MnO_2/煤基碳纳米纤维的制备及其在柔性超级电容器中的应用  

Preparation of MnO_2/CBCNFs Composite Materials and Its Electrochemical Performance for Flexible Supercapacitor

作　　者：郭继玺[1] 宋贤丽[1] 郭明晰[1] 贾殿赠[1] 仝凤莲 Guo Jixi Song Xianli Guo Mingxi Jia Dianzeng Tong Fenglian(Key Laboratory of Energy Materials Chemistry, Ministry of Education Key Laboratory of Advanced Functional Materials, Autonomous Region Institute of Applied Chemistry, Xinjiang University, Urumqi 830046)

机构地区：[1]新疆大学应用化学研究所能源材料化学教育部重点实验室先进功能材料自治区重点实验室,乌鲁木齐830046

出　　处：《化学通报》2016年第10期942-946,951,共6页Chemistry

基　　金：国家自然科学基金-新疆联合基金重点项目(U1203292);新疆杰出青年自然科学基金项目(2013711006)资助

摘　　要：采用静电纺丝技术制备了柔性煤基碳纳米纤维(CBCNFs)。利用低温等离子体技术对CBCNFs进行改性,并将改性后的CBCNFs作为还原剂与KMn O4反应,以实现Mn O2的原位还原负载制备CBCNFs/Mn O2复合材料。通过X射线衍射、扫描电镜和透射电镜等手段对复合材料的结构与形貌进行了表征;另外,研究了其作为柔性超级电容器电极材料的性能。结果表明,KMn O4∶CBCNFs=2∶1(质量比)条件下制备的复合材料(CBCNFs/Mn O2-2)具有良好的电化学性能。在0.1A·g-1电流密度下,CBCNFs/Mn O2-2的比电容高达118F·g-1,为CBCNFs比电容(26F·g-1)的4.5倍,在1A·g-1电流密度下,循环1000次后比容量保持率为97%,表现出良好的循环稳定性。The flexible coal based carbon nanofibers （CBCNFs） were prepared by electrospinning technique and well modified by using the low temperature plasma surface modification technology. The CBCNFs/MnO2 composite was prepared by in situ reduction reaction using plasma-modified CBCNFs as reductant to react with potassium permanganate （ KMnO4 ）. The morphology and structure of as-prepared CBCNFs/MnO2 composites were investigated by X-ray diffraction （XRD） , scanning and transmission electron microscopy （SEM, TEM）. The results showed that the nanoflakes of MnO2well coated on the CBCNFs. Furthermore, the electrochemical performance of the electrode material as flexible supercapacitor was investigated. The prepared material （CBCNFs/MnO2-2） with KMnOJCBCNFs = 2/1 （mass ratio） shows good electrochemical performance. It was found that the CBCNFs/MnO2- 2 electrodes showed a specific capacitance of 118 F·g^-1 at a current density of 0. 1 A.g t , which is 4.5 times higher than that of the CBCNFs （26 F·g^-1 ）. The capacitance retention ratio of the CBCNFs/MnO2-2 remained 97% after 1000 cycles at a current density of 1 A·g^-1

关 键 词：静电纺丝 煤基碳纳米纤维 等离子体 MNO2 柔性超级电容器 

分 类 号：TQ340.1[化学工程—化纤工业] TM53[电气工程—电器]