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Redox-active phthalocyanine-decorated graphene aerogels for high-performance supercapacitors based on ionic liquid electrolyte

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Abstract

Ionic liquids (ILs) with a wide potential window have shown great potential in the fabrication of high-energy supercapacitors (SCs). However, developing pseudocapacitive material-matching IL electrolytes for further incorporating their energy-storing advantages is still a great challenge. Herein, we demonstrated the one-step hydrothermal synthesis of phthalocyanine (PC) and copper(II) phthalocyanine (CuPC)-functionalized reduced graphene oxide aerogels (PC-rGA and CuPC-rGA, respectively). PC and CuPC with a nitrogen-containing π-conjugated macrocyclic structure and redox activity were anchored on the surface of graphene sheets via π–π interactions, and thus PC-rGA and CuPC-rGA could match imidazolium IL electrolytes and provide pseudocapacitance, exhibiting an enhanced specific capacitance of 192 F g−1 and 201 F g−1 at 1 A g−1, respectively. Moreover, the symmetric SCs assembled using the aerogels delivered a high energy density of 111 W h kg−1 at a power density of 1009 W kg−1 for CuPC-rGA, and 107 W h kg−1 at 1000 W kg−1 for PC-rGA.

Graphical abstract: Redox-active phthalocyanine-decorated graphene aerogels for high-performance supercapacitors based on ionic liquid electrolyte

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Supplementary files

Article information


Submitted
17 Aug 2020
Accepted
05 Oct 2020
First published
05 Oct 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Redox-active phthalocyanine-decorated graphene aerogels for high-performance supercapacitors based on ionic liquid electrolyte

L. Yang, K. Zhuo, X. Xu, Z. Zhang, Q. Du, Y. Chen, D. Sun and J. Wang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA08054C

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