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A novel all solid-state asymmetric supercapacitor with superior electrochemical performance in a wide temperature range using a hydroquinone modified graphene xerogel as the cathode and N-doped Ti3C2Tx as the anode

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Abstract

To further improve the energy density of supercapacitors, novel asymmetric supercapacitors using electrode materials with a large potential window should be designed. In this report, a hydroquinone modified graphene xerogel as the cathode and N-doped Ti3C2Tx as the anode are first applied in all-solid-state asymmetric supercapacitors with a wide voltage window. The hydroquinone modified binder-free graphene xerogels are chosen as the cathode materials because of their high potential, high pseudocapacitance, and high conductivity, whereas the N-doped Ti3C2Tx are selected as the anode materials due to their low potential, high specific capacitance, and high conductivity. The as-fabricated asymmetric device shows a potential window of 1.7 V in a H2SO4 gel electrolyte, and excellent adaptability in a wide temperature range from room temperature to −20 °C. It is found that an excellent energy density of 33.9 W h kg−1 for the asymmetric supercapacitor is achieved at −20 °C. Furthermore, the operation of the asymmetric supercapacitor in a wide temperature range greatly increases the practical application potential of supercapacitors.

Graphical abstract: A novel all solid-state asymmetric supercapacitor with superior electrochemical performance in a wide temperature range using a hydroquinone modified graphene xerogel as the cathode and N-doped Ti3C2Tx as the anode

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Publication details

The article was received on 27 Aug 2019, accepted on 09 Oct 2019 and first published on 11 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09447D
J. Mater. Chem. A, 2019, Advance Article

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    A novel all solid-state asymmetric supercapacitor with superior electrochemical performance in a wide temperature range using a hydroquinone modified graphene xerogel as the cathode and N-doped Ti3C2Tx as the anode

    Q. Sun, T. He and Y. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09447D

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