پديد آورنده :
طلائي زواره، زهرا
عنوان :
ساخت و مطالعه خواص ساختاري و الكتروشيميايي كاتدهاي برپايه ي باريوم ﴿پيل سوختي اكسيد جامد﴾
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
نه، 83، [II]ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
هادي سلامتي
استاد مشاور :
پرويز كاملي
توصيفگر ها :
عصر هيدروژن , واكنش الكتروشيميايي , پلارونهاي كوچك
تاريخ نمايه سازي :
01/4/87
استاد داور :
محسن ذهبي، مهين اشراقي
تاريخ ورود اطلاعات :
1396/03/08
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractA fuel cell is an electrochemical device that converts the chemical energy of a fueldirectly into electrical energy All fuel cells consist of two electrodes anode and cathode and an electrolyte They operate much like a battery except that the reactants andproducts are not stored but continuously fed to the cell Fuel is fed to the anode negative electrode and an oxidant is fed to the cathode positive electrode Electrochemical oxidation and reduction reactions take place at the electrodes to produceelectric current The primary product of fuel cell reactions is water In general electrolyteand operating temperature differentiates the various fuel cells SOFCs employ a solidstate electrolyte and operate at the highest temperature 800 1000 C of all fuel cell types During operation oxidant usually air enters the cathode compartment and after thereaction happened in cathode oxygen ions migrate through the electrolyte layer to theanode where hydrogen is oxidized The operating temperature of SOFCs is sufficientlyhigh to provide the necessary heat for the endothermic reforming reaction SOFCs therefore are more tolerant of fuel impurities and can operate using hydrogen and carbonmonoxide fuels directly at the anode They don t require costly external reformers orcatalysts to produce hydrogen In this study Ba0 5Sr0 5Co0 8Fe0 2O3 BSCF oxide wasprepared using a solid state reaction method This composition was investigated as acathode of fuel cell Crystal structure and electrochemical conductivity were studied byx ray diffraction and four point DC respectively The x ray pattern shows cubicstructure The resistivity was measured from room temperature up to 400 C At thistemperature range resistivity was dropped 99 percent of its original value In theinvestigation of the electrochemical properties Dchem chemical diffusion coefficient andEa activation energy for hopping of small polarons were calculated Hopping of smallpolarons can attribute to conductivity mechanism The results demonstrated that byincreasing temperature the value of Dchem is enhanced Relation between LogDchem andtemperature inverse is linear with negative slope
استاد راهنما :
هادي سلامتي
استاد مشاور :
پرويز كاملي
استاد داور :
محسن ذهبي، مهين اشراقي
