导电聚苯胺膜在模拟PEMFC环境下的腐蚀性能  

Corrosion performance of conductive polyaniline film under simulating environment of PEMFC

作　　者：李新[1] 周婉秋[1] 黄婷婷[1] 武士威[1] 康艳红[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2014年第4期557-560,共4页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(50971093);沈阳师范大学实验中心主任基金资助项目(SYZX1103)

摘　　要：在由0.5mol/L H2SO4和0.5mol/L苯胺组成的溶液体系中,采用恒电位方法在316L不锈钢双极板表面电化学合成了导电聚苯胺(PANI)薄膜。用红外光谱技术研究了聚苯胺膜的化学键和状态,用扫描电子显微镜观察了聚苯胺膜的表面形貌。以1mol/L H2SO4及2ppM NaF的混合溶液作为模拟质子交换膜燃料电池(PEMFC)工作条件下的腐蚀介质,控制温度在70℃,用电化学技术研究了聚苯胺膜的腐蚀行为。红外光谱测量结果显示,不锈钢基底上沉积的聚合物膜是聚苯胺。扫描电子显微镜观察表明,在0.8V电压下得到的聚苯胺膜较为均匀致密。极化曲线和电化学阻抗测量结果表明,聚苯胺膜能够显著提高不锈钢双极板的耐腐蚀性能。Polyaniline （PANI） conducting polymer coating was electrochemical synthesized on the surface of 316L stainless steel bipolar plates by using constant potential method in a solution containing 0. 5 mol/L H2 SO4 and 0. 5 mol/L aniline. The chemical bonds and state of PANI was investigated using infrared spectroscopy （IR） technology. The surface morphology of the PANI coating was observed using scanning electron microscope （SEM）. Corrosion behaviors of PAN1 coating were investigated using electrochemical technique under simulating polymer electrolyte membrane fuel cells （PEMFC） working conditions, the mixed solution of 1 mol/L H2 SO4 and 2 ppm NaF was adopted as corrosion medium, and the temperature was controlled at 70 ℃. The results of IR shows that the polymer coating deposited on the stainless steel basement is PANI. SEM observation indicates that PANI coating obtained at 0.8 V was comparatively uniform and compact. The measurement results of polarization curve and electrochemical impedance spectrum indicate that the PANI coating can improve the anti--corrosion performance of stainless steel bipolar plates obviously.

关 键 词：质子交换膜燃料电池 不锈钢双极板 导电聚苯胺膜 腐蚀行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]