4.7 Article

High-energy-density flexible graphene-based supercapacitors enabled by atypical hydroquinone dimethyl ether

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 648, Issue -, Pages 231-241

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.05.194

Keywords

Aromatic ethers; Supercapacitor; Flexible and wearable electronics; Graphene functionalization

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Supercapacitor is an electrochemical energy storage technology that can meet future green and sustainable energy needs. A heterojunction system composed of 2D graphene and hydroquinone dimethyl ether was developed to overcome the low energy density limitation. The heterojunction displayed a large specific capacitance, good rate capability, and cycling stability. Supercapacitors assembled with this system showed attractive capacitive characteristics and could deliver high energy and power densities with minimal degradation.
Supercapacitor is an electrochemical energy-storage technology that can meet the green and sustainable energy needs of the future. However, a low energy density was a bottleneck that limited its practical application. To overcome this, we developed a heterojunction system composed of two-dimensional (2D) graphene and hy-droquinone dimethyl ether-an atypical redox-active aromatic ether. This heterojunction displayed a large spe-cific capacitance (Cs) of 523 F g-1 at 1.0 A g-1, as well as good rate capability and cycling stability. When assembled in symmetric and asymmetric two-electrode configuration, respectively, supercapacitors can work in voltage windows of 0 -1.0 V and 0 -1.6 V, accordingly, and exhibited attractive capacitive characteristics. The best device can deliver an energy density of 32.4 Wh Kg-1 and a power density of 8000 W Kg-1, and suffered a small capacitance degradation. Additionally, the device showed low self-discharge and leakage current behaviors during long time. This strategy may inspire exploration of aromatic ether electrochemistry and pave a way to develop electrical double-layer capacitance (EDLC)/pseudocapacitance heterojunctions to boost the critical en-ergy density.

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