文献类型：期刊文献

中文题名：MnO_（2）/CNTs复合材料的比表面积和负载量对超级电容器性能的影响

英文题名：Effect of Surface Area and Loading Amount on the Super-Capacitance of MnO_（2）/CNTs Composites

作者：宋雪华[1];陈启斌[1];刘洪来[1]

机构：[1]华东理工大学化学系化学工程联合国家重点实验室,上海200237

年份：2018

卷号：44

期号：1

起止页码：33

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

语种：中文

中文关键词：多壁碳纳米管(CNTs);MnO_（2）;超级电容器

外文关键词：multi walled carbon nanotubes(CNTs);MnO_(2);supercapacitors

摘要：以多壁碳纳米管(CNTs)和高锰酸钾(KMnO_4)为原料,制备了MnO_2含量不同的MnO_2/CNTs复合材料。利用场发射扫描电镜和透射电镜观察了材料形貌的变化;利用氮气等温吸附研究了MnO_2含量对复合材料的比表面积和孔容的影响;并对复合材料进行了电化学性质测试。结果发现,MnO_2含量对复合材料的纤维直径、片层厚度及比表面积的影响显著;当KMnO_4的质量是碳纳米管的10倍时,所得复合材料的电容性能最优,比电容最高可达199F/g,归一化后MnO_2比电容最高可达255F/g。研究表明,当优化电极材料性质时,更大范围内的金属氧化物含量可能会影响到复合物的微观结构。
The rapid growth of the global economy has led to a significant worldwide increase in the consumption of fossil fuels over last decades, thereby producing two major associated issues： the depletion of existing fossil fuel reserves and the affiliated environmental problem. Supercapacitors, also called as electrochemical capacitors, have attracted great attention for the application in future energy storage devices due to their high power density, long cycle life, fast charge-discharge rates, and low maintenance cost. To further enhance the energy density of supercapacitors, it is a crucial issue to design favorable micro/nano-structures for electrodes with fast ion and electron transport and high utilization rate of transition metal oxides/hydroxides. In this work, multi-walled carbon nanotubes （CNTs） and potassium permanganate （KMnO4 ） were used as raw materials to obtain MnO2/CNTs composites with different contents of MnO2 enwrapped on CNTs by a facile synthetic method. The composition, morphology, specific surface area and pore volume of electrode materials were examined via field emission scanning electron microscopy （FESEM） , transmission electron microscopy （TEM） , X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and isothermal adsorption of nitrogen. The electrochemical properties of composite materials were characterized. Results showed that the MnO2 content had a significant effect on the fiber diameter, layer thickness and specific surface of the composite materials. The composite material possessed the best performance with the highest specific capacitance （199 F/g ） and normalized specific capacitance （255 F/g） of MnO2 when the mass ratio of potassium permanganate to carbon nanotubes was 10 in the synthesis reaction. The normalized Mn0 2 specific capacitance in the MnO2 / CNT composites was compared, since it could directly reveal the utilization ratio of active materials. Our findings underscore the need for considering a broad range of MnO2/CNT combinations when optimizing a particular functional property of electrode materials. We believe that the manipulation of the structural and capacitive properties of composites via varying the MnO2/CNT combination may, in fact, be one of the most overlooked and important aspects of these novel materials.