期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 6, 页码 2751-2756出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm14732c
关键词
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资金
- National Natural Science Foundation of China [20925621, 20906027]
- Special Projects for Key Laboratories in Shanghai [10DZ2211100]
- Shanghai Shuguang Scholars Tracking Program [10SG31]
- Basic Research Program of Shanghai [10JC1403300, 10JC1403600]
- Shanghai Pujiang Program [09PJ1403200]
- Special Projects for Nanotechnology of Shanghai [1052nm02300]
Three kinds of hierarchical porous nanostructures assembled from ultrathin MnO2 nanoflakes with different sizes and crystallinities, have been synthesized by a very simple and scalable strategy. When applied as electrode materials for supercapacitors, all of them exhibited enhanced electrochemical performances due to the high utilization of active materials. More significantly, based on these ultrathin nanostructures, we have discussed the relationships between their specific areas, pore sizes and crystallinities and their electrochemical performances. Among them, the product synthesized in an ice bath with an especially high specific area (269 m(2) g(-1)), uniform pore size distribution (similar to 5.1 nm) and poor crystallinity, exhibited the highest specific capacitance (328 F g(-1)) with a high rate and cycling stability. It is thought that the hierarchical ultrathin porous nanostructures can serve as promising electrode materials for supercapacitors.
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