Defective molybdenum sulfide quantum dots as highly active hydrogen evolution electrocatalysts
MoS2, quantum dots, defects, hydrogen evolution, ultrafast laser ablation
ABSTRACT Molybdenum disulfide (MoS2), a promising non-precious electrocatalyst for the hydrogen evolution reaction with two-dimensional layered structure, has received increasing attention in recent years. Its electrocatalytic performance has been limited by the low active site content and poor conductivity. Herein, we report a facile and general ultrafast laser ablation method to synthesize MoS2 quantum dots (MS-QDs) for electrocatalytic HER with fully exposed active sites and highly enhanced conductivity. The MS-QDs were prepared by ultrafast laser ablation of the corresponding bulk material in aqueous solution, during which they were partially oxidized and formed defective structures. The as-prepared MS-QDs demonstrated high activity and stability in the electrocatalytic HER, owing to their very large surface area, defective structure, abundance of active sites, and high conductivity. The present MS-QDs can also find application in optics, sensing, energy storage, and conversion technologies.
Tsinghua University Press
Gang Ou,Peixun Fan,Xiaoxing Ke,Yushuai Xu,Kai Huang,Hehe Wei,Wen Yu,Hongjun Zhang,Minlin Zhong,Hui Wu,Yadong Li, Defective molybdenum sulfide quantum dots as highly active hydrogen evolution electrocatalysts. NanoRes.2018, 11(2): 751–761