文献类型：期刊文献

英文题名：Hierarchical porous nanostructures assembled from ultrathin MnO₂ nanoflakes with enhanced supercapacitive performances

作者：Jiang, Hao[1];Sun, Ting[2];Li, Chunzhong[1];Ma, Jan[2]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

年份：2012

卷号：22

期号：6

起止页码：2751

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000299178500056)】；

基金：This work was supported by the National Natural Science Foundation of China (20925621, 20906027), the Special Projects for Key Laboratories in Shanghai (10DZ2211100), the Shanghai Shuguang Scholars Tracking Program (10SG31), the Basic Research Program of Shanghai (10JC1403300, 10JC1403600), the Shanghai Pujiang Program (09PJ1403200) and the Special Projects for Nanotechnology of Shanghai (1052nm02300).

语种：英文

摘要：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.