Electrochemical Deposition of PEDOT/MXene Composite Films for Supercapacitor Electrodes

Abstract PEDOT is a kind of electrode material for supercapacitors due to its excellent thermal stability, good film-forming properties, and electrical conductivity. However, PEDOT generates large volume changes during charging and discharging, resulting in structural collapse and hampering electrochemical performance. MXene, as a two-dimensional layered nanomaterial, is able to act as a support for PEDOT and reduce its volume change. In this study, PEDOT/Ti 3 C 2 T x composite films were prepared on substrates by electrochemical deposition using cyclic voltammetry method and used as electrode materials for supercapacitors. The effects of different molar ratios of EDOT to PSSNa and the number of CV cycles of growth on the performance of PEDOT were investigated. It was found that the best performance of the prepared PEDOT was achieved when the number of CV cycles was 40 and the ratio of EDOT: PSSNa was 1:3. Under optimum experimental conditions, the PEDOT/Ti 3 C 2 T x was obtained by in-situ polymerization and its specific capacity was up to 41.55 mF cm −2 at a current density of 1 mA cm −2 .