고효율 수소발생반응 촉매를 위한 전자빔으로 조사된 단일층 MoS2에 대한 연구

Abstract

Among the electrocatalytic water splitting hydrogen evolution reaction (HER) research, numerous studies have been currently carried out on the two-dimensional materials to an alternative for the non-precious catalysts, in which monolayer (ML) MoS2 has been considered to be an ideal candidate. On the other hand, thermal-dynamically stable MoS2 have a limit HER performance because of low density of active edge sites and poor conductivity. However, the electron beam treatment of MoS2 can potentially increase the density of active sites for enhancing the HER performance. In this work, we have adopted the electron beam to induce the defect on ML MoS2 confirmed through photoluminescence and Raman scattering. The pristine ML MoS2 was synthesized by the metal-organic chemical vapor deposition. The linear sweep curve and corresponding Tafel plot shows an strong improving HER performance for obtained treated sample, as its overpotential and Tafel slope much lower than that of pristine sample. Our research shows that the electron beam treatment is an effective route to defect on MoS2 flake and hence enhancing significantly electrocatalytic HER activity.