Robust and conductive two-dimensional metal−organic frameworks with exceptionally high volumetric and areal capacitance

Dawei Feng, Ting Lei, Maria R. Lukatskaya, Jihye Park, Zhehao Huang, Minah Lee, Leo Shaw, Shucheng Chen, Andrey A. Yakovenko, Ambarish Kulkarni, Jianping Xiao, Kurt Fredrickson, Jeffrey B. Tok, Xiaodong Zou, Yi Cui and Zhenan Bao ()
Additional contact information
Dawei Feng: Department of Chemical Engineering, Stanford University
Ting Lei: Department of Chemical Engineering, Stanford University
Maria R. Lukatskaya: Department of Chemical Engineering, Stanford University
Jihye Park: Department of Chemical Engineering, Stanford University
Zhehao Huang: Stockholm University
Minah Lee: Department of Chemical Engineering, Stanford University
Leo Shaw: Department of Chemical Engineering, Stanford University
Shucheng Chen: Department of Chemical Engineering, Stanford University
Andrey A. Yakovenko: Argonne National Laboratory
Ambarish Kulkarni: Stanford University
Jianping Xiao: Stanford University
Kurt Fredrickson: Stanford University
Jeffrey B. Tok: Department of Chemical Engineering, Stanford University
Xiaodong Zou: Stockholm University
Yi Cui: Stanford University
Zhenan Bao: Department of Chemical Engineering, Stanford University

Nature Energy, 2018, vol. 3, issue 1, 30-36

Abstract: Abstract For miniaturized capacitive energy storage, volumetric and areal capacitances are more important metrics than gravimetric ones because of the constraints imposed by device volume and chip area. Typically used in commercial supercapacitors, porous carbons, although they provide a stable and reliable performance, lack volumetric performance because of their inherently low density and moderate capacitances. Here we report a high-performing electrode based on conductive hexaaminobenzene (HAB)-derived two-dimensional metal−organic frameworks (MOFs). In addition to possessing a high packing density and hierarchical porous structure, these MOFs also exhibit excellent chemical stability in both acidic and basic aqueous solutions, which is in sharp contrast to conventional MOFs. Submillimetre-thick pellets of HAB MOFs showed high volumetric capacitances up to 760 F cm−3 and high areal capacitances over 20 F cm−2. Furthermore, the HAB MOF electrodes exhibited highly reversible redox behaviours and good cycling stability with a capacitance retention of 90% after 12,000 cycles. These promising results demonstrate the potential of using redox-active conductive MOFs in energy-storage applications.

Date: 2018
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DOI: 10.1038/s41560-017-0044-5

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