Ni(OH) sub(2) nanosheets grown on a 3D graphene framework as an excellent cathode for flexible supercapacitors

• Published in: RSC advances Vol. 4; no. 88; pp. 47609 - 47614
• Main Authors: Ma, Yufang, Chen, Wanjun, Zhang, Peng, Teng, Feng, Zhou, Jinyuan, Pan, Xiaojun, Xie, Erqing
• Format: Journal Article
• Language: English
• Published: 01.09.2014
• Subjects: Capacitance; Cathodes; Chemical vapor deposition; Electrodes; Foams; Graphene; Nanostructure; Supercapacitors
• ISSN: 2046-2069
• DOI: 10.1039/c4ra08786k

Ni(OH) sub(2) nanosheet/3D graphene (3DG) framework hybrid materials have been prepared by combining chemical vapor deposition (CVD) technology and a facile hydrothermal method. The free-standing Ni(OH) sub(2) nanosheet/3DG composite was investigated as the cathode material for supercapacitors without the need for addition of either binder or metal-based current collector. Consequently, the obtained Ni(OH) sub(2) nanosheet/3DG composite electrode exhibits superior specific capacitance and rate capability to the Ni(OH) sub(2) nanosheet/Ni foam and Ni(OH) sub(2) nanosheet/carbon fiber cloth composite electrodes. This novel structure brings the composite an electrochemical capacitance as high as 2860 F g super(-1) at a current density of 2 A g super(-1), and maintains 1791 F g super(-1) at 30 A g super(-1). Moreover, the composite electrode also exhibits a high specific capacitance of 2461 F g super(-1) at a scan rate of 5 mV s super(-1).