【摘要】 目的 为了提高双极板在质子交换膜燃料电池（PEMFC）工作环境下的耐蚀性。方法 在1-乙基-3-甲基咪唑磷酸二乙酯盐（[EMIM][DEP]）离子液体中，在316 L不锈钢（SS）基体上电聚合聚苯胺（PANI）膜。用红外光谱（FTIR）、拉曼光谱（Raman）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）进行微观结构表征。通入氢气（H2）模拟阳极反应气氛，控制电位为-0.1 V（vs. SCE），模拟阳极工作电位，采用开路电位（OCP）、电化学阻抗谱（EIS）和极化曲线研究H₂对PANI/316 L SS双极板腐蚀性能的影响。结果 FTIR显示有苯环、醌环、P==O和—COOH伸缩振动，Raman显示有掺杂态半醌自由基C—N+·伸缩振动，XPS表明PANI膜含有C、N、O和P等元素。极化曲线腐蚀电流密度按照H₂>N₂>O₂（DO）依次增大，EIS容抗弧半径按照H₂<N₂<O₂O₂（DO）依次减小。H2环境使PANI/316 L SS体系OCP下降0.06 V，电荷转移电阻（Rct）值下降55?/cm²，自腐蚀电位下降0.3 V左右。结论 PANI具有中间氧化态结构，（CH₃CH₂）₂PO₄^-和HOOC—COO-作为“对阴离子”在PANI中发生共掺杂。在PEMFC阳极工作电位下，H₂对PANI/316 L SS耐蚀性有显著影响，H2使PANI膜发生还原，—N⁺==与—N⁺H—的和与总N原子含量的比值（N⁺/N值）下降1.4%，导致PANI分子链中的“对阴离子”发生脱掺杂，PANI/316 L SS体系耐蚀性下降。更多还原

【Abstract】 The work aims to improve the corrosion resistance of bipolar plates in the working environment of proton exchange membrane fuel cell（PEMFC）.Polyaniline（PANI） films were electropolymerized on 316 L stainless steel（SS） matrix in 1-ethyl3-methylimidazole diethyl phosphate（[EMIM][DEP]） ionic liquid.The microstructure was characterized by infrared spectroscopy（FTIR）,Raman spectroscopy（Raman）,X-ray photoelectron spectroscopy（XPS） and scanning electron microscopy（SEM）.Hydrogen（H₂） was injected to simulate the anode reaction atmosphere,and the potential was controlled at-0.1 V（vs.SCE） to simulate the anode working potential.Open circuit potential（OCP）,EIS and polarization curves were used to study the effect of H₂ on the corrosion performance of bipolar plates.The results indicated that FTIR showed benzene ring,quinone ring,P==O and —COOH stretching vibration,Raman showed doped semi-quinone radical C—N+ stretching vibration,and XPS showed that PANI film contained C,N,O and P elements.The corrosion current density of the polarization curve increased in order of H₂>N₂>O₂（DO）,and the radius of the EIS capacitive reactance arc decreased in order of H₂<N₂<O₂（DO）.The H₂ environment caused the OCP of PANI/316 L SS system to drop by 0.06 V,the charge transfer resistance（Rct） value to drop by 55?/cm2,and the self-corrosion potential to drop by about 0.3 V.It is concluded that PANI has an intermediate oxidation state structure.（CH₃CH₂）₂PO₄^- and HOOC—COO-are co-doped in PANI as “counter anions”.Under the PEMFC anode working potential,H₂ has significant effect on the corrosion resistance of PANI/316 L SS.H₂ results in the reduction of PANI and the ratio of the sum of —N⁺== and —N⁺H— to the total N atom content（N⁺/N value） decreases by 1.4%,which leads to the de-doping of the “counter anions” in the PANI molecular chains,and the decrease of the corrosion resistance of PANI/316 L SS system.更多还原