Three-dimensional porous reduced graphene oxide/PEDOT:PSS aerogel: Facile preparation and high performance for supercapacitor electrodes

• Published in: Electrochimica acta 2020-12, Vol.364, p.137297, Article 137297
• Main Authors: Huang, Hui, Xia, Lichen, Zhao, Yongpeng, Zhang, Hao, Cong, Tianze, Wang, Jianzhen, Wen, Ningxuan, Yang, Shuaitao, Fan, Zeng, Pan, Lujun
• Format: Article
• Language: English
• Subjects: Aerogel; Aerogels; Capacitance; Conducting polymers; Dimensional stability; Electrical resistivity; Electrochemical analysis; Electrode materials; Electrodes; Energy storage; Flux density; Graphene; Gravimetry; Hydrothermal treatment; Interlayers; PEDOT:PSS; Reduced graphene oxide; Sheets; Stacking; Supercapacitors; Synergistic effect
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2020.137297

•We synthesized a lightweight, freestanding and 3D porous rGO/ PEDOT:PSS composite aerogel for the supercapacitor application.•A facile, low-cost and all-water-processable two-step synthesis route was adopted to prepare the electrodes.•The positive effect of hydrothermal treatment on PEDOT:PSS was qualitatively investigated for the first time.•The capacitance retention (98.71% over 20,000 cycles at 20 A g−1) of the aerogel electrode is remarkable.•Wide potential window (1.4 V) and high energy density (48.18 Wh kg−1) of our device are competitive. Graphene derivatives have great potential in the field of energy storage, because of their high specific surface area, great electrical conductivity, and stable electrochemical properties. For the graphene-based electrodes with a three-dimensional (3D) porous structure, the interlayer stacking of the graphene sheets largely limits their capacitive performance, and thus hinders their wide applications. In this work, we successfully developed a lightweight, freestanding and 3D porous reduced graphene oxide (rGO)/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) composite aerogel by incorporating the conducting polymer PEDOT:PSS into interconnected rGO networks through a facile, low-cost and all-water-processable two-step synthesis route. PEDOT:PSS covering on the rGO sheets was found to not only prevent the stacking of rGO sheets, but also greatly improve the ion accessibility and mechanical stability of this highly porous spongy meshwork. Due to the synergistic effect of rGO and PEDOT:PSS, the aerogel electrodes delivered a high gravimetric specific capacitance (471 F g−1 at 0.2 A g−1), an excellent rate capability, and a remarkable capacitance retention (98.71% over 20,000 cycles at 20 A g−1). Furthermore, the aerogel-based symmetric supercapacitor exhibited a wide potential window (0–1.4 V) and an excellent energy storage performance. A high energy density of 48.18 Wh kg−1 with the power density of 1.4 kW kg−1 at 0.5 A g−1, or an energy density of 32.67 Wh kg−1 corresponding to the great power density of 14,000 W kg−1 at 5 A g−1 was achieved. These results demonstrate the great potential of the rGO/PEDOT:PSS aerogel as an excellent electrode material for energy storage applications. [Display omitted]