文章基本信息

标题：Fast Ionic Diffusion-Enabled Nanoflake Electrode by Spontaneous Electrochemical Pre-Intercalation for High-Performance Supercapacitor
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作者：Liqiang Mai ; Han Li ; Yunlong Zhao 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
期号：1
DOI：10.1038/srep01718
语种：English
出版社：Springer Nature
摘要：Layered intercalation compounds Na _x MnO₂ (x = 0.7 and 0.91) nanoflakes have been prepared directly through wet electrochemical process with Na⁺ ions intercalated into MnO₂ interlayers spontaneously. The as-prepared Na _x MnO₂ 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 MnO₂ supercapacitors. Due to the free-standing electrode structure and suitable crystal structure, Na _x MnO₂nanoflake 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.