Molybdenum nitride modified AISI 304 stainless steel bipolar plate for proton exchange membrane fuel cell

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• 作者：Lixia Wang ; Juncai Sun ; ^{sunjc@dlmu.edu.cn} ; Pengbin Li ; Jing Sun ; Ying Lv ; Bo Jing ; Song Li ; Shijun Ji ; Zhongsheng Wen
• 关键词：PEMFC ; Bipolar plates ; Molybdenum nitride ; Interfacial contact resistance ; Corrosion resistance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5876-5883
• 文件大小：901 K

摘要

A molybdenum nitride diffusion coating has been prepared on the surface of AISI 304 stainless steel (304 SS) by plasma surface diffusion alloying method as bipolar plate for proton exchange membrane fuel cell (PEMFC). X-ray diffraction data shows that the molybdenum nitride is face-centered-cubic Mo₂N phase. The results of scanning electron microscopy in combination with energy-dispersive X-ray analysis spectrometer indicate that the as-prepared molybdenum nitride diffusion coating consists of a 鈭?.5聽渭m surface layer (molybdenum nitride) and a 鈭?.5聽渭m subsurface layer (Mo and N solid solution). In addition, the average contact angle with water for modified 304 SS is 91掳, demonstrating the better hydrophobic property of the surface modified 304 SS as compared to the untreated ones with average contact angle of 68掳. Potentiodynamic and potentiostatic testing in simulated PEFMC operating conditions (0.05聽M聽H₂SO₄聽+聽2聽ppm聽F^{鈭?/sup> solution at 70聽掳C purged with either hydrogen or air) as well as interfacial contact resistance (ICR) measurement imply that the molybdenum nitride modified 304 SS exhibits improved corrosion resistance and promising ICR.}