Rapid synthesis of hollow structured MnO2 microspheres and their capacitance
Rapid synthesis of hollow structured MnO2 microspheres and their capacitance
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空心结构MnO2微球的快速合成及其电容
DOI：
10.1016/j.colsurfa.2010.04.014
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发表时间：
2010-06-20
影响因子：
5.2
通讯作者：
Liu, Zong-Huai
中科院分区：
文献类型：
--
作者：
He, Xuexia;Yang, Mingyang;Liu, Zong-Huai
在KMnO 4和MnSO 4混合体系中添加Fe 3+离子，在150 ℃、20 min内通过简单的水热法成功制备了空心MnO 2球，无需任何模板或表面活性剂的辅助。采用XRD、SEM、TEM等手段对样品进行了系统表征。氮吸附-脱附及元素分析。结果表明，所制备的MnO 2具有多级空心球形貌，空心球由纳米棒组成。在实验结果的基础上提出了一种可能的MnO 2空心球生长机理。Fe ~（3+）离子在控制空心MnO_2球的生长过程中起着至关重要的作用。电化学性能测试表明，在Na 2SO 4溶液中，当扫描速率为10 mV s（-1）时，所合成的MnO 2空心球具有理想的电容行为和良好的循环稳定性。添加Fe ~（3+）离子的样品比未添加Fe ~（3+）离子的样品的比电容提高了3倍。(C)2010 Elsevier B. V.保留所有权利。
Hollow MnO2 spheres were successfully prepared via a simple hydrothermal method at 150 degrees C within 20 min, without assistance of any templates or surfactants, just by appending Fe3+ ions to a mixed system of KMnO4 and MnSO4. The obtained samples were systemically characterized by XRD, SEM, TEM. N-2 adsorption-desorption and element analyses. Results show that the MnO2 sample has hierarchical hollow sphere morphology and the hollow sphere is consisted of nanorods. A possible growth mechanism of hollow MnO2 spheres is proposed on the basis of the experimental results. Fe3+ ions are found to be crucial in controlling the growth of hollow MnO2 spheres. The electrochemical performance indicates that the synthesized hollow MnO2 spheres show an ideal capacitive behavior and good cycling stability at a sweep rate of 10 mV s(-1) in a Na2SO4 solution. The specific capacitance of the samples by adding Fe3+ ion is found to be three times higher than the samples without adding iron ion. (C) 2010 Elsevier B.V. All rights reserved.