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A New Approach to Tuning Carbon Ultramicropore Size at Sub‐Angstrom Level for Maximizing Specific Capacitance and CO 2 Uptake
Author(s) -
Zhou Jin,
Li Zhaohui,
Xing Wei,
Shen Honglong,
Bi Xu,
Zhu Tingting,
Qiu Zhipeng,
Zhuo Shuping
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201601904
Subject(s) - materials science , electrolyte , ion , capacitance , carbon fibers , alkali metal , angstrom , molecule , chemical engineering , supercapacitor , ionic liquid , nanotechnology , chemistry , crystallography , electrode , composite material , organic chemistry , composite number , engineering , catalysis
Ultramicroporous carbon materials with uniform pore size accurately adjusted to the dimension of electrolyte ions or CO 2 molecule are highly desirable for maximizing specific capacitance and CO 2 uptake. However, efficient ways to fine‐tuning ultramicropore size at angstrom level are scarce. A completely new approach to precisely tuning carbon ultramicropore size at sub‐angstrom level is proposed herein. Due to the varying activating strength and size of the alkali ions, the ultramicropore size can be finely tuned in the range of 0.60–0.76 nm as the activation ion varies from Li + to Cs + . The carbons prepared by direct pyrolysis of alkali salts of carboxylic phenolic resins yield ultrahigh capacitances of up to 223 F g ‐1 (205 F cm ‐3 ) in ionic liquid electrolyte, and superior CO 2 uptake of 5.20 mmol g ‐1 at 1.0 bar and 25 °C. Such outstanding performance of the finely tuned carbons lies in its adjustable pore size perfectly adapted to the electrolyte ions and CO 2 molecule. This work paves the way for a new route to finely tuning ultramicropore size at the sub‐angstrom level in carbon materials.