title: Merging of Kirkendall growth and Ostwald ripening: CuO@MnO2 core-shell architectures for asymmetric supercapacitors.
abstract: 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@MnO2 core-shell nanostructures without any surfactants and report their applications as electrodes for supercapacitors. An asymmetric supercapacitor with CuO@MnO2 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@MnO2 core-shell nanostructure with significantly improved functionalities opens up a novel avenue to design electrode materials on demand for high-performance supercapacitor applications.
authors.affiliation: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Huang
authors.affiliation: 1] College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China [2] National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, China.
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Li
authors.affiliation: 1] WPI, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan [2] Department of Engineering Mechanics, College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Zhongchang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Engineering Mechanics, College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
authors.lastname: Alamusi
authors.affiliation: Department of Engineering Mechanics, College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Hu
authors.affiliation: National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, China.
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Wen
authors.affiliation: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu