N-doped porous carbons derived from Zn-porphyrin-MOF |
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| Authors: | Hyun-Chul Kim Jongho Yoon Sukbin Yoon Youngmee Kim Suk Joong Lee Seong Huh |
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| Institution: | Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin 17035 Republic of Korea, Fax: +82 31 330 4566, +82 31 330 4522 ; Department of Chemistry, Research Institute for Natural Science, Korea University, Seoul 136-701 Republic of Korea.; Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750 Republic of Korea, |
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| Abstract: | N-doped porous metal–organic framework (MOF)-derived carbons (MDCs) were directly synthesized from a new Zn-DpyDtolP-MOF (ZnDpyDtolP·1/2DMF, H2DpyDtolP = 5,15-di(4-pyridyl)-10,20-di(4-methylphenyl)porphyrin) containing a 3D hexagonal network through a self-templated carbonization method. KOH-activated MDC derivatives denoted as MDC-700-nKOH were also prepared with different weight ratios of KOH activator to MDC (MDC : KOH = 1 : n, where n = 1, 2). Compared to bare MDC, MDC-700-nKOH showed effective improvements of both gas sorption and electrochemical capacitive properties. More developed microporosity by KOH activation might induce great enhancement of high operating capacitive performances. The N-doped MDC-700-2KOH had high maximum gravimetric specific capacitance (555.6 F g−1) and specific energy (40.4 W h kg−1) at 0.1 A g−1 in 1 M H2SO4. Even at a high current density of 190 A g−1 in 6 M KOH, it exhibited high capacitive performance with a large specific power of 80 423 W kg−1. MDC-700-nKOH electrodes also showed good recycling properties of electrochemical capacitance up to 30 000 cycles.The porphyrin-based Zn-MOF is directly carbonized and activated by KOH for the generation of N-doped porous carbons acting as high performance supercapacitor electrode materials. |
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