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Nanoarchitecture of MOF-Derived Nanoporous Functional Composites for Hybrid Supercapacitors

Abstract

A new nanoarchitecture approach based on metal-organic frameworks (MOF) is reported that can achieve high electrochemical energy storage via utilizing both electric double-layer supercapacitive and pseudocapacitive properties within a single nanoporous composite particle. Herein, a predesigned Co2+-excess bimetallic hybrid Co/Zn zeolitic imidazole framework was used to fabricate a composite containing N-doped nanoporous carbon with a rich carbon nanotube (CNT) content on particle surfaces without H2, with the carbon coexisting with Co nanoparticles (NPs) and Co3O4, through controlled carbonization at 800 °C and subsequent oxidation at 250−300°C, respectively. The optimized nanoporous carbon composites were obtained by tracking the formation of Co3O4, and destruction of N-doped nanoporous carbon (NPC) via detailed X-ray diffraction and X-ray photoelectron spectroscopy analysis. The resulting material showed a high surface area of ~202 m2·g-1 and included coexisiting micro- and mesoporous N-doped carbon, CNTs, Co NPs, and Co3O4, (15 nm in size) after a thermal oxidation process under air at 250°C for 5 hr. Surprisingly, the as-prepared MOF-derived nanoarchitecture exhibited superior electrochemical storage performance, with capacitance of 545 F·g-1 within a wide potential window, achieving up to 320% enhanced capacitance compared to that of the pristine nanoporous carbon, which is higher than for most MOF-derived carbons reported so far. Our strategic nanoarchitecture design for the MOF offers a new opportunity for future applications in high performance energy storage systems.

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Publication details

The article was accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03356G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Nanoarchitecture of MOF-Derived Nanoporous Functional Composites for Hybrid Supercapacitors

    J. Kim, C. Young, J. Lee, Y. U. Heo, M. Park, M. S. Hossain, Y. Yamauchi and J. H. Kim, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03356G

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