Electrostatic self-assembly deposition of manganese dioxide nanosheets on functionalized graphene sheets as supercapacitor electrode. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Li, Yongfeng; Jian, Jianming; Xiao, Liangjun; Liu, Fangfang; Cheng, Gao; Sun, Ming; Zhou, Junli
• Is Part Of: Ceramics international. Volume 44:Issue 2(2018)
• Page Start: 2269
• Page End: 2273
• Publication Date: 2018-02-01
• Subjects: Composites -- Transition metal oxides -- Carbon -- Electrodes; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.10.187
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Functionalized graphene was synthesized via the reduction of graphene oxide with poly(diallyldimethylammonium chloride) (PDDA). This reduced graphene oxide (RGO) changed from a negative to a positive charge. The negatively charged MnO2 nanosheets were then anchored on the positively charged surface of the PDDA- functionalized RGO (PFRGO) sheet by electrostatic self-assembly deposition. The strong interactions between the MnO2 nanosheet and the PFRGO sheet form a face-to-face assembly structure, which maximizes the exposure of MnO2 redox-active sites and accelerates charge transfer between the two components. The resulting MnO2 -PFRGO composite electrode exhibits a high specific capacitance of 175 F g −1, which was increased by 52% relative to pristine MnO2 . Moreover, the equivalent series resistance (ESR) value of the composite (0.66 Ω) is over two-times smaller than pristine MnO2 . The capacitance retention is 88.8% after 5000 charge–discharge cycles, demonstrating good cycling stability.