The simple preparation of birnessite-type manganese oxide with flower-like microsphere morphology and its remarkable capacity retention
The simple preparation of birnessite-type manganese oxide with flower-like microsphere morphology and its remarkable capacity retention
复制标题
DOI：
10.1016/j.materresbull.2012.06.065
复制
发表时间：
2012-11
影响因子：
5.4
通讯作者：
G. Zhu;Lingjuan Deng;Jianfang Wang;Liping Kang;Zonghuai Liu
中科院分区：
文献类型：
--
作者：
G. Zhu;Lingjuan Deng;Jianfang Wang;Liping Kang;Zonghuai Liu
以KMnO 4和（NH 4）2SO 4的混合溶液为原料，在90°C下水热处理24 h，制备了具有花状微球形貌和大比表面积的水锰矿。采用X射线衍射、扫描电镜、透射电镜和N2吸附-脱附等手段对材料进行了表征。结果表明，水钠锰矿型氧化锰具有新颖的花状微球形貌，比表面积为280 m2 g −1，花状微球由薄的纳米片晶组成。电化学表征表明，所制备的材料表现出理想的电容行为，在5 mVs-1的扫描速率下，在1 molL-1 Na 2SO 4水溶液中的电容值为278 Fg-1。此外，所制备的锰氧化物电极显示出优异的循环稳定性，在5000次循环后，比电容可以保持初始的98.6%。
Birnessite-type manganese oxide with flower-like microsphere morphology and large specific surface area has been prepared by hydrothermal treating a mixture solution of KMnO4and (NH4)2SO4at 90°C for 24h. The obtained material is characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N2adsorption–desorption. Results indicate that the birnessite-type manganese oxide shows novel flower-like microsphere morphology and a specific surface area of 280m2g−1, and the flower-like microsphere consists of the thin nano-platelets. Electrochemical characterization indicates that the prepared material exhibits an ideal capacitive behavior with a capacitance value of 278Fg−1in 1molL−1Na2SO4aqueous solution at a scan rate of 5mVs−1. Moreover, the prepared manganese oxide electrode shows excellent cycle stability, and the specific capacitance can maintain 98.6% of the initial one after 5000 cycles.