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Boosting PEDOT energy storage with redox anthraquinone dopant for flexible hydrogel supercapacitor under sub-zero temperatures
Journal article   Peer reviewed

Boosting PEDOT energy storage with redox anthraquinone dopant for flexible hydrogel supercapacitor under sub-zero temperatures

Chen Chen, Yueqin Li, Changhao Qian, Lin Han, Zichun Lu and Linke Liu
Journal of materials chemistry. C, Materials for optical and electronic devices
2023
DOI: https://doi.org/10.1039/D3TC00635B

Abstract

Although electrically conductive hydrogels based on conductive polymers hold promise for flexible and high-performance supercapacitors, it is still a challenge for such devices to maintain high capacitance with temperature change, especially under subzero conditions. Herein, conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) decorated with redox-active anthraquinone-2-sulfonic acid sodium (AQS) on the surface is homogeneously dispersed in poly(acrylic acid) (PAA) hydrogel, which reinforce the conductivity and the stretchability of the obtained AQS-PEDOT/PAA hydrogel electrode. Particularly, with the containing of H2SO4+KCl electrolyte, the hydrogel is temperature tolerant to endow the assembled supercapacitor with wide working temperature of -30~90 °C. Due to the extra energy storage contribution of AQS, the device exhibits a high capacitance of 466.5 mF/cm2, a maximum energy density of 41.47 μWh/cm2 and exceptional cyclic stability of 90% retention after 5000 cycles. Very interestingly, the AQS-PEDOT/PAA electrode shows a remarkable solar-thermal conversion, which significantly boost the electrochemical performance of the device at subzero conditions. Under solar illumination, the device shows a capacitance enhancement of 39.6% at -30 °C as compared with the device in the dark. This work provides an innovative strategy to spur sluggish performance of conductive polymer-based hydrogel supercapacitors for practical applications.

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