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[emim]OTf離子液體中鍍鈮不銹鋼雙極板在PEMFC環(huán)境中的電化學行為
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國家高技術研究發(fā)展計劃項目 (2009AA05Z120)


Electrochemical Behavior of Stainless Steel with Niobium Electrodeposited in [emim]OTf Ionic Liquids in PEMFC Environment
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    摘要:

    以對水和空氣穩(wěn)定的離子液體1-乙基-3-甲基咪唑三氟甲磺酸鹽（[emim]OTf）為電解質(zhì)，在不銹鋼雙極板表面電沉積鈮, 并在模擬質(zhì)子交換膜燃料電池（PEMFC）環(huán)境中研究了鍍鈮改性的雙極板的電化學行為。結果表明, 鈮鍍層以孤島的形式均勻分布在不銹鋼表面，其高度在100 nm以內(nèi)。XPS、XRD測試結果表明，鍍鈮不銹鋼表面生成化學惰性良好的NbO、Nb2O5。在模擬陽極環(huán)境中，鍍鈮不銹鋼的腐蝕電位比不銹鋼的腐蝕電位提高530 mV；恒電位–0.1 V時電流密度從4.5315 μA·cm-2降低到2.7554 μA·cm-2；在模擬陰極環(huán)境中，鍍鈮不銹鋼的腐蝕電位比不銹鋼提高430 mV，恒定電位0.6 V時電流密度從4.4008 μA·cm-2降低到0.0028 μA·cm-2。電化學測試結果表明，鍍鈮不銹鋼的電化學極化性能得到改善，反應電阻增大，提高了耐蝕性能

    Abstract:

    In order to enhance the corrosion resistance of 304 stainless steel, niobium was electrodeposited on its surface in air-and-water-stable 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate ([emim]OTF) ionic liquids. The electrochemical behaviors of bare and niobium coated 304 stainless steel were evaluated by electrochemical tests in simulated PEMFC environment. The results show that deposited niobium is finely dispersed on the surface of 304 stainless steel as isolated islands and that the height of isolated island is within 100 nm. The result of X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD) manifest that the smooth and strong chemical inertness compound film is obtained on the surface of 304 stainless steel, which is mainly composed of NbO and Nb2O5. The thin composite film acts as barrier and remarkably improves the corrosion resistance of 304 stainless steel in PEMFC environment

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曹彩紅,梁成浩,黃乃寶.[emim]OTf離子液體中鍍鈮不銹鋼雙極板在PEMFC環(huán)境中的電化學行為[J].稀有金屬材料與工程,2013,42(3):569~573.[Cao Caihong, Liang Chenghao, Huang Naibao. Electrochemical Behavior of Stainless Steel with Niobium Electrodeposited in [emim]OTf Ionic Liquids in PEMFC Environment[J]. Rare Metal Materials and Engineering,2013,42(3):569~573.]
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  • 收稿日期:2012-02-01
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