Optimization of porous carbon nanofiber/MnO2 electrode-based supercapacitor performance using γ‑cyclodextrin: Effects of graphene and MnCl2 contents

Abstract

• Graphene and MnCl 2 content is optimized for supercapacitor performance of PCM(5)G(3). • PCM(5)G(3) has high surface area and active material of MnO 2 embedded in the fiber. • PCM(5)G(3) maximize the synergistic effect of the pseudocapacity and EDLC. • PCM(5)G(3) have great potential in electrochemical capacitor electrode materials. We systematically evaluate the influence of graphene and MnCl 2 contents on the structure and capacity of γ-cyclodextrin/graphene-based carbon nanofibers and MnO 2 (PCMG). The PCMG electrodes are stable long-term and had good capacitances, e.g., up to 236Fg -1 at 1mAcm -2 and 25.5Whkg -1 at 400Wkg -1 . The electrochemical performance is maximized by the synergistic effect between the pseudocapacity of MnO 2 well-embedded in the fiber and the electric double layer capacity induced by the well-developed surface pores.