▎ 摘　　要

Metallic (1T)-transition metal dichalcogenides is of excellent optical and electrical properties and so especially suitable for various applications including hydrogen evolution catalysis, electronics, and photoelectrons. To date, achieving 1T-MoS2 nanosheets with a simple chemical process still is a challenge. Here we report a hydrothermal synthesis of the 1T-MoS2 nanosheets by incorporating reduced graphene oxide (RGO) or using citric acid/slow successive heating. A small amount of RGO induced the formation of pure 1T-MoS2 nanosheets. Citric acid/slow successive heating induced the formation of 1T-MoS2 nanosheets with a small amount of 2H-MoS2. Citric acid/slow successive heating also resulted in smaller average particle size in the present of RGO. Synthesized 1T-MoS2 nanosheets and RGO/1T-MoS2 nanosheet hybrids showed remarkably enhanced conduction and wettability compared with their semiconductor (2H)-nanostructures. Thus, dramatically enhanced hydrogen evolution catalytic activity and stability compared with the 2H-nanostructures were observed. RGO/1T-MoS2 nanosheet hybrids synthesized by incorporating graphene oxide and using citric acid/slow successive heating exhibited greatest photocatalytic activity (71.2 mmol/g.h) and electrocatalytic activity (onset potential of -15 mV vs. reversible hydrogen electrode and Tafel slopes of 43 mV/decade). These facile processes might also be significant for the synthesis and application of other 1T-transition metal dichalcogenides nanosheets and their hybrids with RGO. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.