Redox-etching induced porous carbon cloth with pseudocapacitive oxygenic groups for flexible symmetr

• 作 者: Xu Han Zi-Hang Huang Fanjin Meng Baohua jia Tianyi Ma
• 机 构: Institute of Clean Energy Chemistry,Key Laboratory for Green Synthesis and Preparative Chemistry of
• 出 处: 能源化学
• 发表日期: 2022年1期
• 关键词: Porous carbon fiber Hierarchical pores Oxygenic groups Wide potential window Hig

Constructing high-performance electrodes with both wide potential window (e.g.≥ 2 V in aqueous elec-trolyte) and excellent mechanical flexibility represents a great challenge for supercapacitors.Because of the outstanding conductivity and flexibility,carbon cloth (CC) has shown unlimited prospects for con-structing flexible electrodes,but is rarely used directly as electrode material due to its electrochemical inertness and small specific surface area.To tackle these two critical limitations,we design a novel redox-etching strategy to synthesize CC-based electrode with 3D interconnecting pore structure.The sponge-like highly porous CC was further activated by strong oxidant to form abundant oxygenic groups,which occupy the interior and surface of current collector to render substantial pseudocapacitance.The as-synthesized CC electrode yielded an impressive capacitance of 4035 mF cm-2 at 3 mA cm-2 and sat-isfying cycling durability in a wide potential range of-1-1 V vs.SCE,which surpass the majority of reported CC-based electrodes.A symmetric supercapacitor with stable voltage of 2 V is assembled and delivers remarkable energy density of 6.57 mWh cm-3.Significantly,the device demonstrates an unpar-alleled flexibility with no capacitive decay after 100 bending cycles.This facile chemical etching and post-treatment processes are designed for large-scale manufacturing of the CC electrodes by providing high surface area and abundant electrochemically active sites,promising for industry application.The innova-tive synthetic strategy opens up new opportunities for high-performance flexible energy storage.