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

doi:10.11896/cldb.19050045

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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.

Key words： bipolar plate polyaniline film ionic liquid doping corrosion resistance

Published: 29 May 2020

CLC number:

TG174.4

Fund:This work was financially supported by the Basic Research Project of Key Laboratory of Education Department of Liaoning Province of China (LZ2015066).

About author:: Wanqiu Zhou received her Ph. D. degree in material science from the Institute of Metal Research, Chinese Academy of Sciences in 2004. She is currently a professor of Shenyang Normal University. Her main research direction is corrosion mechanism and protection techno-logy of metal materials. Her early researches focused on the preparation and corrosion protection mechanism of conversion coating on the surface of magnesium alloys. Recently, her researches focus on the electrochemical synthesis and corrosion behavior of conductive polymers. She has presided over 2 projects of National Natural Science Foundation of China, 1 Basic Research Project of Key Laboratory of Education Department of Liaoning Pro-vince, participated in 3 projects of national 863 plan, and published more than 50 papers.

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	ZHOU Wanqiu
	ZHAO Yuming
	LIU Xiao'an
	YANG Jiayu
	JIANG Wenyin
	XIN Shigang
	KANG Yanhong

Cite this article:

ZHOU Wanqiu,ZHAO Yuming,LIU Xiao'an, et al. Electrosynthesis of Polyaniline Film in a 1-ethyl-3-methylimidazole Sulfate Ionic Liquid and Its Corrosion Resistance[J]. Materials Reports, 2020, 34(12): 12152-12157.

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http://www.mater-rep.com/EN/10.11896/cldb.19050045 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12152

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