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Recent Advances in Understanding the Capacitive Storage in Microporous Carbons
Author(s) -
Daffos B.,
Taberna P.L.,
Gogotsi Y.,
Simon P.
Publication year - 2010
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200900192
Subject(s) - capacitance , microporous material , materials science , electrolyte , porosity , supercapacitor , nanometre , chemical engineering , ion , capacitive sensing , carbon fibers , nanotechnology , chemistry , composite material , organic chemistry , electrode , computer science , composite number , engineering , operating system
This paper presents a review of our recent work on capacitance of carbide‐derived carbons (CDCs). Specific capacitance as high as 14 μF cm –2 or 160 F g –1 was achieved using CDCs with tailored subnanometer pore size, which is significantly higher than 6 μF cm –2 or 100 F g –1 for conventional activated carbons. Such high capacitance was obtained in several types of organic electrolytes with or without solvent. A maximum is obtained for the carbons with the mean pore size close to the bare ion size, ruling out the traditional point of view that mesoporosity is highly required for maximum capacitance. Surprisingly, carbons with subnanometer porosity exhibit high capacitance retention, since only a 10% loss is measured when 6 A g –1 discharge is drawn. These findings show the importance of fitting the ion size with the mean pore size. The double layer theory falls short to explain such charge storage mechanisms at the nanometer scale; thus atomistic modelling is required to find out an alternative charge storage model.