Phase-engineering terraced structure of edge-rich α-Mo2C for efficient hydrogen evolution reaction

Jangwon Bang, In Kyu Moon, Keorock Choi, Jungwoo Oh

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Molybdenum carbide (Mo2C) nanomaterials have become potential candidates for hydrogen evolution reaction (HER) electrocatalysts. However, the electrocatalytic performance of powdery Mo2C is restricted because of the insufficient active sites and structural integrity of the organic binders. In this study, α-Mo2C nanosheets with a terraced structure and numerous edges were directly synthesized on a Cu/Mo substrate as a self-supported electrode and used as an electrocatalyst for HER without binder and transfer processes. The terraced α-Mo2C nanosheets exposed numerous active sites with mixed polymorphs (1T and 1H phases) and Bernal (AB) stacking. They showed long-term stability and satisfactory HER activity, with overpotentials of 226, 324, and 294 mV vs. RHE (at a current density of 10 mA·cm−2) and Tafel slopes of 74, 104, and 63 mV/dec in 1.0 M KOH, 1.0 M PBS, and 0.5 M H2SO4, respectively. Density functional theory calculations revealed that the 1T-1H interface and Bernal stacking at the terraced α-Mo2C enhance the electrocatalytic performance compared to 2D α-Mo2C.

Original languageEnglish
Article number100981
JournalMaterials Today Energy
Volume26
DOIs
Publication statusPublished - 2022 Jun

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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