Large scale flexible solid state symmetric supercapacitor through inexpensive solution processed V2O5 complex surface architecture

•The porous V2O5 intermixed flakes were synthesized by chemical method.•High specific capacitance 735 F g−1 of V2O5 electrode with long cycling stability.•Formation of FASC device with the help of LiClO4-PVA gel electrolyte.•Superior electrochemical performance of FASC device.

Complex nanostructured morphology of V2O5 has been grown on pliable stainless steel substrate (SS) through simple and inexpensive chemical bath deposition (CBD) for all-solid state flexible supercapacitor (SC). The structure and morphology of the synthesized V2O5 thin films revealed the formation of intermixed flakes. High specific capacitance of 735 F g−1 (at scan rate of 1 mV s−1) of V2O5 through liquid configuration motivated us to form complete flexible all-solid state symmetric supercapacitor (FASC) device. Remarkable specific capacitance of 358 F g−1. With 1.8 V wide potential window and high value of capacitive retention of 88% over 1000 cycles has been achieved for FASC. Furthermore, the origin of capacitive behavior from dual contributions of surface-controlled and diffusion-controlled charge components has been evaluated to identify the dominating nature in electrochemical reactions. As practical applicability, pliability of electrode has been tested at 175° bending angle along with the integration to large scale electrode dimension (11 ×4 cm2).

Graphical abstractFabrication of flexible all-solid state symmetric supercapacitor (FASC) device using V2O5 electrodes having intermixed flakes like morphologyDownload high-res image (178KB)Download full-size image