基于石墨烯电极的埃洛石/聚苯胺超高柔性复合电极  

Ultra-flexible halloysite/polyaniline composite electrode based on graphene electrode

作　　者：冯准 FENG Zhun(Liaoning Railway Vocational and Technical College,Jinzhou 121000,Liaoning,China)

机构地区：[1]辽宁铁道职业技术学院,辽宁锦州121000

出　　处：《储能科学与技术》2023年第6期1794-1803,共10页Energy Storage Science and Technology

摘　　要：导电聚合物聚苯胺(PANI)具有理论电容大、制备成本低、容易大规模合成等优点,在超级电容器领域具有巨大的应用潜力。然而纯的PANI结构致密,实际电容有限,限制了其在电化学储能器件中的应用。本研究利用工艺简单且成本较低的化学氧化聚合法制备了基于无机中空管状埃洛石和导电聚合物PANI的纳米复合物,并将其浇注在石墨烯电极上制备高柔性超级电容器电极。通过扫描电镜对产物的微观形貌进行分析,可以看到PANI均匀包覆在埃洛石管壁上,形成多级分层的核壳结构。基于此,电极材料与电解液的有效接触面积明显增大,得到的埃洛石/聚苯胺电极在1 A/g的电流密度下呈现出超高的电容值(446.1 F/g),并且在10 A/g的高电流密度下仍然具有良好的倍率性能和循环稳定性(循环1600次后保留初始电容值的90.5%)。此外,由于石墨烯基底与PANI之间存在的π-π堆积作用,PANI在反复弯折过程中能紧紧黏附在石墨烯电极上,进而展现出超高的耐弯折性能(5000次弯折,电容保留率90.2%)。本方法制备的复合电极具有卓越的电化学性能,为制备导电聚合物基高柔性超级电容器提供了参考。Conductive polymer polyaniline(PANI)has many advantages,such as large theoretical capacitance,low preparation cost,and ease of synthesis on a large scale.However,the ion transport layer of pure PANI has a compact structure,limiting its application in practice.Herein,the nanocomposites based on inorganic hollow tubular halloysite and conductive polymer polyaniline were prepared by chemical oxidation polymerization with a simple process and low cost.Furthermore,the composites were poured on the graphene electrode to prepare a highly flexible supercapacitor electrode.In analyzing the product's microscopic morphology,it can be observed that polyaniline is uniformly coated on the wall of the halloysite tube,forming a hierarchical core-shell structure.Based on this,the effective contact area between the electrode material and the electrolyte is significantly increased.The resulting halloysite/polyaniline electrode shows an ultra-high capacitance value of 446.1 F/g at a current density of 1 A/g.Even being charged and discharged at an ultra-high current density of 10 A/g,it still has good rate performance and cycle stability and can retain 90.5%of the initial capacitance value after 1600 cycles. In addition, due to the π-π stacking effect between the graphene substrate and PANI, PANI can tightly adhere to the graphene electrode during the repeated bending process, thus obtaining ultra-high bending resistance (keeping 90.2% after 5000 bending cycles). Therefore, the electrode prepared by this method can exhibit excellent electrochemical performance, providing a reference for preparing highly flexible supercapacitors based on conductive polymers.

关 键 词：石墨烯电极 埃洛石 聚苯胺 分层核壳结构 柔性电容器电极 

分 类 号：TB332[一般工业技术—材料科学与工程] TB34TB324