Battery-type graphene/BiOBr composite for high-performance asymmetrical supercapacitor

Battery-type electrode materials are utilised in high performance supercapacitors. Herein, graphene/ BiOBr (GR/BiOBr) composite is prepared by one-step solvothermal method and firstly used in supercapacitors. The results of the dynamic calculations suggest that the key feature of the GR/BiOBr composite is its battery-like performance. When used as an electrode in a three-electrode system, the GR/BiOBr composite can deliver an excellent specific capacity of 491 Cg(-1) at 1 Ag-1. An asymmetrical supercapacitor cell with a voltage of 1.4 V for the aid of GR/BiOBr (negative electrode) and Ni-Co-Al LDH (positive electrode) is assembled. The symmetrical supercapacitor achieves a high energy density of 29.2 Wh kg(-1) corresponding to a power density of 700 W kg(-1). This study shows that GR/BiOBr composite has a great potential for high performance supercapacitors. (C) 2019 Elsevier B.V. All rights reserved.