Merging of Kirkendall Growth and Ostwald Ripening: CuO@MnO2 Core-shell Architectures for Asymmetric Supercapacitors

• Published in: Scientific reports Vol. 4; no. 1; p. 4518
• Main Authors: Huang, Ming, Zhang, Yuxin, Li, Fei, Wang, Zhongchang, Alamusi, Hu, Ning, Wen, Zhiyu, Liu, Qing
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 31.03.2014; Nature Publishing Group
• Subjects: 147/135; 147/143; 639/301/299; 639/638; Humanities and Social Sciences; multidisciplinary; Science
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep04518

Fabricating hierarchical core-shell nanostructures is currently the subject of intensive research in the electrochemical field owing to the hopes it raises for making efficient electrodes for high-performance supercapacitors. Here, we develop a simple and cost-effective approach to prepare CuO@MnO 2 core-shell nanostructures without any surfactants and report their applications as electrodes for supercapacitors. An asymmetric supercapacitor with CuO@MnO 2 core-shell nanostructure as the positive electrode and activated microwave exfoliated graphite oxide (MEGO) as the negative electrode yields an energy density of 22.1 Wh kg −1 and a maximum power density of 85.6 kW kg −1 ; the device shows a long-term cycling stability which retains 101.5% of its initial capacitance even after 10000 cycles. Such a facile strategy to fabricate the hierarchical CuO@MnO 2 core-shell nanostructure with significantly improved functionalities opens up a novel avenue to design electrode materials on demand for high-performance supercapacitor applications.