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Issue 17, 2018
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Rational selection of small aromatic molecules to functionalize graphene for enhancing capacitive energy storage

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Abstract

Surface functionalization of graphene sheets with redox-active small molecules can help store more charges due to the added pseudocapacitance. However, a clue on selecting appropriate molecules to enhance the energy storage of graphene-based supercapacitors is unclear. Herein, four different types of aromatic molecules containing amino or hydroxyl groups, or both, are selected to functionalize N-doped graphene (NG) films for a comparison study, aiming to explore factors that can enhance the capacitive performance, such as adsorption affinity to graphene, type of redox group, number of groups in a single molecule, electrochemical redox potential, capability of sustaining higher voltage in Li-salt electrolyte, and cycling performance. Among the selected organic compounds, 4,4′-oxydianiline molecules are found to be a good match for graphene. In a symmetric cell with Li2SO4 electrolyte, the functionalized NG film exhibits a high specific capacitance of 612 F g−1 as well as maintaining high coulombic efficiency within a voltage window of 1.6 V.

Graphical abstract: Rational selection of small aromatic molecules to functionalize graphene for enhancing capacitive energy storage

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Publication details

The article was received on 22 Jan 2018, accepted on 26 Mar 2018 and first published on 26 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00710A
Citation: J. Mater. Chem. A, 2018,6, 7566-7572
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    Rational selection of small aromatic molecules to functionalize graphene for enhancing capacitive energy storage

    Y. Zhao, J. Liu, N. Wang, Q. Li and M. Hu, J. Mater. Chem. A, 2018, 6, 7566
    DOI: 10.1039/C8TA00710A

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