Carbon quantum dots intercalated in polypyrrole (PPy) thin electrodes for accelerated energy storage

Polypyrrole (PPy) and carbon quantum dots (CQDs) based composite electrodes (PPy/CQDs or PQDs) are designed through one step electro-polymerization technique in aqueous solution for energy storage pur poses. Composite electrode, thus obtained exhibits good electrochemical properties due to dotted CQDs structure comprising of high surface area with numerous active sites. Electrical conductivity of PPy was improved noticeably after modifying with CQDs. The charge transfer resistance (Rp) diminishes from 2.7 Omega to 0.11 Omega for PQD composite due to fast charge diffusion. The impact of varied concentration of CQDs was also evaluated for optimizing the electrochemical behavior of PQDs composites and PPy: CQDs as 95: 5 w/w ratio designated as PQD 0.5 was found to be the most effective composition. Various electrochemical properties of PQDs are also correlated at different time intervals to get an effective electropolymerized output and observed that PQD 0.5 composition processed for 30 min (PQD 30) demonstrates high specific capacitance of 1073.5 F/g at a scan rate of 10 mV/s and mass loading with 1.4 g/cm(2) of the optimized composite with a good cyclic stability as 62% even after 20 0 0 cycles of charge/discharge for the electrode. (C) 2020 Elsevier Ltd. All rights reserved.