogen sulfide (H2S). These films were deposited between 500 and 800 °C resulting in different surface morphologies, from nanoparticles to vertically standing nanosheets. A highly (002) oriented 2H-MoS2 film was obtained at 700 °C. The effect of the microstructure on the catalytic performance of hydrogen evolution reaction (HER) of the MoS2 films was investigated. The Tafel slope varied from 68 to 94 mV/dec, showing that the microstructure of the films had an influence on their final electrochemical performance. Water contact angle analysis was used to study the surface wettability of the films, obtaining values from 60 to 121.2°. These results exhibited a quite consistent trend with the Tafel slope, indicating a significant effect of wettability and nanosheets edge exposure on the HER performance.
ISSN:0925-8388
1873-4669