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A Nickel Coordination Supramolecular Network Synergized with Nitrogen-doped Graphene as Advanced Cathode to Significantly Boost the Rate Capability and Durability of Supercapacitors

Abstract

The strategy of developing new materials for electrode, which integrat well with carbon materials or conducting polymers to form a robust synergistic composite, can distinctly boost the electrochemical performance of supercapacitors (SCs). In this study, a novel Ni coordination supramolecular network (CSN) of [Ni2(3,5-PDC)2•(H2O)8•(H2O)2]n (denoted as Ni-PDC, 3,5-PDC = 3,5-pyridinedicarboxylic acid) was successfully integrated with the nitrogen-doped graphene (NG) via a one-step hydrothermal method, forming a superior composite electrode material of Ni-PDC@NG. The Ni-PDC@NG electrode showed high specific capacitances of 735 F g-1 at a current density of 1 A g-1 and an outstanding cycling stability (85.3% of capacitance retention after 14 000 cycles); furthermore, it also kept a good rate capability by exhibiting a capacitance retention of 53% even at a high current density of 40 A g-1. Significantly, the SC device was assembled with Ni-PDC @NG electrode as cathode and activated carbon electrode as anode, which not only exhibited a high energy density of 21.7 Wh kg-1 at the power density of 801 W kg-1, but also kept 45.2% of its initial energy density even at the high power density of 16036 W kg-1. Besides, this as-fabricated device exhibited excellent long-term durability with 97.9% of capacitance retention after 6000 cycles.

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Publication details

The article was received on 29 Jun 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA05667B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A Nickel Coordination Supramolecular Network Synergized with Nitrogen-doped Graphene as Advanced Cathode to Significantly Boost the Rate Capability and Durability of Supercapacitors

    G. Zhang, F. Zhang, H. Yao, Z. Liu and Y. Yang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05667B

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