Fabrication of Flexible Supercapacitor Using Spray‐Coated Ti <sub>3</sub> C <sub>2</sub> T <sub> <i>x</i> </sub> MXene Thin Film
Varsha Vijayan, Anamika Ashok, Asha Arackal Sukumaran, Oleksii Klymov, C. Martínez‐Tomás, Saı̈d Agouram, V. Muñoz‐Sanjosé, Mahesh Eledath Changarath, Juan F. Sánchez‐Royo
Abstract
Fabrication of a flexible symmetric supercapacitor with an areal capacitance of 28.40 mF cm −2 using spray‐coated Ti 3 C 2 T x MXene thin film is reported here. Ti 3 C 2 T x MXene thin films are successfully deposited by a spray coating method on a flexible polymer substrate. The thin films exhibit a significant d spacing of 1.54 nm, and the conductivity of the films increases with spray time up to a maximum of 2.32 × 10 4 S m −1 giving an areal capacitance of 62.15 mF cm − 2 at a 5 mV s −1 scan rate. The thin film shows capacitive character with 93% of its total charge from capacitive contribution, at a scan rate of 100 mV s −1 . The structural and morphological analysis confirms the formation of large Ti 3 C 2 T x flakes, contributing to enhanced conductivity and electrochemical response. An all‐solid‐state symmetric supercapacitor developed using the optimized thin films as the electrodes and PVA‐H 2 SO 4 gel polymer as the electrolyte gives an energy density of 2.52 μWh cm −2 and a power density of 105.20 μW cm −2 at a current density of 1 mA cm −2 .