Novel Ultrathin Nanoflake Assembled Porous MnO2/Carbon Strip Microspheres for Superior Pseudocapacitors
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- 作者：Guiling Wang ; Yuwen Liu ; Guangjie Shao ; Lingxue Kong ; Weimin Gao
- 刊名：ACS Sustainable Chemistry & Engineering
- 出版年：2014
- 出版时间：September 2, 2014
- 年：2014
- 卷：2
- 期：9
- 页码：2191-2197
- 全文大小：513K
- ISSN：2168-0485
文摘
A novel hierarchical MnO2/carbon strip (MnO2/C) microsphere is synthesized via galvanostatic charge鈥揹ischarge of a MnO@C matrix precursor where the carbon is from a low-cost citric acid. This hierarchical structure is composed of manganese oxides nanoflakes and inlaid carbon strips. The ultrathin nanoflakes assemble to form porous microspheres with a rippled surface superstructure. Due to its improved conductivity and remarkable increased phase contact area, this novel structure exhibits an excellent electrochemical performance with a specific capacitance of 485.6 F g鈥? at a current density of 0.5 A g鈥? and an area capacitance as high as 4.23 F cm鈥? at a mass loading of 8.7 mg cm鈥?. It also shows an excellent cycling stability with 88.9% capacity retention after 1000 cycles. It is speculated that the present low-cost novel hierarchical porous microspheres can serve as a promising electrode material for pseudocapacitors.