CoAl-LDH/MWCNTs:复合材料的可控合成及其超级电容器特性  

Controllable Synthesis of CoAl-LDH/MWCNTs as a Novel Electrode Material for Supercapacitors

作　　者：黄琪[1] 陈诚[1] 刘开宇[1] HUANG Qi CHEN Cheng LIU Kaiyu(Central South University, Changsha, Hunan 410083 , China)

机构地区：[1]中南大学,湖南长沙410083

出　　处：《龙岩学院学报》2016年第5期1-7,共7页Journal of Longyan University

摘　　要：以AlOOH溶胶作为铝源,通过共沉淀的方法将多壁碳纳米管(MWCNTs)嵌入到钴铝层状双金属氢氧化物(CoAl-LDH)片间,设计合成了CoAl-LDH/MWCNTs复合材料。使用X-射线衍射(XRD)、傅里叶红外光谱(FT-IR)和透射电镜(TEM)等手段对复合材料的微观组织结构和表面形貌进行了表征。通过循环伏安、恒流充放电以及交流阻抗谱等测试方法对材料的电化学性能进行了研究。在1 A/g的电流密度下,复合材料的可逆比容量达到了666 F/g;在10 A/g的电流密度下,可逆比容量为520 F/g,表明材料具备很好的大电流充放电性能。循环性能测试表明:在2 A/g的电流密度下,经1000次循环充放电后,复合材料的比容量为776 F/g,容量保持率达97%。研究工作表明,CoAl-LDH/MWCNTs复合材料在比容量、倍率性能以及循环稳定性上都明显优于纯的钴铝水滑石。This paper presents a new design route to fabricate cobalt aluminum-layered double hydroxide （CoAl-LDH） thin layers between which multi-walled carbon nanotubes （MWCNTs） are intercalated by a coprecipitation method with AlOOH sol as aluminum source. The synthesized composites were characterized by XRD, FT-IR, TEM and so on. The electrochemical performance was studied by cyclic voltammetry, constant current charge - discharge and AC impedance spectroscopy. The galvanostatic charge-discharge test of the CoAl-LDH/MWCNTs composite shows a great specific capacitance of 666 F/g at 1 A/g in 6 M KOH solution, and the composite displays a specific capacitance of 520 F/g even at a high current density of 10 A/g, and the retention rate of specific capacitance remains at 78.1%. Moreover, the composite gets the best specific capacitance of 800 F/g at the 450 th cycle, and remains a specific capacitance of 776 F/g after 1000 cycles at 2 A/g, and the retention rate of specific capacitance remains at 97%, indicating that the composite has high specific capacitance, good rate capability and excellent cycling stability.

关 键 词：钴铝双金属氢氧化物 多壁碳纳米管 超级电容器 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]