Abstract: To expand the practical application of proton exchange membrane fuel cell (PEMFC), it is important to improve the corrosion resistance of its bipolar plate. Electrochemical deposition of conductive polyaniline (PANI) films on stainless steel (SS) substrate may meet the requirements of PEMFC for conductivity and corrosion resistance. Previous studies on electrochemical synthesis of PANI mainly focused on aqueous systems such as sulfuric acid and perchloric acid, and few studies involved in electrosynthesis of PANI films in ionic liquids and their corrosion resistance. In this work, PANI films were synthesized by cyclic voltammetry on the surface of 316L SS using 1-ethyl-3-methylimidazole ethyl sulfate (EMIES) ionic liquid as the polymerization electrolyte, and the PANI/316L SS composite materials bipolar plates were prepared. The structure of PANI was characterized by infrared spectrum, Raman spectroscopy, ultraviolet-visible spectrum, X-ray photoelectron spectrum and scanning electron microscope. The corrosion performance of PANI/316L SS was studied by open circuit potential, polarization curve and electrochemical impedance spectroscopy. The results show that PANI has an intermediate oxidation state structure, the anion of the ionic liquid EMIES (CH3CH2SO4-) and the anion of oxalic acid (HOOC-COO-) as “counter anion” are co-doped in PANI conjugated molecular chains. A flat and compact PANI film is obtained on the surface of 316L SS. Compared with 316L SS bare metal, the corrosion potential E0 of PANI/316L SS increases by 0.2—0.4 V, and the corrosion current density I0 decreases by an order of magnitude. PANI film improves the corrosion resistance of 316L stainless steel obviously.
周婉秋, 赵玉明, 刘晓安, 杨佳宇, 姜文印, 辛士刚, 康艳红. 1-乙基-3-甲基咪唑硫酸乙酯盐离子液体中采用电化学法合成聚苯胺薄膜及其耐蚀性[J]. 材料导报, 2020, 34(12): 12152-12157.
ZHOU Wanqiu, ZHAO Yuming, LIU Xiao'an, YANG Jiayu, JIANG Wenyin, XIN Shigang, KANG Yanhong. Electrosynthesis of Polyaniline Film in a 1-ethyl-3-methylimidazole Sulfate Ionic Liquid and Its Corrosion Resistance. Materials Reports, 2020, 34(12): 12152-12157.
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