Co3O4/RGO/Co3O4 pseudocomposite grown in situ on a Co foil for high-performance supercapacitors. Issue 102 (19th October 2016)

• Record Type: Journal Article
• Authors: Wang, Shengqi; Ju, Peiwen; Zhu, Zhaoqiang; Zhao, Chongjun
• Is Part Of: RSC advances. Volume 6:Issue 102(2016)
• Page Start: 99640
• Page End: 99647
• Publication Date: 2016-10-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra17543k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A Co3 O4 /RGO/Co3 O4 pseudocomposite was grown in situ on a Co substrate using a one-step hydrothermal process and exhibited excellent electrochemical performances. Abstract : A Co3 O4 /RGO/Co3 O4 (CRC) pseudocomposite on a cobalt foil was prepared using a one-pot in situ hydrothermal method. Carrying out a chemical redox reaction between the Co foil and graphene oxide (GO), which involved an electrostatic attraction between GO (negative charge) and Co 2+ (positive charge), allowed for the design and construction of a novel sandwich structure including Co3 O4 (from Co 2+ ions), RGO, and Co3 O4 (from the Co foil). The CRC@Co nanocomposite was directly utilized as a binder-free supercapacitor electrode. When this composite was prepared at 200 °C for 24 h, it exhibited superior electrochemical performances: a specific capacitance of 2272.7 mF cm −2 at 5 mA cm −2, and a capacity retention of 81.6% after 2000 charge–discharge cycles.