Sudhakar, Y N and Cortiñas, Sara Méndez and Selvakumar, M (2019) Sequential layer-by-layer engineered polypyrroleactivated carbon multilayer films: high-energy composite electrode materials for symmetrical supercapacitors. Materials Technology, 34 (3). pp. 126-134. ISSN 1066-7857

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Abstract

Multilayer polypyrrole (PPy))/Activated carbon (AC) composite electrode was potentiostatically prepared on the surface of stainless steel. Numbers of layers were optimized with p-toluene sulphonic acid, benzene sulphonic acid, and camphor sulphonic acid, as concerned with the accessibility of monomers and high capacitance. Surface morphology of successive deposition of PPy/AC layers were observed using SEM and AFM. The performances of each layer have been studied using cyclic voltammetry and AC impedance spectroscopy. The first layer showed specific capacitance of 345 F g−1, whereas in the multilayered film it was 658 F g−1. Symmetrical supercapacitor were fabricated using multilayer electrodes and compared with single layer electrodes. The properties of supercapacitor showed specific capacitance of 557 F g−1 in a multilayer based supercapacitor, and charge-discharge studies showed excellent stability at the different current density in 0.1M H2SO4. Hence, the study provides evidence and scope for using multilayer with optimized materials and electrochemical conditions.

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