A novel high performance flexible supercapacitor based on porous carbonized cotton/ZnO nanoparticle/CuS micro-sphere

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 584; p. 124025
• Main Authors: Zhai, Shixiong, Jin, Kaili, Zhou, Man, Fan, Zhuizhui, Zhao, Hong, Li, Xiaoyan, Zhao, Yaping, Ge, Fengyan, Cai, Zaisheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 02.01.2020
• Subjects: Binder-free electrodes; Carbonized cotton; Composite; Copper sulphide; Flexible and wearable supercapacitor; Zinc oxide; Carbonized cotton; Zinc oxide; Copper sulphide; Flexible and wearable supercapacitor; Composite; Binder-free electrodes
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2019.124025

A novel porous carbonized cotton/ZnO nanoparticles/CuS micro-spheres flexible composite electrode shows excellent electrochemical performances. [Display omitted] In this work, a novel flexible electrode composed of porous carbonized cotton, ZnO nanoparticles and CuS micro-spheres is prepared by two-step method. Benefitting from the synergistic effect of eletrochemical double layer capacitance and pseudo capacitance, the porous carbonized cotton/ ZnO/CuS composite (pCcZC) electrode shows excellent specific capacitance (1830 mF cm−2 at 2 mA cm−2), high rate performance (74% retention with the current density increasing from 2 to 10 mA cm−2) and outstanding cycle stability (14.8% loss of initial capacitance after 5000 cycles). The flexible and lightweight carbonized cotton as current collector directly makes the electrode binder-free, flexible and wearable. Additionally, the flexible symmetrical supercapacitor based on pCcZC electrodes achieves a superior energy density of 0.27 Wh cm−2 at 4.26 W cm−2, and can succesfully light the LED, which manifests its great applied potential in the new generation of portable and wearable energy storage devices.