文章基本信息

标题：Porous honeycomb structures formed from interconnected MnO₂ sheets on CNT-coated substrates for flexible all-solid-state supercapacitors
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作者：Wen-Yin Ko ; You-Feng Chen ; Ke-Ming Lu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：6
DOI：10.1038/srep18887
出版社：Springer Nature
摘要：The use of lightweight and easily-fabricated MnO₂/carbon nanotube (CNT)-based flexible networks as binder-free electrodes and a polyvinyl alcohol/H₂SO₄ electrolyte for the formation of stretchable solid-state supercapacitors was examined. The active electrodes were fabricated from 3D honeycomb porous MnO₂ assembled from cross-walled and interconnected sheet-architectural MnO₂ on CNT-based plastic substrates (denoted as honeycomb MnO₂/CNT textiles).These substrates were fabricated through a simple two-step procedure involving the coating of multi-walled carbon nanotubes (MWCNTs) onto commercial textiles by a dipping-drying process and subsequent electrodeposition of the interconnected MnO₂ sheets onto the MWCNT-coated textile. With such unique MnO₂ architectures integrated onto CNT flexible films, good performance was achieved with a specific capacitance of 324 F/g at 0.5 A/g. A maximum energy density of 7.2 Wh/kg and a power density as high as 3.3 kW/kg were exhibited by the honeycomb MnO₂/CNT network device, which is comparable to the performance of other carbon-based and metal oxide/carbon-based solid-state supercapacitor devices. Specifically, the long-term cycling stability of this material is excellent, with almost no loss of its initial capacitance and good Coulombic efficiency of 82% after 5000 cycles. These impressive results identify these materials as a promising candidate for use in environmentally friendly, low-cost, and high-performance flexible energy-storage devices.