The Enhanced Supercapacitive Performance of the Hybrid Material Integrating Doped-Polymer with the Composite of Graphene Oxide and Mn₃O₄

Highlights: • A new supercapacitive material by integrating conjugated polymers with the composite of graphene oxide and Mn₃O₄ has been synthesized. • The photopolymerization method establishes the interaction in the ternary composite materials. • The conjugated polymers in the doped GPM composite are efficiently doped by HCl solution, thus improving the conductivity of hybrid materials. • The as-prepared material shows the enhanced supercapacitive properties with high specific capacitance and long-term charge-discharge cycling stability. - Abstract: We synthesize a new supercapacitive material by integrating conjugated polymers with the composite of graphene oxide (GO) and Mn₃O₄ through photopolymerization. The GO-conjugated polymer composite is prepared via in situ photopolymerization of Pyrrole and 3,4-ethylenedioxythiophene on the surface of GO, followed by the hydrothermal synthesis of Mn₃O₄ to obtain GO-Polymer-Mn₃O₄ (GPM). In order to optimize the supercapacitive performance of GPM, the GO-conjugated polymer composite is doped by HCl solution to improve the conductivity of the doped GPM composite. The structures of the composites are characterized using transmission electron microscopy, selected-area electron diffraction, field-emission scanning electron microscopy, fourier transform infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller. The supercapacitive properties of the doped GPM composite are investigated using different electrochemical techniques including cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The doped GPM electrode shows a high specific capacitance and long-term charge-discharge cycling stability.