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Self‐template synthesis of hierarchical porous carbon for supercapacitors based on bituminous coal
Author(s) -
Wang Xing,
Qin Zhihong,
Yang Xiaoqin,
Chen Qiang,
Lin Zhe
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5905
Subject(s) - supercapacitor , solvent , bituminous coal , electrolyte , chemical engineering , porosity , electrochemistry , coal , carbon fibers , template , materials science , specific surface area , chemistry , nanotechnology , catalysis , electrode , organic chemistry , composite material , composite number , engineering
Summary We develop a unique self‐template method to synthesize hierarchical porous carbons (HPCs) by co‐activation of heavy component (HC) and dense medium component (DMC) separated from bituminous coal. HC and DMC are obtained by employing the mixture solvent (CS 2 /N‐methyl‐2‐pyrrolidone) and deionized water as extractant and back extractant to separate bituminous coal. The plentiful kaolinite [Al 2 (Si 2 O 5 ) (OH) 4 ] in the HC produce Natrolite (K) (K 2 Al 2 Si 3 O 10 •2H 2 O) during the activation process, which can serve as self‐template to prepare HPCs. Moreover, the addition of asphalt‐like DMC allows the templates to be better utilized. Effect of the remixture ratio of DMC/HC on HPCs' porous structures and electrochemical properties are studied in detail. The optimal sample (HPC‐0.4) displays an ultrahigh surface area (3851 m 2 g −1 ), appropriate hierarchically system and excellent conductivity. When applied to supercapacitors, HPC‐0.4 delivers a large capacity of 436 F g −1 at 0.1 A g −1 in alkaline electrolyte, and maintains 212 F g −1 at 10 A g −1 . This self‐template strategy paves a practical route to construct applicable porous carbons for supercapacitors from low‐cost high‐minerals coal.