Halogen-functionalized triazine-based organic frameworks towards high performance supercapacitors

被引:43
|
作者
Gao, Yun [1 ]
Zhi, Chuanwei [1 ]
Cui, Panpan [1 ]
Zhang, Kai A. I. [2 ]
Lv, Li-Ping [1 ]
Wang, Yong [1 ,3 ]
机构
[1] Shanghai Univ, Sch Environm & Chem Engn, Dept Chem Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China
[2] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany
[3] Shanghai Univ, Key Lab Organ Compound Pollut Control Engn, Minist Educ, 99 Shangda Rd, Shanghai 200444, Peoples R China
基金
中国国家自然科学基金;
关键词
Covalent triazine-based organic frameworks; Fluorination; Halogen-functionalization; Supercapacitors; POLYMER NETWORKS; COVALENT; CO2; CRYSTALLINE; NANOSHEETS; CARBON;
D O I
10.1016/j.cej.2020.125967
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Covalent triazine-based frameworks (CTFs) are promising capacitive storage polymers due to their porosity and structural controllability at the molecular or atomic level. However, the intrinsic low electron/ion conductivity and severe stacking effect between adjacent layers greatly impede their electrode performance in supercapacitors. Herein, we deploy a halogen-functionalized strategy to promote the electrochemical performances of CTFs. Theoretical calculation indicates a lower energy gap (E-gap) of the halogen-functionalized CTF, implying facilitated electron transportation process and decreased internal resistance. Halogen-substitution is believed to further "lock" the interlayer space of two adjacent CTFs layers due to their atomic repelling effects which is benefit for the charge transfer process. A hierarchical micro-/mesoporous property results in a large specific surface area (S-BET similar to 1345 m(2)g(-1)) with abundant channels to the charges and electrons, thus providing more double layer capacitance to the CTFs. Consequently, among all the as-synthesized CTFs, the fluorinated CTF, L e. FCTF possesses the highest energy storage capacitance of 379 F g(-1) at 1 A g(-1), excellent cycling stability (96.8%) and high Coulombic efficiency (up to 99.6%) after 10,000 cycles at 5 A g(-1). FCTF (cathode) and activated carbon (anode) are then assembled into an asymmetric supercapacitor (ASC) which reaches a fine capacitance (148 F g(-1)) at 1 A g(-1).
引用
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页数:11
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