Effect of microstructure on HER catalytic properties of MoS2 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

10 Citations (Scopus)

Abstract

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 languageEnglish
Pages (from-to)100-108
Number of pages9
JournalJournal of Alloys and Compounds
Volume747
DOIs
Publication statusPublished - May 30 2018

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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    Hernandez Ruiz, K., Liu, J., Tu, R., Li, M., Zhang, S., Vargas Garcia, J. R., Mu, S., Li, H., Goto, T., & Zhang, L. (2018). Effect of microstructure on HER catalytic properties of MoS2 vertically standing nanosheets. Journal of Alloys and Compounds, 747, 100-108. https://doi.org/10.1016/j.jallcom.2018.02.347