第35卷第1期 沈阳师范大学学报(自然科学版) Vol 35 No. 1 2017年1月 ournal of Shenyang Normal University (Natural Science Edition) Jan.2017 文章 1673-5862(2017)01-0029-05 循环伏安法合成导电聚苯胺导电性及热稳定性 周婉秋,王宇玲,赵玉明,孙秋菊,辛士刚,张洪波 (沈阳师范大学化学化工学院,沈阳110034) 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/LH2SO4和 0.Imol/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(PAND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。 关键词:导电聚苯胺;循环伏安法;热稳定性;导电性;双极板 中图分类号:TB333 文献标志码:A oi:10.3969/j.issn.1673-5862,2017.01.005 Electrical conductivity and thermal stability of conductive polyaniline synthesized by cyclic voltammetry ZHOU Wanqiu, WANG Yuling, ZHAO Yuming, SUN Qiuju, XIN Shigang ZHANG Hongbo College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China Abstract: In recent years, the application of polyaniline in the field of metal corrosion protection has been paid much attention. Electrochemical deposition of poly aniline 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 C. 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 L SS bipolar plate in a bath containing 0. 2 mol/L. sulfuric acid and 0. I 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 of 8.96 S/cm, decomposition temperature is 352. 7 C, the coating surface presents fibrous cluster state and the grain is relatively uniform Key words: conductive polyaniline: cyclic voltammetry: thermal stability: electrical conductivity bipolar plate 收稿日期:2016-11-04 基金项目:辽宁省教育厅重点实验室基础研究项目(LZ2015066) 作者简介:周婉秋(1963-),女,辽宁本溪人,沈阳师范大学教授,博士。收稿日期:2016 11 04。 基金项目:辽宁省教育厅重点实验室基础研究项目(LZ2015066)。 作者简介:周婉秋(1963 ),女,辽宁本溪人,沈阳师范大学教授,博士。 第35卷 第1期 2017年 1月 沈阳师范大学学报(自然科学版) JournalofShenyangNormalUniversity (NaturalScienceEdition) Vol.35No.1 Jan.2017 文章编号:1673 5862(2017)01 0029 05 循环伏安法合成导电聚苯胺导电性及热稳定性 周婉秋,王宇玲,赵玉明,孙秋菊,辛士刚,张洪波 (沈阳师范大学 化学化工学院,沈阳 110034) 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 H2SO4 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。 关 键 词:导电聚苯胺;循环伏安法;热稳定性;导电性;双极板 中图分类号:TB333 文献标志码:A doi:10.3969/j.issn.1673 5862.2017.01.005 Electrical conductivity and thermalstability of conductive polyanilinesynthesizedbycyclicvoltammetry ZHOU Wanqiu,WANG Yuling,ZHAOYuming,SUN Qiuju,XIN Shigang, ZHANGHongbo (CollegeofChemistryandChemicalEngineering,ShenyangNormalUniversity,Shenyang110034,China) Abstract:Inrecentyears,theapplicationofpolyanilineinthefieldofmetalcorrosionprotection hasbeenpaid muchattention.Electrochemicaldepositionofpolyanilinecoatingonthesurfaceof stainlesssteel(SS)plateisexpectedtofurtherimprovethecorrosionresistanceofstainlesssteel bipolarplate,andreplacetraditionalgraphitebipolarplateinprotonexchangemembranefuelcell (PEMFC).IntheworkingconditionofPEMFC,thebipolarplateisrequiredtohaveelectrical conductivityintheworkingtemperaturebetween70and100℃.Itisnecessarytoinvestigatethe electricalconductivityandthermalstabilityofthepolyanilinefilm.Aconductivepolyanilinecoating waspreparedonthesurfaceof316LSSbipolarplateinabathcontaining0.2mol/Lsulfuricacid and0.1 mol/Lanlineusingcyclicvoltammetrytechnique.Thechemicalstructureofsynthetic polyanilinethinfilm wasstudiedbyinfraredspectrascopy (IR),theelectricalconductivityofthe coating was tested by four-probe technique, the thermal stability was investigated by thermogravimetricanalysis(TG),andthesurfacemorphologieswereobservedbyscanningelectron microscope(SEM).TheresultsshowthattheelectricalconductivityofPANIisatthemaximumof 8.96S/cm,decompositiontemperatureis352.7 ℃,thecoatingsurfacepresentsfibrouscluster stateandthegrainisrelativelyuniform. Keywords: conductive polyaniline; cyclic voltammetry; thermal stability; electrical conductivity;bipolarplate