Layer-by-Layer Exfoliation of Transition-Metal Dichalcogenides by Amino Acid in Water for Promoting Hydrogen Evolution Reaction

I. Wen Peter Chen, Yen Hsuan Li, Yuan Long Su, Guan Xiang Huang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Two-dimensional transition-metal dichalcogenides (TMDs) are promising as efficient and earth-abundant electrocatalysts for the hydrogen evolution reaction (HER). However, only the edge and defect sites show HER catalytic properties, while the basal plane, which has nonexistent unsaturated sites, is inactive. Herein, we tackle the key challenge of increasing the number of electrocatalytic sites by using a general and facile method for the effective layer-by-layer exfoliation of TMDs in water by using an amino acid, histidine (His), for the scalable production of single-layer TMDs nanosheets, which cannot be achieved using other common amino acids. Besides serving as an effective exfoliating agent, the N of His can also serve as a doping agent to modulate the phase of single-layer TMDs nanosheets for greatly improving their electrocatalytic performance. The exfoliated single-layer MoSe2nanosheets were doped with high surface/bulk ratio Pt nanoparticles (PtNPs) to form MoSe2/PtNPs composites. Detailed electrochemical characterization shows that the MoSe2/PtNPs composite (0.45 at % Pt) exhibited an excellent HER performance with an ultralow overpotential of 198 mV (@100 mA cm-2), a Tafel slope of 24 mV/dec, and long-term electrochemical durability.

Original languageEnglish
Pages (from-to)6207-6214
Number of pages8
JournalJournal of Physical Chemistry C
Volume126
Issue number14
DOIs
Publication statusPublished - 2022 Apr 14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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