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Electrochemical Behavior and Specific Capacitance of Polyaniline/Silver Nanoparticle/Multi-walled Carbon Nanotube Composites
Jia Li,Di Zhang,Jin-bao Guo,Jie Wei*
Author NameAffiliationE-mail
Jia Li College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China  
Di Zhang College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China  
Jin-bao Guo College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China  
Jie Wei* College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China weij@mail.buct.edu.cn 
Abstract:
In this work, we fabricated the polyaniline/silver nanoparticle/multi-walled carbon nanotube (PANI/Ag/MWCNT) composites by in situ polymerization of aniline on the wall of Ag/MWCNTs with different aniline to Ag/MWCNT mass ratios. The chemical structure of the ternary composites was characterized by Fourier transform infrared spectroscopy, Xray diffraction, and X-ray photoelectron spectroscopy. Scanning electron microscope and high-resolution transmission electron microscopy were used to observe the morphology of the ternary composites. The results showed that the polyaniline PANI layer was prepared successfully and it covered Ag/MWCNTs completely. In addition, Ag nanoparticles between the MWCNT core and the PANI layer existed in the form of elemental crystal, which could contribute to the electrochemical performance of the composites. Then we prepared the composite electrodes and studied their electrochemical behaviors in 1 mol/L KOH. It was found that these composite electrodes had very low impedance, and exhibited lower resistance, higher electrochemical activity, and better cyclic stability compared with pure PANI electrode. Particularly, when the mass ratio of aniline to Ag/MWCNTs was 5:5, the composite electrode displayed a small equivalent series resistance (0.23 Ω) and low interfacial charge transfer resistance (<0.25 Ω), as well as 160 F/g of the maximum specific capacitance at a current density of 0.25 A/g in KOH solution. We could conclude that the composite material had potential applications as cathode materials for lithium batteries and supercapacitors.
Key words:  Carbon nanotubes, Silver nanoparticles, Polyaniline, Electrochemical behaviors
FundProject:
三元复合材料PANI/Ag/MWNT的电化学行为和比电容
李嘉,张迪,郭金宝,魏杰*
摘要:
通过原位聚合的方式在银纳米粒子/多壁碳纳米管(Ag/MWCNT)复合材料的表面成功聚合苯胺单体制备了聚苯胺/银纳米粒子/多壁碳纳米管(PANI/Ag/MWCNT)三元复合材料苯.通过对三元复合材料的结构以及表面形貌进行分析,表明聚苯胺层完全包覆了Ag/MWCNT复合材料,形成了核壳式结构.同时银纳米粒子则以单质晶体的形态存在于多壁碳纳米管与聚苯胺层之间.三元复合材料电极在1 mol/L的KOH溶液中具有极低的阻抗,而与聚苯胺电极相比,这些复合材料电极则表现出更低的电阻、更高的电化学活性和更好的循环稳定性.尤其是当苯胺和Ag:MWCNTs质量比为5:5时,该复合材料电极在0.25 A/g的电流密度下表现出最大的比电容值为160 F/g.
关键词:  碳纳米管,银纳米粒子,聚苯胺,电化学行为
DOI:10.1063/1674-0068/27/06/718-724
分类号: