Basal-plane catalytic activity of layered metallic transition metal ditellurides for the hydrogen evolution reaction

Hagyeong Kwon, Dongyeon Bae, Hyeyoung Jun, Byungdo Ji, Dongyeun Won, Jun Ho Lee, Young Woo Son, Heejun Yang, Suyeon Cho

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We report the electrochemical hydrogen evolution reaction (HER) of two-dimensional metallic transition metal dichalcogenides (TMDs). TMTe2 (TM: Mo, W, and V) single crystals were synthesized and characterized by optical microscopy, X-ray diffraction, and electrochemical measurements. We found that TMTe2 acts as a HER-active catalyst due to the inherent catalytic activity of its basal planes. Among the three metallic TMTe2, VTe2 shows the best HER performance with an overpotential of 441 mV and a Tafel slope of 70 mV/dec. It is 668 mV and 137 mV/dec for MoTe2 and 692 mV and 169 mV/dec for WTe2. Even though VTe2 has the lowest values in the exchange current density, the active site density, and turn-over-frequency (TOF) among the three TMTe2, the lowest charge transfer resistance (RCT) of VTe2 seems to be critical to achieving the best HER performance. First-principles calculations revealed that the basal-plane-active HER performance of metallic TMDs can be further enhanced with some Te vacancies. Our study paves the way to further study of the inherent catalytic activity of metallic 2D materials for active hydrogen production.

Original languageEnglish
Article number3087
JournalApplied Sciences (Switzerland)
Volume10
Issue number9
DOIs
StatePublished - 1 May 2020

Keywords

  • Hydrogen evolution reaction (HER)
  • Transition metal dichalcogenide (TMD)
  • Two-dimensional (2D) material

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