PEM tipi yakıt hücreleri için Ti destekli Pt-Co katalizörlerinde Co oranının etkisi


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Thesis Type: Postgraduate

Institution Of The Thesis: Gebze Technical University, Instıtute Of Scıence, Physics, Turkey

Approval Date: 2021

Thesis Language: Turkish

Student: SEZGİN FIRAT

Principal Supervisor (For Co-Supervisor Theses): Ali Şems Ahsen

Co-Supervisor: Mehmet Suha Yazıcı

Abstract:

Platinum is still used as a catalyst layer in Proton Exchange Membrane Fuel Cells (PEMFC) although it is one of the most valuable material, which prevents the widespread use of these cells in our daily life (in the military, automotive industry, portable electronic devices). The scientific research showed that heterogeneous bimetallic catalysts (Pt-M) prepared as a nanoscale particles contribute to the effective use of Pt and provides good results in terms of cost and efficiency. For this purpose, Pt-Co bimetallic catalysts with different ratios were prepared under 22 µg/cm2 metal loading by Magnetron Sputtering method operating under ultra-high vacuum (UHV) conditions. The electronic structure and stoichiometry of the prepared ultra-thin catalytic surfaces were determined using X-ray photoelectron spectroscopy (XPS) technique. Electrochemical characterization was performed using cyclic voltammetry (CV) technique and electrochemical active surface area (EASA) was calculated according to CV results. Among the ultra-thin Pt-Co bimetallic catalysts, the highest EASA value per gram of platinum was obtained at the ratio of 104.00 m^2/gPt which corresponds to Pt:Co (1:5) ratio. The results obtained in this study will contribute to the development of more efficient catalyst surfaces by leading the research of bimetallic Pt catalysts prepared for PEM type fuel cells.