A flexible solid-state supercapacitor based on graphene/polyaniline paper electrodes

• 作者: Jintao Zhang Kang Li Song Chen Wei Pan Xuanli Liu
• 来源期刊: 能源化学
• 年，卷（期）: 2019,（5）
• 页码范围: 166-173
• 页数: 8页
• 语种: 英文

摘要

The direct coating of graphene sheets obtained by electrochemical exfoliation on commercial paper ren- ders the preparation of highly conductive flexible paper substrate for subsequent deposition of polyani- line (PANi) nanorods via electrochemical polymerization. The deposition of PANi can be well-controlled by adjusting the electrochemical polymerization time, leading to the formation of PANi coated graphene paper (PANi-GP). The as-prepared electrode exhibited high areal capacitance of 176 mF cm ? 2 in three- electrode system at a current density of 0.2 mA cm ? 2 , which is around 10 times larger than that of pris- tine graphene paper due to the pseudocapacitive behavior of PANi. In-situ Raman test was used to de- termine the molecular changes during redox process of PANi. More importantly, all-solid-state symmetric capacitor assembled with two PANi-GP electrodes in a polymer electrolyte delivered an areal capacitance of 123 mF cm ? 2 , corresponding to an areal energy density of 17.1 μWh cm ? 2 and an areal power density of 0.25 mW cm ? 2 . The symmetric capacitor held a capacitive retention of 74.8％ after 500 bending tests from 0 to 120 °, suggesting the good flexibility and mechanical stability. These results showed the great promising application in flexible energy-storage devices.