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Merging of Kirkendall Growth and Ostwald Ripening: CuO@MnO(2) Core-shell Architectures for Asymmetric Supercapacitors

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...

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Detalles Bibliográficos
Autores principales: Huang, Ming, Zhang, Yuxin, Li, Fei, Wang, Zhongchang, Alamusi, Hu, Ning, Wen, Zhiyu, Liu, Qing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3970130/
https://www.ncbi.nlm.nih.gov/pubmed/24682149
http://dx.doi.org/10.1038/srep04518
Descripción
Sumario: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.