Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Gebze Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Physics, Türkiye
Tezin Onay Tarihi: 2021
Tezin Dili: Türkçe
Öğrenci: SEZGİN FIRAT
Asıl Danışman (Eş Danışmanlı Tezler İçin): Ali Şems Ahsen
Eş Danışman: Mehmet Suha Yazıcı
Özet:
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.