High-quality rGO/MoS2 composite via a facile "prereduction-microwave" strategy for enhanced lithium and sodium storage

High-quality graphene and graphene-based composites with optimized conductivity and surface chemistry state are crucial to the practical application in electrochemical energy storage and conversion systems. Here, we first propose a facile and general "prereduction-microwave" strategy to repair the lattice defects of reduced graphene oxides composites just in a few seconds, particularly, which has been successfully carried out on rGO/MoS2 composite previously synthesized through the hydrothermal method. This post repaired strategy not only can effectively improve the conductivity of graphene framework, but also well preserve the structural properties of graphene-based composites. Therefore, the optimized rGO/MoS2 composite achieves improved conductivity, good wettability, short ion diffusion length and excellent structural stability compared to the untreated rGO/MoS2 composite, which presents desirable capacity of 734 mAh g(-1) for 200 cycles at 0.5 A g(-1) and 335 mAh g(-1) for 100 cycles at 1 A g(-1) for lithium ion and sodium ion storage, respectively. This method will further promote the development of graphene-based materials for efficient energy storage and conversion. (C) 2019 Elsevier B.V. All rights reserved.