Effect of microstructure on HER catalytic properties of MoS<inf>2</inf> vertically standing nanosheets

Karla Hernandez Ruiz, Jiajia Liu, Rong Tu, Meijuan Li, Song Zhang, Jorge Roberto Vargas Garcia, Shichun Mu, Haiwen Li, Takashi Goto, Lianmeng Zhang

Research output: Contribution to journalArticle

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Abstract

© 2018 Elsevier B.V. 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.
Original languageAmerican English
Pages (from-to)100-108
Number of pages89
JournalJournal of Alloys and Compounds
DOIs
StatePublished - 30 May 2018
Externally publishedYes

Fingerprint

Nanosheets
Hydrogen
microstructure
Microstructure
hydrogen
wettability
Wetting
slopes
Organic Chemicals
Hydrogen Sulfide
hydrogen sulfide
Poisons
Organic chemicals
Hydrogen sulfide
Sulfur
Molybdenum
Contact angle
molybdenum
metalorganic chemical vapor deposition
Surface morphology

Cite this

Hernandez Ruiz, Karla ; Liu, Jiajia ; Tu, Rong ; Li, Meijuan ; Zhang, Song ; Vargas Garcia, Jorge Roberto ; Mu, Shichun ; Li, Haiwen ; Goto, Takashi ; Zhang, Lianmeng. / Effect of microstructure on HER catalytic properties of MoS<inf>2</inf> vertically standing nanosheets. In: Journal of Alloys and Compounds. 2018 ; pp. 100-108.
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Effect of microstructure on HER catalytic properties of MoS<inf>2</inf> vertically standing nanosheets. / Hernandez Ruiz, Karla; Liu, Jiajia; Tu, Rong; Li, Meijuan; Zhang, Song; Vargas Garcia, Jorge Roberto; Mu, Shichun; Li, Haiwen; Goto, Takashi; Zhang, Lianmeng.

In: Journal of Alloys and Compounds, 30.05.2018, p. 100-108.

Research output: Contribution to journalArticle

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AU - Vargas Garcia, Jorge Roberto

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N2 - © 2018 Elsevier B.V. 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.

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