Freestanding RGO—Co3O4—PPy Composite Films as Electrodes for Supercapacitors. Issue 3 (12th March 2019)

• Record Type: Journal Article
• Authors: Jiang, Lili; Li, Youjian; Luo, Dan; Zhang, Qinyong; Cai, Fanggong; Wan, Guojiang; Xiong, Lu; Ren, Zhifeng
• Is Part Of: Energy technology. Volume 7:Issue 3(2019:Mar.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-12
• Subjects: cobalt oxide -- freestanding electrodes -- grapheme -- polypyrrole -- supercapacitors; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201800606
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : Supercapacitors are of great importance for energy storage and have been the subject of intensive research in recent years, in which conductive polymers are used to make flexible and freestanding electrodes. However, their insufficient access to the electrolytes and the low chemical stability of these conductive polymers lead to their poor performance. To solve these issues, a facile method that can be used to synthesize freestanding composite film electrodes of reduced graphene oxide–cobalt oxide–polypyrrole (RGO—Co3 O4 —PPy) as supercapacitors is demonstrated. They exhibit a high specific capacitance of 532.8 F g −1 and nearly no degradation after 700 cycles of charging and discharging. The synergistic effect of Co3 O4, RGO, and PPy is responsible for the superior property. The three‐phase composite electrode utilizes the RGO nanosheet as a substrate to provide a large surface area for loading Co3 O4 nanoparticles and also to enhance the electron transfer. Furthermore, the deposition of PPy largely reduces the resistivity of RGO—Co3 O4 —PPy, and the introduction of Co3 O4 nanoparticles significantly improves cycle stability. Abstract : New composite electrode materials are synthesized and studied for use as supercapacitors in energy storage applications.