High-performance hybrid capacitor based on a porous polypyrrole/reduced graphene oxide composite and a redox-active electrolyte. (10th September 2020)

• Record Type: Journal Article
• Authors: Moyseowicz, Adam; Gryglewicz, Grażyna
• Is Part Of: Electrochimica acta. Volume 354(2020)
• Publication Date: 2020-09-10
• Subjects: Hybrid capacitor -- Hydroquinone -- Energy storage -- Hydrothermal treatment -- Polymer-graphene composite; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136661
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Aqueous redox-active electrolytes can provide a significant improvement in electric energy storage for electrochemical capacitors. Herein, we report a novel hybrid capacitor consisting of porous polypyrrole/reduced graphene oxide (PPy/rGO-HT) composite electrodes and an aqueous electrolyte with hydroquinone redox-active species. A hydrothermal-assisted synthesis of the PPy/rGO-HT composite allowed to obtain a porous polymer-graphene composite with a high specific surface area of 597 m 2 g −1 . In a three-electrode configuration with the redox-active electrolyte, PPy/rGO-HT exhibits better electrochemical performance in terms of specific capacity and cycling stability compared with that of pristine rGO. An assembled symmetric device achieves excellent long-term stability and a specific energy of 6.5 Wh kg −1, indicating the potential of hybrid systems for energy storage applications. Graphical abstract: Image 1 Highlights: PPy combined with GO under hydrothermal conditions yielded a porous composite. The binary material achieved a high specific surface area of 597 m 2 g −1 . The redox-active electrolyte greatly contributed to the total capacity of the system. Symmetric hybrid device exhibited excellent long-life performance over 12 000 cycles.