Nanoarchitecture of MOF-derived nanoporous functional composites for hybrid supercapacitors



Publication Details

Kim, J., Young, C., Lee, J., Heo, Y., Park, M., Hossain, M. A., Yamauchi, Y. & Kim, J. (2017). Nanoarchitecture of MOF-derived nanoporous functional composites for hybrid supercapacitors. Journal of Materials Chemistry A, 5 (29), 15065-15072.


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 Co 2+ -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 H 2 , with the carbon coexisting with Co nanoparticles (NPs) and Co 3 O 4 , through controlled carbonization at 800 °C and subsequent oxidation at 250-300 °C. Optimized nanoporous carbon composites were obtained by tracking the formation of Co 3 O 4 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 m 2 g -1 and included coexisting micro- and mesoporous N-doped carbon, CNTs, Co NPs, and Co 3 O 4 (15 nm in size) after a thermal oxidation process in air at 250 °C for 5 h. Surprisingly, the as-prepared MOF-derived nanoarchitecture exhibited superior electrochemical storage performance, with a capacitance of 545 F g -1 within a wide potential window, achieving up to 320% enhanced capacitance compared to that of pristine nanoporous carbon, which is higher than those of most MOF-derived carbons reported so far. Our strategic nanoarchitecture design for MOFs offers a new opportunity for future applications in high performance energy storage systems.

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