Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 43, Pages 11185-11192Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801869
Keywords
carbon nanoribbons; mesopore; micropore; supercapacitor; ZIF-8 nanoribbons
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Funding
- City University of Hong Kong [SRG 7004650]
- Research Grants Council of Hong Kong [CityU 11306717]
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ZIF-8 nanoribbons, with tunable morphology and pore structure, were synthesized by using the tri-block co-polymer Pluronic F127 as a soft template. The as-synthesized ZIF-8 nanoribbons were converted into carbon nanoribbons by thermal transformation with largely preserved morphology and porosity. The resulting carbon nanoribbons feature both micro- and meso-pores with high surface areas of over 1000 m(2) g(-1). In addition, nitrogen-doping in the carbon nanoribbons was achieved, as confirmed by XPS and EELS measurements. The hybrid carbon nanoribbons provide pseudo-capacitance that promotes electrochemical performance, rendering a high specific capacitance of up to 297 Fg(-1) at a current density of 0.5 Ag-1 in a three-electrode system. A long cycle life was also demonstrated by recording a 90.26% preservation of capacitance after 10000 cycles of charge-discharge at a current density of 4.0 Ag-1. Furthermore, a symmetrical supercapacitor is fabricated by employing the carbon nanoribbons, which shows good electrochemical performance with respect to energy, power and cycle life.
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