刘晓安,周婉秋,杨佳宇,姜文印,辛士刚,康艳红,孙秋菊.电位对聚苯胺/不锈钢双极板腐蚀性能的影响[J].表面技术,2021,50(6):288-297.
LIU Xiao-an,ZHOU Wan-qiu,YANG Jia-yu,JIANG Wen-yin,XIN Shi-gang,KANG Yan-hong,SUN Qiu-ju.Effect of Potential on Corrosion Properties of Polyaniline/Stainless Steel Bipolar Plates[J].Surface Technology,2021,50(6):288-297 |
| 电位对聚苯胺/不锈钢双极板腐蚀性能的影响 |
| Effect of Potential on Corrosion Properties of Polyaniline/Stainless Steel Bipolar Plates |
| 投稿时间：2020-06-22 修订日期：2020-12-03 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.033 |
| 中文关键词: 聚苯胺 双极板 离子液体 循环伏安 电位 耐蚀性 |
| 英文关键词:polyaniline bipolar plate ionic liquid cyclic voltammetry potential corrosion resistance |
| 基金项目:辽宁省教育厅重点实验室基础研究项目(LZ 2015066) |
| 作者 | 单位 |
| 刘晓安 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 周婉秋 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 杨佳宇 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 姜文印 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 辛士刚 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 康艳红 | 沈阳师范大学 化学化工学院，沈阳 110034 |
| 孙秋菊 | 沈阳师范大学 化学化工学院，沈阳 110034 |
|
| Author | Institution |
| LIU Xiao-an | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| ZHOU Wan-qiu | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| YANG Jia-yu | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| JIANG Wen-yin | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| XIN Shi-gang | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| KANG Yan-hong | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
| SUN Qiu-ju | College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China |
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| 中文摘要: |
| 目的 增强双极板在质子交换膜燃料电池(PEMFC)工作条件下的耐腐蚀性能。方法 以1-乙基-3-甲基咪唑硫酸乙酯(EMIES)离子液体作为聚合反应电解质，采用循环伏安法在316L 不锈钢(SS)上电聚合聚苯胺(PANI)薄膜制备PANI/316L SS双极板。采用SEM观察表面形貌，采用FTIR分析官能团结构，采用XPS分析元素组成和键合状态。采用恒电位法控制PANI/316L SS电位分别为0.5、0.6、0.7 V(vs. SCE)以模拟PEMFC阴极电位，测量恒电位极化后开路电位、极化曲线和电化学阻抗谱(EIS)的变化。结果 PANI膜均匀平整局部有微裂纹。FTIR显示有苯环、醌环、S=O和—COOH伸缩振动。XPS表明PANI 膜含有C、N、O和S等元素。PANI/316L SS极化曲线在钝化区内电流密度波动较大，EIS的Nyquist图由高频容抗弧和低频直线构成，容抗弧半径随着极化电位的升高而增大。结论 PANI为中间氧化态结构，EMIES阴离子(CH3CH2SO4–)和草酸阴离子(HOOC-COO–)在PANI分子链中均有掺杂。在PEMFC阴极工作电位下PANI/316L SS处于阳极极化状态，电位对PANI/316L SS的耐蚀性影响显著，在0.6 V下PANI/316L SS呈现很好的耐蚀性，电位升高至0.7 V时，发生PANI过度氧化，导致“对阴离子”脱掺杂，使PANI/316L SS的导电性和耐蚀性下降。 |
| 英文摘要: |
| To improve corrosion resistance of the bipolar plates of proton exchange membrane fuel cell (PEMFC) at operating conditions, PANI/316L SS bipolar plates were prepared by electro-polymerization of polyaniline (PANI) thin films on 316L stainless steel (SS) by cyclic voltammetry method using 1-ethyl-3-methyl imidazole ethyl sulfate (EMIES) ionic liquid as the polymeric electrolyte. SEM was used to observe the surface morphology, FTIR was used to analyze the structure of functional groups, and XPS was used to analyze the element composition and bonding state. The potential of PANI/316L SS was controlled at 0.5, 0.6 and 0.7 V (vs. SCE) respectively by constant potential method to simulate PEMFC cathode potential, and the changes of open circuit potential, polarization curve and electrochemical impedance spectrum (EIS) after constant potential polarization were measured. The results show that there are micro-cracks in PANI films. FTIR shows benzene ring, quinone ring, S=O and —COOH stretching vibrations. XPS indicates that PANI film contains C, N, O and S elements. The current density of PANI/316L SS polarization curve fluctuates greatly in the passivation area. Nyquist plots of EIS are composed of high frequency reactance arcs and low frequency straight lines. The radius of reactance arcs increases with the increase of polarization potential. It is found that PANI shows intermediate oxidation state structure, both EMIES anion (CH3CH2SO4–) and oxalic acid anion (HOOC-COO–) is doped in the PANI molecular chains. PANI/316L SS is in anodic polarization state under PEMFC cathode working potential, and the potential has significant influence on corrosion resistance of PANI/316L SS, PANI/316L SS shows good corrosion resistance at 0.6 V, and excessive oxidation of PANI occurs when the potential increases to 0.7 V, which results in de-doping of the “counter anion” and decreasing of conductivity and corrosion resistance of PANI/316L SS. |
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