Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte
Tian Xie, Jinxiao Xu, Jie Wang, Chuanli Ma, Linghao Su, Feng‐Ying Dong, Liangyu Gong
Abstract
A facile approach of hydrothermal was proposed to fabricate direct synthesis of the bimetallic sulfide (CuCo2S4) on carbon cloth (CC) without binders for supercapacitors electrodes, and proposed a possible formation mechanism. The prepared CuCo2S4/CC exhibits high SC of 1312 F· g -1 at 1 A· g -1and an excellent capacitance retention of 94% at 5 A· g -1 over 5000 cycles. In addition, the asymmetric supercapacitor (CuCo2S4/CC//AC/CC) exhibits energy density (42.9 wh· kg -1 at 0.8 kW· kg -1 ) and outstanding cycle performance (80% initial capacity retention after 5000 cycles at 10 A· g -1 ). Meanwhile, the electrochemical performance of supercapacitor device is still quite stable at different angles of bending. Two charged device in series can light 28 red color LED's (2 V) for 5 minutes. This all indicates that the prepared CuCo2S4 has potential application value.