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Salunkhe RR, Tang J, Kamachi Y, et al. Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework. ACS Nano. 2015;9(6):6288-96doi: 10.1021/acsnano.5b01790.
Salunkhe, R. R., Tang, J., Kamachi, Y., Nakato, T., Kim, J. H., & Yamauchi, Y. (2015). Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework. ACS nano, 9(6), 6288-96. https://doi.org/10.1021/acsnano.5b01790
Salunkhe, Rahul R, et al. "Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework." ACS nano vol. 9,6 (2015): 6288-96. doi: https://doi.org/10.1021/acsnano.5b01790
Salunkhe RR, Tang J, Kamachi Y, Nakato T, Kim JH, Yamauchi Y. Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework. ACS Nano. 2015 Jun 23;9(6):6288-96. doi: 10.1021/acsnano.5b01790. Epub 2015 May 26. PMID: 25978143.
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ACS Nano. 2015 Jun 23;9(6):6288-96. doi: 10.1021/acsnano.5b01790. Epub 2015 May 26.

Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework.

ACS nano

Rahul R Salunkhe, Jing Tang, Yuichiro Kamachi, Teruyuki Nakato, Jung Ho Kim, Yusuke Yamauchi

Affiliations

  1. †World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
  2. ‡Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
  3. §Department of Applied Chemistry, Graduate School of Engineering, Kyushu Institute of Technology, 1-1 Sensui-Cho, Tobata, Kitakyushu, Fukuoka 804-8550, Japan.
  4. ?Institute for Superconducting and Electronic Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia.

PMID: 25978143 DOI: 10.1021/acsnano.5b01790

Abstract

Nanoporous carbon and nanoporous cobalt oxide (Co3O4) materials have been selectively prepared from a single metal-organic framework (MOF) (zeolitic imidazolate framework, ZIF-67) by optimizing the annealing conditions. The resulting ZIF-derived carbon possesses highly graphitic walls and a high specific surface area of 350 m(2)·g(-1), while the resulting ZIF-derived nanoporous Co3O4 possesses a high specific surface area of 148 m(2)·g(-1) with much less carbon content (1.7 at%). When nanoporous carbon and nanoporous Co3O4 were tested as electrode materials for supercapacitor application, they showed high capacitance values (272 and 504 F·g(-1), respectively, at a scan rate of 5 mV·s(-1)). To further demonstrate the advantages of our ZIF-derived nanoporous materials, symmetric (SSCs) and asymmetric supercapacitors (ASCs) were also fabricated using nanoporous carbon and nanoporous Co3O4 electrodes. Improved capacitance performance was successfully realized for the ASC (Co3O4//carbon), better than those of the SSCs based on nanoporous carbon and nanoporous Co3O4 materials (i.e., carbon//carbon and Co3O4//Co3O4). The developed ASC with an optimal mass loading can be operated within a wide potential window of 0.0-1.6 V, which leads to a high specific energy of 36 W·h·kg(-1). More interestingly, this ASC also exhibits excellent rate capability (with the highest specific power of 8000 W·kg(-1) at a specific energy of 15 W·h·kg(-1)) combined with long-term stability up to 2000 cycles.

Keywords: carbon; cobalt oxide; coordination polymers; metal−organic frameworks; nanoporous materials; supercapacitors

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