Nanocomposite fuel cells

Benli, Ahmet Deniz (2019) Nanocomposite fuel cells. [Thesis]

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The interactions between the components of the nanocomposite fuel cell electrolyte were investigated. Surface charges were thought to be responsible for the differences in the ionic conductivity. The literature claims that ionic transport in hybrid electrolytes does not happen primarily in the solid oxide or the matrix phase but at the interface between them. The surface charges of oxide particles are dissociating the matrix salt molecules into positive and negative ion complexes. The complex with the opposite charge sticks to the surface of the particles. The counter-ion moves freely under the influence of the electrical field, thus causing fast ionic current. Therefore, it is postulated that by modifying the surface charges one can affect the ionic conductivity. The strength of surface acidity was manipulated by reduction without significantly changing the chemistry of the oxide material. TiO2 (Rutile) was selected as the material whose surface charge was altered by reduction. Ionic conductivities were measured by impedance spectrometry. Surface charges were obtained by isoelectric point measurements. The amounts of reduction were measured by thermogravimetric analysis. Oxides with different surface charges resulted in different ionic conductivities. Substoichiometric oxides had different strength of surface charges that resulted in correlated ionic conductivities. These interactions of surface charges and the ionic conductivities are explained with the help of a developed model for the composite electrolyte.
Item Type: Thesis
Uncontrolled Keywords: Nanocomposite electrolyte. -- Ionic conductivity. -- Surface charge. -- Fuel cell. -- Nanokompozit elektrolit. -- İyonik iletkenlik. -- Yüzey yükü. -- Yakıt hücresi.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: IC-Cataloging
Date Deposited: 21 Feb 2019 11:41
Last Modified: 26 Apr 2022 10:29

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