Fig xA XRD patterns a and Raman

With the rapid development of modern electronic industry and the increasingly serious issue of environmental pollution, the demands for high-performance, efficient, and environmental-friendly energy storage devices have greatly increased [1], [2], [3], [4] and [5]. Supercapacitors, also called electrochemical capacitors, have emerged as a promising candidate to satisfy increasing power demands due to the advantages of low cost, high power density, fast charge-discharge rate and long CHIR-265 life.