Hierarchical architecture of coupling graphene and 2D WS2 for high-performance supercapacitor

A hierarchical architecture of coupling graphene and 2D WS2 for high-performance supercapacitors is fabricated by a facile ice-template approach. The hybridization content of WS2 in graphene architecture strongly affects the morphology structure and surface chemical nature of the electrode, and can significantly enhance electrochemical behaviors. As proposed, the hierarchical WS2/graphene architectures (WGA) showing rough and wrinkled surface can facilitate electrolyte diffusion and increase the wettability during the measurement. Meanwhile, the formation of 1T WS2 and covalent bonds at WS2/graphene interface are component for the improvement of pseudocapacitive behavior of WGA; A high performance like a superior specific capacitance (383.6 F g(-1)), good rate capability (79.9%) and excellent cyclic stability (102.5%) is found due to the fast proton insertion into the WS2 nanoflakes. This work provides an efficient and facile strategy to construct the hierarchical architectures for pseudocapacitive capacitors. (C) 2018 Elsevier Ltd. All rights reserved.