پديد آورنده :
رجايي، وحيد
عنوان :
بررسي پوشش هاي رسوب الكتريكي نيكل - موليبدن و نيكل - موليبدن - فسفر روي فولاد زنگ نزن به منظور كاربرد در صفحات دوقطبي پيل سوختي غشاء پليمري
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب و روش ساخت مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد
صفحه شمار :
ده، 77ص.: مصور، جدول، نمودار
استاد راهنما :
كيوان رئيسي، مرتضي شمعانيان
توصيفگر ها :
رسوب دهي الكتريكي
تاريخ نمايه سازي :
1394/07/01
استاد داور :
محمد ژياني، فتح الله كريم زاده
تاريخ ورود اطلاعات :
1396/10/04
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
Investigation of the Ni Mo and Ni Mo P electrodeposition coatings on stainless steel bipolar plate for polymer electrolyte membrane fuel cells applications Vahid Rajaei Email address rajaei vahid@gmail com Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Dr K Raeissi Assoc Prof E Mail K Raeissi@cc iut ac ir Dr M Shamanian Prof E Mail Shamanian@cc iut ac ir Abstract Bipolar plates are one of the most important parts of fuel cells which their performance has appreciable effect on cell operation In this study Ni Mo and Ni Mo P alloys coatings were prepared on 304 stainless steel substrate by electrodeposition method from citrate ammonia bath by applying current densities of 30 60 and 100mA cm2 for using in bipolar plates of polymer electrolyte membrane fuel cell Prepared coatings were uniform and compact Moreover molybdenum content of Ni Mo alloys decreased with increasing current density On the contrary composition of the Ni Mo P coatings did not change significantly X ray diffraction analysis indicated that all coatings were composed of a solid solution which Ni Mo coatings had nanocrystalline structure with grain size of 47 90 and Ni Mo P coatings had amorphous nanocrystalline structure In addition hydrophobicity of substrate was increased with preparing Ni Mo and Ni Mo P coatings Results of Tafel polarization and electrochemical impedance spectroscopy in simulated solution of fuel cell showed that the solution could not reach the substrate and also polarization resistance as well as corrosion current density in open circuit potential was improved compared with substrate Investigation of potentiostatic results in cathodic condition showed that Ni Mo P coatings had almost equal corrosion current density after 4 hours of polarization On the other hand corrosion current density was decreased with increasing Mo content of Ni Mo coatings Investigation of interfacial contact resistance ICR of bare substrate and Ni Mo coated substrate prepared at 30 mA cm2 and Ni Mo P coated substrate prepared at 100 mA cm2 showed decrease in ICR of substrate with applying the coatings Moreover after potentiostatic test of bare 304SS and Ni Mo P coated substrate prepared at 100 mA cm2 had the maximum and minimum ICR between mentioned samples respectively Investigation of performance of bipolar plates in practical conditions of polymer electrolyte membrane fuel cell indicated that the output voltage for substrate decreased faster compared with coated Ni Mo P coating obtained at 100mA cm2 In addition only activation and ohmic polarization regions were observed in diagram of single cell performance with Ni Mo P coated bipolar plate On the contrary for bare 304SS in addition to mentioned regions concentration polarization region was also observed and output voltage and power density of cell were extremely decreased in this region Keywords bipolar plates Ni Mo alloy Ni Mo P alloy electrodeposition polymer electrolyte membrane fuel cell
استاد راهنما :
كيوان رئيسي، مرتضي شمعانيان
استاد داور :
محمد ژياني، فتح الله كريم زاده
