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Electric Double‐Layer Capacitors Based on Highly Graphitized Nanoporous Carbons Derived from ZIF‐67
Author(s) -
Torad Nagy L.,
Salunkhe Rahul R.,
Li Yunqi,
Hamoudi Hicham,
Imura Masataka,
Sakka Yoshio,
Hu ChiChang,
Yamauchi Yusuke
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201400089
Subject(s) - supercapacitor , materials science , nanoporous , carbonization , zeolitic imidazolate framework , capacitance , cyclic voltammetry , specific surface area , chemical engineering , capacitor , electrode , electrochemistry , electrical resistivity and conductivity , carbon fibers , nanotechnology , composite material , adsorption , scanning electron microscope , chemistry , voltage , organic chemistry , metal organic framework , composite number , engineering , quantum mechanics , catalysis , physics , electrical engineering
Nanoporous carbons (NPCs) have large specific surface areas, good electrical and thermal conductivity, and both chemical and mechanical stability, which facilitate their use in energy storage device applications. In the present study, highly graphitized NPCs are synthesized by one‐step direct carbonization of cobalt‐containing zeolitic imidazolate framework‐67 (ZIF‐67). After chemical etching, the deposited Co content can be completely removed to prepare pure NPCs with high specific surface area, large pore volume, and intrinsic electrical conductivity (high content of sp 2 ‐bonded carbons). A detailed electrochemical study is performed using cyclic voltammetry and galvanostatic charge–discharge measurements. Our NPC is very promising for efficient electrodes for high‐performance supercapacitor applications. A maximum specific capacitance of 238 F g −1 is observed at a scan rate of 20 mV s −1 . This value is very high compared to previous works on carbon‐based electric double layer capacitors.