Zhang Yingying, Zhang Hui, Ming Shouli, Lin Peicheng, Yu Ruixuan, Xu Ting
National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
ACS Appl Mater Interfaces. 2024 May 1;16(17):22571-22579. doi: 10.1021/acsami.4c02684. Epub 2024 Apr 19.
Conducting polymer (CP)-based supercapacitors show great promise for applications in the field of wearable and portable electronics. However, these supercapacitors face persistent challenges, notably low energy density and inadequate stability. In this study, we introduce a polythiophene derivative, designated as poly(EPE), synthesized via the electrochemical polymerization of 8-bis(2,3-dihydrothieno[3,4-][1,4]dioxin-5-yl)-3,3-dimethyl-3,4-dihydro-2-thieno[3,4-][1,4]dioxepine (EPE). The resulting poly(EPE) polymer exhibits an exemplary 3D porous network-like structure, significantly enhancing its capacitance performance. When employed as the electrode material, the symmetric supercapacitor demonstrates an exceptionally high specific capacitance of 1342 F g at a current density of 4.0 A g, along with impressive energy and power densities of 119.3 W h kg and 38.83 kW kg, respectively. These capacitance values surpass those of previously reported pristine CP-based supercapacitors. Notably, the supercapacitor showcases outstanding stability, maintaining a retention rate of 92.5% even after 50,000 charge-discharge cycles. These findings underscore the substantial potential of poly(EPE) as an electrode material for the advancement of the supercapacitor technology.
