Fast Ionic Diffusion-Enabled Nanoflake Electrode by Spontaneous Electrochemical Pre-Intercalation for High-Performance Supercapacitor
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Mai, Liqiang
Li, Han
Zhao, Yunlong
Xu, Xu
Luo, Yanzhu
Zhang, Zhengfei
Ke, Wang
Niu, Chaojiang
Zhang, Qingjie
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https://doi.org/10.1038/srep01718Metadata
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Mai, Liqiang, Han Li, Yunlong Zhao, Lin Xu, Xu Xu, Yanzhu Luo, Zhengfei Zhang, Wang Ke, Chaojiang Niu, and Qingjie Zhang. 2013. Fast ionic diffusion-enabled nanoflake electrode by spontaneous electrochemical pre-intercalation for high-performance supercapacitor. Scientific Reports 3:1718.Abstract
Layered intercalation compounds Na\(_{x}\)MnO\(_{2}\) (x = 0.7 and 0.91) nanoflakes have been prepared directly through wet electrochemical process with Na\(^{+}\) ions intercalated into MnO\(_{2}\) interlayers spontaneously. The as-prepared Na\(_{x}\)MnO\(_{2}\) nanoflake based supercapacitors exhibit faster ionic diffusion with enhanced redox peaks, tenfold-higher energy densities up to 110 Wh·kg\(^{-1}\) and higher capacitances over 1000 F·g\(^{-1}\) in aqueous sodium system compared with traditional MnO\(_{2}\) supercapacitors. Due to the free-standing electrode structure and suitable crystal structure, Na\(_{x}\)MnO\(_{2}\) nanoflake electrodes also maintain outstanding electrochemical stability with capacitance retention up to 99.9% after 1000 cycles. Besides, pre-intercalation effect is further studied to explain this enhanced electrochemical performance. This study indicates that the suitable pre-intercalation is effective to improve the diffusion of electrolyte cations and other electrochemical performance for layered oxides, and suggests that the as-obtained nanoflakes are promising materials to achieve the hybridization of both high energy and power density for advanced supercapacitors.Other Sources
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3634106/pdf/Terms of Use
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