Synthesis and capacitive property of hierarchical hollow manganese oxide nanospheres with large specific surface area
Synthesis and capacitive property of hierarchical hollow manganese oxide nanospheres with large specific surface area
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DOI：
10.1016/j.jpowsour.2009.04.037
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发表时间：
2009-09
影响因子：
9.2
通讯作者：
Xiuhua Tang;Zonghuai Liu;Chengxiao Zhang;Zupei Yang;Zengling Wang
中科院分区：
文献类型：
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作者：
Xiuhua Tang;Zonghuai Liu;Chengxiao Zhang;Zupei Yang;Zengling Wang
通过模板辅助水热法在150℃下48h成功制备出具有大表面积和层状结构的多级中空氧化锰纳米球。将SiO2模板球分散在KMnO4溶液中，然后通过水热处理形成具有核壳结构的二氧化硅/氧化锰纳米球。将核壳纳米球在NaOH溶液(20wt.%)中蚀刻，去除SiO2核，得到分级空心氧化锰纳米球。合成的分级空心氧化锰纳米球呈现水钠锰矿型氧化锰相，化学组成为Na0.38MnO2.14·13H2O，比表面积为253m2g−1。所制备的材料在中性电解质体系中表现出理想的电容行为和良好的循环稳定性，初始电容值为299Fg−1。还研究了一些制备条件，包括水热温度、停留时间和模板浓度。
The hierarchical hollow manganese oxide nanospheres with both a large surface area and a layered structure have been successfully prepared by a templating-assisted hydrothermal process at 150°C for 48h. SiO2template spheres are dispersed in KMnO4solution, and then followed by hydrothermal treatment to forming silica/manganese oxide nanospheres with a core-shell structure. The core-shell nanospheres are etched in a NaOH solution (20wt.%), so that the SiO2core is removed, and the hierarchical hollow manganese oxide nanospheres are obtained. The as-synthesized hierarchical hollow manganese oxide nanospheres present a birnessite-type manganese oxide phase with a chemical composition of Na0.38MnO2.14·13H2O, and a specific surface area of 253m2g−1. The prepared materials exhibit an ideal capacitive behavior and good cycling stability in a neutral electrolyte system and the initial capacitance value is 299Fg−1. Some preparation conditions including the hydrothermal temperature, dwell time and concentration of template have been also investigated.