Three-Dimensional Pompon-like MnO2/Graphene Hydrogel Composite for Supercapacitor. (20th August 2016)

• Record Type: Journal Article
• Authors: Zhang, Ningshuang; Fu, Chaopeng; Liu, Dan; Li, Yanling; Zhou, Haihui; Kuang, Yafei
• Is Part Of: Electrochimica acta. Volume 210(2016)
• Page Start: 804
• Page End: 811
• Publication Date: 2016-08-20
• Subjects: Supercapacitor -- Graphene Hydrogel -- pompon-like MnO2 -- Electrochemistry; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.06.004
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: A three-dimensional nanocomposite of pompon-like MnO2 /graphene hydrogel was prepared. The 3D graphene hydrogel not only provides a good support to stabilize MnO2 but also facilitate the fast ion mobility and electron transfer. The composite exhibited a good capacitive performance (445.7 F g −1 at 0.5 A g −1 ) and stability (82.4% retention after 5000 cycles). Highlights: A three-dimensional nanocomposite of pompon-like MnO2 /graphene hydrogel was prepared. GH provides a good support to stabilize MnO2 and facilitate the electron transfer. The composite exhibited a good capacitive performance (445.7 F g −1 at 0.5 A g −1 ). The composite showed excellent stability (82.4% retention after 5000 cycles). Abstract: Micro-nanostructured pompon-like MnO2 /graphene hydrogel (GH) composites with different mass ratios are prepared for supercapacitor electrodes. The morphology and structure are characterized by a range of electron microscopy and other techniques. The electrochemical performance of the prepared electrodes is investigated, and the MnO2 /graphene hydrogel composite electrode with a MnO2 content of 50% delivers a specific capacitance of 445.7 F g −1 at a current density of 0.5 A g −1, and the specific capacitance remained 82.4% of the initial value after 5000 cycles. The high performance is ascribed to the 3D pompon-like micro-nanostructure of MnO2 /graphene hydrogel that not only provides a good support to stabilize MnO2 but also facilitate the fast ion mobility and electron transfer.