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" Enerji uygulamaları için çoklu metal oksit foto-elektrotların geliştirilmesi "
Özkahraman, Ecem Ezgi
Karabudak, Engin
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1058986
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| Doc. No
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TL58103
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| Main Entry
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Özkahraman, Ecem Ezgi
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| Title & Author
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Enerji uygulamaları için çoklu metal oksit foto-elektrotların geliştirilmesi\ Özkahraman, Ecem EzgiKarabudak, Engin
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| College
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Izmir Institute of Technology (Turkey)
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| Date
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2020
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| Degree
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Master's
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| student score
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2020
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| Note
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94 p.
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| Abstract
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Water splitting via artificial photosynthesis uses only sunlight and water to produce hydrogen and oxygen. Hydrogen can be used as a green energy source. To be able this reaction to occur there is a catalyst needed as reaction center. Platinum and Iridium are the state-of-art catalyst used for water splitting reactions. The goal of this study is to develop an earth abundant, highly stable and efficient catalyst as an alternative to noble metal catalysts. For this purpose, ABO3 type perovskites was chosen to study for their abundancy and proven electrochemical efficiencies. BSCF was chosen as the starting point of this study because it is known for its great catalytic activity compared to state-of-art catalysts such as Iridium Oxide. To enhance the stability and catalytic activity of synthesized perovskite oxides, several foreign atoms (dopants) were introduced to their structure from B-site. Each perovskite was synthesized by the EDTA-Citrate complexing Sol-Gel method. Also, for dopants, cost-efficient and electron conductive elements was chosen in each study. As HER catalysts, manganese, zinc, and copper were introduced to BSCF structure as dopant, while for OER, silver was used as a dopant. In this study, catalytic activities and stabilities were tested by electrochemical methods. All electrochemical measurements were performed in alkaline media by three-electrode configurations. Perovskite oxides were prepared by the coating of their inks on Ni foam substrates by drop coating for HER and OER activity measurements by electrochemical methods. For the bulk and surface characterization of synthesized perovskite oxide powders, SEM, XRD, XPS, and BET analysis was performed.
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| Descriptor
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Alternative energy sources
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Chemistry
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Investigations
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Photovoltaic cells
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Semiconductors
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Spectrum analysis
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| Added Entry
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Karabudak, Engin
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Izmir Institute of Technology (Turkey)
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