Abstract:

In this study, PPy/SbOx-SnO2 composite-coated graphite electrode was prepared for the supercapacitor anode by simultaneous electrochemical synthesis of PPy, nano-SbOx, and nano-SnO2 in TBABF4/acetonitrile solution containing pyrrole (Py), Sb(BF4)3, and Sn(BF4)2. The electrochemical properties of the composite, which was synthesized by multi-scan cyclic voltammetry on the pencil graphite electrode surface, were investigated in aqueous 100 mM H2SO4 solution using CV, GCD, and EIS methods by comparing them with that of the PPy homopolymer prepared in the same way. The specific capacitance of the PPy/SbOx-SnO2 composite-coated electrode was 363.1 F g-1 at 5 A g-1, while that of the PPy-coated electrode was 304.7 F g-1. The composite synthesized on the graphite plate surface was characterized using FESEM, EDX, XRD, and XPS techniques. The asymmetric supercapacitor cell was prepared in polyvinyl alcohol (PVA)/H2SO4 gel electrolyte using the PPy/SbOx-SnO2/CMC composite coating on the graphite paper surface as the active anode material and the activated carbon-based coating on the graphite paper surface as the active cathode material. Here, the PPy/SbOx-SnO2 composite was synthesized in the presence of CMC (carboxymethyl cellulose in order to increase its mechanical strength. The cell exhibited an energy density of 15.3 Wh kg-1 and a power density of 1.77 kW kg-1 at 2.5 A g-1.

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