N-doped porous carbons derived from Zn-porphyrin-MOF

Hyun-Chul Kim; Jongho Yoon; Sukbin Yoon; Youngmee Kim; Suk Joong Lee; Seong Huh

doi:10.1039/d2ra00327a

N-doped porous carbons derived from Zn-porphyrin-MOF

RSC Adv. 2022 Feb 18;12(10):5979-5989. doi: 10.1039/d2ra00327a. eCollection 2022 Feb 16.

Authors

Hyun-Chul Kim¹, Jongho Yoon², Sukbin Yoon¹, Youngmee Kim³, Suk Joong Lee², Seong Huh¹

Affiliations

¹ Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies Yongin 17035 Republic of Korea shuh@hufs.ac.kr +82 31 330 4566 +82 31 330 4522.
² Department of Chemistry, Research Institute for Natural Science, Korea University Seoul 136-701 Republic of Korea slee1@korea.ac.kr.
³ Department of Chemistry and Nano Science, Ewha Womans University Seoul 120-750 Republic of Korea ymeekim@ewha.ac.kr.

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.