Bu çalıĢma kapsamında NaBH4 indirgenme yöntemi ile PdCo/CNT, PdMn/CNT,
PdZn/CNT, PdV/CNT katalizörler hazırlandı. Katalizörlerin fiziksel karakterizasyonları XRD, TEM ve XPS yöntemleri ile elektrokimyasal karakterizasyonları ise metanol, etanol ve etilen glikol elektrooksidasyon reaksiyonları için dönüĢümlü voltametri, kronoamperometri ve elektrokimyasal impedans yöntemleri ile incelendi. Ayrıca en yüksek katalitik aktiviteye sahip PdCo/CNT katalizörü ile potansiyel tarama hızı ve alkol deriĢimi gibi deneysel parametrelerin metanol, etanol ve etilen glikol elektrooksitlenmesi için etkileri incelenmiĢtir. Potansiyel tarama hızının alkol elektrooksidasyon reaksiyonuna etkisi incelendiğinde, potansiyel tarama hızının artıĢı ile ileri ve geri yöndeki pik akımlarının arttığı ve tarama hızlarının kareköküne karĢı pik akımı grafiklerinin doğrusal olduğu gözlenmiĢtir. Bu sonuç, PdCo/CNT modifiye GCE de alkol oksidasyonlarının difüzyon kontrollü olduğunu göstermektedir. Ayrıca alkol deriĢiminin artması ile ileri yöndeki anodik pik akımının belirli deriĢime kadar arttığı ve pik potansiyelinde pozitif yönde kaymaların olduğu gözlenmiĢtir. Ayrıca farklı alkol ortamlarında yapılan kronoamperometrik çalıĢmalar sonucunda PdCo/CNT modifiye GCE‟nin kararlılığının en yüksek olduğu bulunmuĢtur. En son olarak alkol elektrooksidasyon kinetiğinin incelenmesi amacıyla yapılan elektrokimyasal impedans spektroskopisi çalıĢmaları sonucu elde edilen Nyquist eğrileri incelendiğinde yarım daire çapının PdCo/CNT modifiye GCE için en düĢük olduğu bulunmuĢtur. Bu sonuç göstermektedir ki alkol elektrooksidasyon reaksiyonu PdCo/CNT modifiye GCE ile daha hızlı ve kolay gerçekleĢmektedir.
Sonuç olarak PdCo/CNT katalizörünün yüksek katalitik aktiviteye ve kararlılığa sahip olduğu ve zehirlenme toleransının iyi olduğu bulunmuĢtur.
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ÖZGEÇMĠġ
KĠġĠSEL BĠLGĠLER
Adı Soyadı : Ebru ÖZKAN
Uyruğu : T.C.
Doğum Yeri ve Tarihi : Bağcılar/ 25.06.1993
e-mail : ebruozkan93@hotmail.com.tr EĞĠTĠM
Derece Adı, Ġlçe, Ġl Bitirme Yılı
Lise : Bağcılar Lisesi 2011
Üniversite : Selçuk Üniversitesi 2015
Yüksek Lisans : Selçuk Üniversitesi YABANCI DĠLLER
Ġngilizce
BELĠRTMEK ĠSTEĞĠNĠZ DĠĞER ÖZELLĠKLER
YAYINLAR
Özlem ġahin, Ebru Özkan, Orhan Alal, Hilal Kıvrak, Gülnare Ahmetli, “Pd Based Catalysts For Fuel Cell Aplications”, 3rd International Conference on Advanced Technology & Sciences (ICAT-16), (1-3.09.2016).
Hilal Demir Kıvrak, Özlem Sahin, Ebru Özkan, “Pd based Catalysts for Electrochemical Detection of H2O2. III International Conference on Engineering
and Natural Sciences, Budapest, Hungary, May 3-7, 2017.
Hilal Demir Kivrak, Ebru Ozkan, Burak Yapıcı, Sumeyye Dogan, Shekiba Muhammady, Ozlem Sahin “Bimetallic Particles for Ethanol Electro-oxidation”, 3rd International Hydrogen Technologies Congress, Alanya, Turkey, 15-18 March, 2018.
Özlem ġahin, Ebru Özkan, Rabia Esra Takır, Abdullah Nadeesh, Hilal Demir Kıvrak “Electrocatalytic Performance of Pd Based Bimetallic Catalysts for Methanol Oxidation Reaction” 3rd International Hydrogen Technologies Congress, Alanya, Turkey, 15-18 March, 2018.
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Ozlem Sahin, Ebru Ozkan, Hilal Demir Kivrak, “Comparison of Alcohol Electro-oxidation in Alkaline Medium” 3rd International Hydrogen Technologies Congress, Alanya, Turkey, 15-18 March, 2018.
Berdan Ulas, Özlem Sahin, Hilal Demir Kıvrak, Ebru Özkan (2016). Electrocatalytic oxidation of ethylene glycol at MPd( M: Mn, Zn) core Shell and alloy bimetallic catalysts. 3rd International Nanoscience and Nanotechnolgy for Next Generation Conference, Antalya, Turkey, October 20-22, 2016.