Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 125, Issue -, Pages 57-63Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2018.10.012
Keywords
Nanoporous carbon; N-doping; Metal-organic framework; Supercapacitor; Hierarchical structure
Funding
- National Key R&D Program of China [2017YFD0601006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Youth Fund of Natural Science Foundation of Jiangsu Province [BK20170919]
- Scientific Research Foundation for Returned Scholars from Nanjing Forestry University [GXL2018014]
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ZIF-8 wrapped two-dimensional ZIF-L(Co) was prepared. By adjusting the Zn2+ concentration in precursor, ZIF8 layer with different thickness was coated onto sheet-like ZIF-L. After carbonization, hierarchical porous carbon with CNTs wrapping was formed. Proper ZIF-8 coating would result in the porous carbon with relative high BET surface area, N content, electrical conductivity and proper pore size distribution; thus showing higher super capacitive performance than that of carbonized ZIF-8 or carbonized ZIF-L. The highest specific capacitance is 274 F/g for carbonized composite materials compared to that of 220 F/g for carbonized ZIF-8 and 57 F/g for carbonized ZIF-L. Moreover, such composite sample (CZ-6) showed high stability and the energy density reached 6.99 W h/kg at a power density of 0.262 kW/k, which is better than most of other ZIF-based porous carbon reported before.
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