Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 23, Pages 19871-19880Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03431
Keywords
ZIF-8; N-doped porous carbon polyhedrons; carbon nanosheets; hierarchical nanostructure; supercapacitors
Funding
- Fundamental Research Funds for the Central Universities [17D110606]
- National Natural Science Foundation of China [51433001, 21504012, 51773035]
- Program of Shanghai Subject Chief Scientist [17XD1400100]
- Natural Science Foundation of Shanghai [17ZR1439900]
- Shanghai Rising-Star Program [18QA1400200]
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Interconnected close-packed nitrogen-doped porous carbon polyhedrons (NCPs) confined in two-dimensional carbon nanosheets (CNSs) have been prepared through a sustainable one-pot pyrolysis of a simple solid mixture of zeolitic imidazolate framework-8 (ZIF-8) crystals and with organic potassium as the precursors. The hierarchically organized framework of the NCP-CNS composites enables NCPs and CNSs to act as well-defined electrolyte reservoirs and mechanical buffers accommodating large volume expansions of NCPs, respectively. Among the unique composite nanostructures, the NCPs with vast micropores provide electric double-layer capacitances, while the CNSs bridge the individual NCPs to form a conductive pathway with a hierarchical porosity. As a result, the NCP - CNS composites with high electrical integrity and structural stability are used as electrode materials for high-performance supercapacitors, which exhibit excellent electrochemical capacitive characteristics in terms of an outstanding capacitance of 300 F g(-1 )at 1 A g(-1) large energy density of 20.9 W h kg(-1), and great cycling performance of 100% retention after 6000 cycles. This work therefore presents a one-pot and efficient strategy to prepare an ordered arrangement of ZIF-8-derived porous carbons toward new electrode materials in promising energy storage systems.
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