摘要
采用两步合成法制备了MnO_2/NiCo_2O_4核壳结构纳米棒,使用场发射扫描电子显微镜、X射线衍射和电化学工作站研究了其形貌特征和电化学性能。研究结果表明,在α-MnO_2纳米棒上生长了均匀的NiCo_2O_4纳米片,这种核壳结构纳米棒所制备的电极在充放电电流密度为0.5A/g时比电容达到了434F/g,明显比纯α-MnO_2的比电容(256F/g)高,循环测试2 000次后,比电容保留量为91.8%,表现出了优秀的电化学性能,具有广阔的应用前景。
MnO2/NiCo2O4 core-shell nanorods were prepared by a two-step synthesis method.The morphological and electrochemical properties of MnO2/NiCo2O4 nanorods were studied by field emission scanning electron microscopy（FE-SEM）,X-ray diffraction（XRD）and electrochemical workstation.The results showed that the NiCo2O4 nanosheets are grown on theα-MnO2 nanorods＇ surface.The electrochemical test＇s results showed that this MnO2/NiCo2O4 composites display specific capacitance（434 F/g at current density of 0.5 A/g）,better than pureα-MnO2（256 F/g）.After cycling 2 000 times,the capacitance retention still maintained91.8%,These attractive findings suggest this novel core-shell nanorods promising for electrochemical applications as an efficient supercapacitive electrode.
作者
冯冬冬
王伟
艾超前
FENG Dongdong 1,2 , WANG Wei 1,2 , AI Chaoqian 1,2(1 College of Environment Science and Engineering, Chang＇an University, Xi＇an 710054; 2 Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang＇an University, Xi＇an 71005)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第A01期1-4,9,共5页
Materials Reports
基金
国家自然科学基金(51678059)
陕西省自然科学基金(2016JM5065)
中央高校基本科研业务费(310829161012)
教育部留学回国人员科研启动基金
国土资源部退化及未利用土地整治工程重点实验室开放基金(SXDJ2017-1)
关键词
超级电容器
二氧化锰
钴酸镍
纳米棒
核壳结构
supercapacitors
manganese oxides
spinel nickel cobaltate
nanorods
core shell nanostructure
