Electrochemical properties of pyrolysed graphene/activated carbon composite doped with FeTMPP-Cl as electrode materials

摘要

The morphology and electrochemical properties of electrodes made from graphene (Gr)-activated carbon (AC) composite (GrAC) doped with iron(III) tetramethoxyphenylporphyrin chloride (FeTMPP-Cl), hereafter referred to as GrAC-FeTMPP-Cl, are investigated in this study. The properties of the modified electrodes are considerably improved by modifying carbon through the introduction of transition metal catalysts into the hybrid carbon matrix. The hybrid GrAC exhibits superior electrochemical properties than those of materials with single components. Incorporating AC into Gr nanosheets prevents the aggregation of the nanosheets because the AC particles distributed between the Gr layers provide numerous pathways for electron transfer. The addition of FeTMPP-Cl to the electrode material, followed by pyrolysis, enhances the material's electrochemical properties, including fast electron transfer, low charge transfer resistance and high redox current peaks, due to numerous accessible effective surface areas of the electrode. The pyrolysed GrAC-FeTMPP-Cl-modified electrode achieves the highest oxidation current peak of 0.088 mA, with an increment of 10.3% compared with GrAC (0.080 mA) at a scan rate of 20 mVs(-1) in 5 mM K-3 [Fe(CN)(6)]/0.1 M KCl electrolyte solution. Results demonstrate the high potential for applications of the pyrolysed GrAC-FeTMPP-Cl/indium tin oxide modified electrode in flexible energy storage devices.