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Size and Crystallinity-Control of Two-dimensional Porous Cobalt Oxalate Thin Sheets: Tuning Surface Structure with Enhanced Performance for Aqueous Asymmetric Supercapacitor

Abstract

With excellent layered structure, abundant pores and high specific surface area, two-dimensional (2D) porous nanostructured materials have been demonstrated to show great potential in supercapacitors. At present, it is highly desirable but remains challenging to prepare different size and crystallinity of 2D porous thin sheets so as to further improving the performance of supercapacitors. Herein, 2D porous cobalt-oxalate (Co-OA) thin sheets with different size and crystallinity assembled by interconnected nanosheet array frameworks have been successfully synthesized, using cobalt nitrate hexahydrate as a cobalt source and oxalic acid dihydrate as a ligand, through a simple hydrothermal strategy at 220 °C for different reaction time. The as-prepared sample at 220 °C for 20 h has a high area specific capacitance (1.631 F•cm-2 at the current density of 1.2 mA•cm-2), good rate capability (80.6% retention upon increasing the current density from 1.2 to 12 mA•cm-2) and excellent cycling performance (1.5 % attenuation at 6.0 mA•cm-2 for 2000 cycles). In addition, one aqueous asymmetric supercapacitor (ASC) is constructed based on the sample synthesised at 220 °C for 20 h as positive electrodes and activated carbon (AC) as negative electrodes. This ASC effectively provides a maximum energy density of 17.675 Wh•kg-1 at 900 W•kg-1, still maintaining 8.25 Wh•kg-1 at 9000 W•kg-1, which demonstrate its may be an promising candidate in energy storage for supercapacitors. It is worth emphasizing that this strategy could be extended to fabricate other materials with different size and crystallinity.

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Supplementary files

Publication details

The article was received on 12 May 2018, accepted on 14 Jun 2018 and first published on 14 Jun 2018


Article type: Communication
DOI: 10.1039/C8DT01920G
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Size and Crystallinity-Control of Two-dimensional Porous Cobalt Oxalate Thin Sheets: Tuning Surface Structure with Enhanced Performance for Aqueous Asymmetric Supercapacitor

    T. Pu, J. Li, Y. Jiang, B. Huang, W. Wang, C. Zhao, L. Xie and L. Chen, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01920G

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