纳米纤维素复合纸基超级电容器的制备与性能  

Preparation and Properties of Composite Paper-Based Supercapacitors with Nanocellulose

作　　者：陈港[1] 林东瀚 方志强[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2017年第9期118-127,共10页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2010CB732206);广东省部产学研专项资金技术前沿项目(2013B090500071)~~

摘　　要：以制备的纳米纤维素(NFC)、还原氧化石墨烯(RGO)及聚苯胺(PANI)为原料,按照一定的质量比进行混合超声分散,经真空抽滤得到NFC/RGO(NR)和NFC/RGO/PANI(NRP)复合纸基电极材料.探讨了NFC的羧基含量与复合纸基电极的电学性能和机械性能的关系,以获得性能更优的复合纸基电极.最后以聚乙烯醇/硫酸(PVA/H_2SO_4)为电解质,制备了NFC/RGO和NFC/RGO/PANI复合纸基超级电容器(NRS和NRPS).结果表明:通过改变NFC、RGO及PANI的质量比,NFC可以有效阻止RGO和PANI的团聚,同时其亲水特性可以有效提高电解质离子的扩散速率;NFC羧基含量增加可以提高复合材料间的结合,从而提升复合纸基电极材料的电学性能和机械性能;当NFC、RGO和PANI的质量比为5∶3∶3时,在0.5A/g电流密度下,NRPS纸基超级电容器的比电容为305F/g,经过1000次循环后其比电容仍可保留起始的98.3%,表现出良好的电化学循环稳定性.Nanocellulose( NFC)/reduced graphene oxide( RGO)( NR) and NFC/RGO/polyaniline( PANI)( NRP) paper-based electrodes were prepared by means of the ultrasonic irradiation of a suspension of nanocellulose,reduced graphene oxide( RGO) and polyaniline( PANI) and vacuum filtration. Meanwhile,the relationship between the carboxyl content of NFC and the electrical properties of the electrodes as well as that between the carboxyl content of NFC and the mechanical properties of the electrodes was discussed,so as to achieve composite paper-based electrodes of better electrochemical properties. Finally,by taking polyving akohol/sulfuric acid( PVA/H_2SO_4) as the electrolyte,two composite paper-based supercapacitors named NRS and NRPS were prepared respectively with NR and NRP. The results show that( 1) by controlling the ratio of NFC,RGO and PANI,hydrophilic NFC can effectively decrease the restacking between RGO and PANI,meanwhile,the hydrophilic properties of NFC can effectively improve the diffusion of electrolyte ions;( 2) increasing the carboxyl content of NFC helps to enhance the combination of composite materials,thus improving the electrical properties and mechanical properties of the composite paper-based electrodes; and( 3) when the mass ratio of NFC,RGO and PANI is 5∶ 3∶ 3 and the current density is 0. 5 A/g,the NRPS paper-based supercapacitor is of a specific capacitance of 305 F/g,and 98. 3% of the specific capacitance is retained after 1000 charge-discharge cycles,which means that this supercapacitor is of better electrochemical cycle stability.

关 键 词：纳米纤维素 还原氧化石墨烯 聚苯胺 复合纸基超级电容器 

分 类 号：TB332[一般工业技术—材料科学与工程]