Synergistic Pt doping and phase conversion engineering in two-dimensional MoS2 for efficient hydrogen evolution
Publication Name
Nano Energy
Abstract
Molybdenum disulphide (MoS ) is proven to be a promising catalyst for hydrogen evolution reaction (HER), but the HER performance of reported MoS -based catalysts is still limited by its poor conductivity and low density of active sites. Herein, a Pt-doped MoS (Pt@MoS ) catalyst is synthesized by a potential-cycling method, which introduces the Pt dopant into the MoS lattice and achieves partial 2H to 1T phase conversion of MoS simultaneously. Benefitting from the optimized geometric and electronic structure of MoS , the Pt@MoS exhibits a low overpotential of 88.43 mV at 10 mA cm , which is decreased by two-thirds as compared to that of the pristine MoS . A comprehensive study reveals the position and the contribution of Pt atom in electronic structure modulation of MoS . Theoretical calculations further reveal that the S atom adjacent to the Pt in MoS acts as the most active site for HER, and possesses a small hydrogen adsorption free energy (∆G ) of ~ 0.04 eV, similar to the benchmark Pt catalyst. This study opens up a new avenue for designing MoS and other transition metal dichalcogenide-based electrocatalysts with enhanced HER performance, as well as providing in-depth understanding on the HER mechanism in external metal-activated MoS catalyst. 2 2 2 2 2 2 2 2 2 2 2 H* 2 2 −2
Open Access Status
This publication is not available as open access
Volume
84
Article Number
105898
Funding Number
201901171523
Funding Sponsor
Australian Nuclear Science and Technology Organisation