Activated hierarchical porous carbon as electrode membrane accommodated with triblock copolymer for supercapacitors
作者：Fen Ran a,d,n, Kuiwen Shen a, Yongtao Tan a, Bowu Peng a, Shaohua Chen b,nn, Weijie Zhang c,
關鍵字：triblock copolymer， electrode membrane，supercapacitors
論文來源：期刊
發表時間：2016年
Homopolymer PAN and triblock copolymer PAN-b-PMMA-b-PAN synthesized by RAFT polymerization were used to fabricate activated hierarchical porous carbon membranes by combining phase inversion, carbonization, and HNO3 activation method; during the preparation process, a lot of micro- and mesopores generated because of phase separation of PAN and microphase separation of PAN-b-PMMA-b-PAN.The hierarchical porous structure shortened ions transport paths and facilitated the rapid migration of electrolyte ions. When the polymer membrane was prepared by the casting solution with 5 wt% of PANb-PMMA-b-PAN and the electrochemical performance was tested at the current densities from 0.5 to 5 A g1, a high-end specific capacitance of 297.0 F g1 and a capacitance retention of 75% were obtained in three-electrode configuration; this specific capacitance remained above 90% of initial value after 2000cycles at 2 A g1 in 6 M KOH aqueous solution. Moreover, symmetric supercapacitors assembled with the prepared materials achieved high energy density (15.8 Wh Kg1) and power density (4000 W Kg1) in 1 M Na2SO4 solution. The unique features and structures endowed the electrode membrane with good capacitive performance in both three-electrode and two-electrode configuration, which can be used as electrode membranes for high-performance energy storage devices and other applications.