Using Exciton/Trion Dynamics to Spatially Monitor the Catalytic Activities of MoS2during the Hydrogen Evolution Reaction

Fu He Hsiao, Cheng Chu Chung, Chun Hao Chiang, Wei Neng Feng, Wen Yen Tzeng, Hung Min Lin, Chien Ming Tu, Heng Liang Wu, Yu Han Wang, Wei Yen Woon, Hsiao Chien Chen, Ching Hsiang Chen, Chao Yuan Lo, Man Hong Lai, Yu Ming Chang, Li Syuan Lu, Wen Hao Chang, Chun Wei Chen, Chih Wei Luo

Research output: Contribution to journalArticlepeer-review

Abstract

The adsorption and desorption of electrolyte ions strongly modulates the carrier density or carrier type on the surface of monolayer-MoS2catalyst during the hydrogen evolution reaction (HER). The buildup of electrolyte ions onto the surface of monolayer MoS2during the HER may also result in the formation of excitons and trions, similar to those observed in gate-controlled field-effect transistor devices. Using the distinct carrier relaxation dynamics of excitons and trions of monolayer MoS2as sensitive descriptors, an in situ microcell-based scanning time-resolved liquid cell microscope is set up to simultaneously measure the bias-dependent exciton/trion dynamics and spatially map the catalytic activity of monolayer MoS2during the HER. This operando probing technique used to monitor the interplay between exciton/trion dynamics and electrocatalytic activity for two-dimensional transition metal dichalcogenides provides an excellent platform to investigate the local carrier behaviors at the atomic layer/liquid electrolyte interfaces during electrocatalytic reaction.

Original languageEnglish
Pages (from-to)4298-4307
Number of pages10
JournalACS Nano
Volume16
Issue number3
DOIs
StatePublished - 22 Mar 2022

Keywords

  • exciton dynamics
  • hydrogen evolution reaction (HER)
  • monolayer MoS
  • time-resolved microscopy
  • trion dynamics

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