Metal dichalcogenide-based 2D materials,gained considerable attention recently as a hydrogen evolution reaction(HER)electrocatalyst.In this work,we synthesized MoSe_(2)-based electrocatalyst via hydrothermal route wit...Metal dichalcogenide-based 2D materials,gained considerable attention recently as a hydrogen evolution reaction(HER)electrocatalyst.In this work,we synthesized MoSe_(2)-based electrocatalyst via hydrothermal route with varying phase contents(1T/2H)and respective HER performances were evaluated under the acidic media(0.5 M H_(2)SO_(4)),where best HER performance was obtained from the sample consisting of mixed 1T/2H phases,which was directly grown on a carbon paper(167 mV at10 mA cm^(-2))Furthermore,HER performance of electrocatalyst was further improved by in-situ electrodeposition of Pt nanoparticles(0.15 wt%)on the MoSe_(2) surface,which lead to significant enhancement in the HER performances(133 mV at 10 mA cm^(-2)).Finally,we conducted density functional theory calculations to reveal the origin of such enhanced performances when the mixed 1T/2H phases were present,where phase boundary region(1T/2H heterojunction)act as a low energy pathway for H_(2)adsorption and desorption via electron accumulation effect.Moreover,presence of the Pt nanoparticles tunes the electronic states of the MoSe_(2)based catalyst,resulting in the enhanced HER activity at heterointerface of 1T/2H MoSe_(2) while facilitating the hydrogen adsorption and desorption process providing a low energy pathway for HER.These results provide new insight on atomic level understanding of the MoSe_(2) based catalyst for HER application.展开更多
基金supported by the GRRC program of Gyeonggi Province(GRRC Sungkyunkwan 2023-B01)the support of Korea Institute of Energy Technology Evaluation and Planning(KETEP)and the Ministry of Trade,Industry&Energy(MOTIE)of the Republic of Korea(No.20224000000100)the research support of KENTECH foundation research grant supported by MOTIE。
文摘Metal dichalcogenide-based 2D materials,gained considerable attention recently as a hydrogen evolution reaction(HER)electrocatalyst.In this work,we synthesized MoSe_(2)-based electrocatalyst via hydrothermal route with varying phase contents(1T/2H)and respective HER performances were evaluated under the acidic media(0.5 M H_(2)SO_(4)),where best HER performance was obtained from the sample consisting of mixed 1T/2H phases,which was directly grown on a carbon paper(167 mV at10 mA cm^(-2))Furthermore,HER performance of electrocatalyst was further improved by in-situ electrodeposition of Pt nanoparticles(0.15 wt%)on the MoSe_(2) surface,which lead to significant enhancement in the HER performances(133 mV at 10 mA cm^(-2)).Finally,we conducted density functional theory calculations to reveal the origin of such enhanced performances when the mixed 1T/2H phases were present,where phase boundary region(1T/2H heterojunction)act as a low energy pathway for H_(2)adsorption and desorption via electron accumulation effect.Moreover,presence of the Pt nanoparticles tunes the electronic states of the MoSe_(2)based catalyst,resulting in the enhanced HER activity at heterointerface of 1T/2H MoSe_(2) while facilitating the hydrogen adsorption and desorption process providing a low energy pathway for HER.These results provide new insight on atomic level understanding of the MoSe_(2) based catalyst for HER application.
