循环伏安法合成导电聚苯胺导电性及热稳定性  

Electrical conductivity and thermal stability of conductive polyaniline synthesized by cyclic voltammetry

作　　者：周婉秋[1] 王宇玲[1] 赵玉明[1] 孙秋菊[1] 辛士刚[1] 张洪波[1] 

机构地区：[1]沈阳师范大学化学化工学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2017年第1期29-33,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省教育厅重点实验室基础研究项目(LZ2015066)

摘　　要：聚苯胺近年来在金属防腐领域备受关注,在质子交换膜燃料电池(PEMFC)不锈钢双极板表面电化学沉积聚苯胺薄膜,能够进一步提高双极板的耐腐蚀性能,有望替代传统的石墨双极板在PEMFC中得到应用。电池工作条件下要求双极板具有导电性,工作温度在70~100℃,因此研究聚苯胺薄膜的导电性和热稳定性十分必要。采用循环伏安法,在0.2mol/L H_2SO_4和0.1mol/L苯胺组成的水溶液体系中,在316L不锈钢表面制备了聚苯胺(PANI)薄膜;采用红外光谱研究PANI薄膜的化学结构;采用四探针技术测量PANI的电导率;采用热重分析技术研究了PANI的热稳定性;采用扫描电镜观察表面形貌。结果表明:聚苯胺薄膜的电导率最大值达到8.96S/cm,分解温度为352.7℃,表面呈现纤维状簇集状态,颗粒分布比较均匀。In recent years,the application of polyaniline in the field of metal corrosion protection has been paid much attention.Electrochemical deposition of polyaniline coating on the surface of stainless steel（SS）plate is expected to further improve the corrosion resistance of stainless steel bipolar plate,and replace traditional graphite bipolar plate in proton exchange membrane fuel cell（PEMFC）.In the working condition of PEMFC,the bipolar plate is required to have electrical conductivity in the working temperature between 70 and 100℃.It is necessary to investigate the electrical conductivity and thermal stability of the polyaniline film.A conductive polyaniline coating was prepared on the surface of 316 LSS bipolar plate in a bath containing 0.2mol/L sulfuric acid and 0.1 mol/L anline using cyclic voltammetry technique.The chemical structure of synthetic polyaniline thin film was studied by infrared spectrascopy（IR）,the electrical conductivity of the coating was tested by four-probe technique, the thermal stability was investigated by thermogravimetric analysis（TG）,and the surface morphologies were observed by scanning electron microscope（SEM）.The results show that the electrical conductivity of PANI is at the maximum of8.96S/cm,decomposition temperature is 352.7 ℃,the coating surface presents fibrous cluster state and the grain is relatively uniform.

关 键 词：导电聚苯胺 循环伏安法 热稳定性 导电性 双极板 

分 类 号：TB333[一般工业技术—材料科学与工程]