Graphene-Based Electrode Materials for High-Performasnce Supercapacitors

Abstract

The growing demand for efficient energy storage has driven interest insupercapacitors, which offer high power density and long cycle life, and theperformance of a supercapacitor depends strongly on its electrode material.Graphene, a two-dimensional carbon nanomaterial of high surface area andconductivity, is a promising electrode material, and its study is an importantapplication of nanotechnology in energy engineering. This paper investigatesgraphene-based electrode materials for high-performance supercapacitors.Electrodes were fabricated from graphene and, for comparison, fromconventional activated carbon, and their electrochemical performance wasevaluated through the specific capacitance, energy and power density, andcycling stability. The results show that the graphene electrode delivered amarkedly higher specific capacitance than the activated carbon electrode,retained a greater proportion of its capacitance at high scan rates, andachieved higher energy and power densities with excellent capacitanceretention over repeated cycling. The superior performance is attributed to the high surface area, conductivity, and accessible structure of the graphene. The study demonstrates that graphene is an effective electrode material for high-performance supercapacitors.  KEYWORDS: Graphene, Supercapacitor, Electrode Material, SpecificCapacitance, Energy Storage, Nanomaterials, Electrochemistry