摘要
在冰水浴条件下,以KMnO_4、NaOH和MnCl_2为反应物,利用溶液法制得层状δ-MnO_2前驱体,然后,以NaOH为离子嵌入源,通过水热法180℃反应48h制得纳米Na0.32MnO2嵌入化合物.分别采用X-射线衍射仪、扫描电子显微镜和能谱仪表征了材料的晶型结构、形貌特征和元素组成;用循环伏安、恒流充放电和交流阻抗等电化学方法研究其电化学性能.结果表明,纳米Na_(0.32)MnO_2嵌入化合物在0.5mol·L-1 Na2SO4中,扫描速率为1mV·s-1时,比电容为79.7F·g-1,并表现出大于700次的循环稳定性.
In this paper,the layeredδ-MnO2 precursors were prepared by solution method at 0 ℃ with KMnO4,NaOH and MnCl2 as reagent.Then the nanostructured Na（0.32）MnO2 intercalation compound was synthesized by hydrothermal method using the as-preparedδ-MnO2 as precursor and NaOH as embedded ion source at 180℃ for48 h.X-ray diffractometer,scanning electron microscope and energy dispersive spectrometer were used to characterized the crystalline structure,morphology and elementary composition,respectively.The electrochemical properties were investigated by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The results show that the nanostructured Na0.32MnO2 presents the specific capacitance of 79.7 F·g-1 at the scan rate of 1 mV·s-1,the high stability of 700-cycle in the 0.5 mol·L-1 Na2SO4 aqueous solution.
作者
代芳
朱杨军
温祖标
周攀
李平
章磊
DAI Fang;ZHU Yangjun;WEN Zubiao;ZHOU Pan;LI Ping;ZHANG Lei(Jiangxi Province Key Laboratory of Precision Drive ＆ Control,Nanchang Institute of Technology,Nanchang 330099,China;College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China)
出处
《复旦学报（自然科学版）》
CAS
CSCD
北大核心
2018年第5期644-649,共6页
Journal of Fudan University：Natural Science
基金
国家自然科学基金(21463013)
江西省自然科学基金(20171BAB203013)
江西省教育厅科技项目(GJJ160290)
南昌工程学院青年基金项目(2014KJ014)
