导电聚吡咯的电化学性能研究
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摘要
针对聚吡咯(PPy)材料的电化学性能问题,对PPy的制备工艺过程、氧化还原反应、交流阻抗及阶跃响应进行了研究。采用电化学工作站中的计时电位法在镀铜的聚偏二氟乙烯(PVDF)膜表面制备PPy膜,结合循环伏安法(CV曲线)分析了其氧化还原反应,探究了驱动器内部离子迁移过程,分析了引起PPy膜膨胀收缩的机理,并计算了不同扫速下的比电容;利用交流阻抗谱(EIS)测试PPy的阻抗,采用ZSimpwin软件建立了等效电路模型,并根据拟合后的数据计算了电导率;之后对PPy进行了恒电位阶跃测试,探究了充放电时间常数。研究结果表明:循环伏安测试能有效地描述PPy膜的氧化还原状态及内部离子的迁移,交流阻抗测试可将PPy的阻抗电路等效为R(C(RW))电路,恒电位阶跃曲线能准确描述PPy膜的充放电时间常数。
Aiming at the electrochemical performance of polypyrrole( PPy),the preparation process,redox reaction,AC impedance and step response of PPy were studied. The polypyrrole( PPy) film was prepared on the surface of polydual vinylidene fluoride( PVDF) film by electrodeposition in the electrochemical workstation. The redox reaction was analyzed by cyclic voltammetry( CV curve),the internal ion migration process was explored,the expansion and contraction of PPy was analyzed,and the capacity under different sweep was calculated. The impedance of the PPy was tested by AC impedance spectroscopy( EIS),the equivalent circuit model was established by ZSimpwin software and the conductivity was calculated according to the fitted data. Then,the charge time constant of PPy was investigated. The results indicate that the cyclic voltammetry can effectively describe the redox state and the migration of the internal ions of the PPy film. The AC impedance test can be equivalent to the R( C( RW)) circuit of the PPy,the constant potential step curve can accurately describe the PPy film charge and discharge time constant.
Aiming at the electrochemical performance of polypyrrole( PPy),the preparation process,redox reaction,AC impedance and step response of PPy were studied. The polypyrrole( PPy) film was prepared on the surface of polydual vinylidene fluoride( PVDF) film by electrodeposition in the electrochemical workstation. The redox reaction was analyzed by cyclic voltammetry( CV curve),the internal ion migration process was explored,the expansion and contraction of PPy was analyzed,and the capacity under different sweep was calculated. The impedance of the PPy was tested by AC impedance spectroscopy( EIS),the equivalent circuit model was established by ZSimpwin software and the conductivity was calculated according to the fitted data. Then,the charge time constant of PPy was investigated. The results indicate that the cyclic voltammetry can effectively describe the redox state and the migration of the internal ions of the PPy film. The AC impedance test can be equivalent to the R( C( RW)) circuit of the PPy,the constant potential step curve can accurately describe the PPy film charge and discharge time constant.
引文
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[2]贺曦敏.以导电聚合物构建的驱动器的制备与性能研究[D].北京:清华大学机械工程学院,2006.
[3]ALICI G,HUYNH N N.Performance quantification of conducting polymer actuators for real applications:A microgripping system[J].IEEE/ASME Transactions on mechatronics,2007,12(1):73-84.
[4]ALICI G,PUNNING A,SHEA H R.Enhancement of actuation of ionic-type conducting polymer actuators using metal ion implantation[J].Sensors and Actuators B:Chemical,2011,157(1):72-84.
[5]WU Y,ALICI G,SPINKS G M,et al.Fast trilayer polypyrrole bending actuators for high speed applications[J].Synthetic Metals,2006,156(1):1017-1022.
[6]FANG Yang,TAN Xiao-bo.A novel diaphragm micropump actuated by conjugated polymer petals:fabrication,modeling and experimental results[J].Sensors and Actuators A:Physical,2010,158(2):121-131.
[7]JIANG L,WOLCOTT M P,ZHANG J.Study of biodegradable polyactide/poly(butylencs adipate-co-terephthalate)blends[J].Biotnacrotnolccules,2006,7(1):199-207.
[8]GIL M,GABRIEL J.Conducting polymer actuators:from basic concepts to proprioceptive systems[J].Universidad Politechica De Cartagena,2015,76(12E):274.
[9]MADDEN J D,KANIGAN T S,LAPONTAINE S,et al.Conducting polymer actuator[P].United States Patent:6249076,2001-6-19.
[10]FANG Y,TAN X,SHEN Y,et al.A scalable model for trilayer conjugated polymer actyators and its experimental validation[J].Materials Science&Engineering C,2008,28(3):421-428.
[11]FANG Y,TAN Xiao-bo,ALICI G.Redox level-dependent impedance model for conjugated polymer actuators[J].Sensors and Actuators B:Chemical,2008,132(1):182-190.
[12]KHALILI N,NAGUIB H E,KWON R H.Transmission line circuit model of a PPy based trilayer mechanical sensor[J].Proceedings of the SPIE,2015(9930):9.
[13]任莉君.导电聚合物复合膜修饰电极及其电化学性能研究[D].兰州:西北师范大学化学化工学院,2007.
[14]曹楚南,张鉴清.电化学阻抗谱导论[M].2版.北京:科学出版社,2002.
[15]LI X,RONG J,WEI B.Electrochemical behavior of single-walled carbon nanotube supercapacitors under compressive stress[J].ACS Nano,2010,4(10):6039-6049.
[16]何青松.IPMC人工肌肉界面与材料设计、力电建模及仿生应用研究[D].南京:南京航空航天大学机电学院,2015.
[17]WANG J P,XU Y L,WANG J,et al.High charge/discharge rate polypyrrole films prepared by pulse current polymerization[J].Synthetic Metals,2010,160(17-18):1826-1831.
[18]岳彬彬.可拉伸超级电容器电极用聚吡咯涂层织物的研究[D].上海:东华大学纺织工程学院,2013.