Flexible polypyrrole/TiO2/MXene nanocomposite supercapacitor: A promising energy storage device
Elmira Azizi, Jalal Arjomandi, Hu Shi, Mohammad Ali Kiani
Abstract
Design and development of flexible and high-performance supercapacitors is deemed necessary for portable and wearable electronic devices. In this study, a flexible and high performance PPy/TiO 2 /Ti 3 C 2 T X nanocomposite film as a negative electrode was prepared by electrochemically deposition of PPy/TiO 2 on the carbon cloths (CC) as substrate. Then, the prepared PPy/TiO 2 nanocomposite film was dipped repeatedly into the few-layered Ti 3 C 2 T X nanosheet solution to electrode exhibits a high areal capacitance of 472.0 mF cm −2 at a current density of 3.0 mA cm −2 and outstanding cycling stability of 84 % capacitance retention after 10,000 cycles. Furthermore, an asymmetric supercapacitor was assembled by combining PPy/TiO 2 /Ti 3 C 2 T X as the negative electrode and acid-treatment carbon cloth (TCC) as the positive electrode to increase the potential window of the system. The device exhibited a remarkable specific capacitance of 191.4 mF cm −2 at 1.0 mA cm −2 an excellent energy density of 1.2 mWh cm −3 at a power density of 23.1 mW cm −3 , as well as excellent power density of 41.5 mW cm −3 at 0.12 mWh cm −3 , and the capacitance retention of 87 % after 13,000 cycles, indicating that the PPy/TiO 2 /Ti 3 C 2 T X nanocomposite film has great potential as an electrode for fabrication of asymmetric supercapacitor .