Indium Oxide/Yttria-Stabilized Zirconia Composite Films as Electrolytes for Solid Oxide Fuel Cells
| Autor: | Yi-Jun Huang, 黃奕鈞 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 To the best of our knowledge, there are two methods to increase ionic conductivity of solid oxide fuel cells ( SOFCs ) electrolyte. One is the decrease in the thickness of electrolyte and the other is the electrolyte is doped by foreign materials. In this work, indium oxide (In2O3) is doped into electrolyte to improve the ionic conductivity of electrolyte. Yttria-stabilized zirconia(YSZ) and indium hydroxide (In(OH)3) are synthesized by hydrothermal method. The YSZ powder is about 90 nm. Various In(OH)3 morphology can be controlled by different concentration of InCl3. In2O3 is obtained after the calcination of In(OH)3 at 500℃. The In2O3/YSZ film is obtained by doping different In2O3 structures into YSZ films. The electrolyte of doped various In2O3 structures, nanoparticle (NP), nano/micro cube (NMC), micro cube (MC) are discussed at first, so the ratio of doped In2O3 is fixed at XIn2O3=0.06, about 12.7 w%. In2O3 NP /YSZ films have better ionic conductivity than In2O3 MC/YSZ films and In2O3 NMC /YSZ at 900℃. Then ratio of doped In2O3 are changed to find better ionic conductivity and In2O3 structures is fixed In2O3 NP to dope into films. The value of ratio are XIn2O3=0.01, about 2.3w%、XIn2O3=0.005, about 1.1w%、XIn2O3=0.001, about 0.2w%. In2O3 NP /YSZ films with XIn2O3=0.005 have better ionic conductivity (0.084Ω-1 cm-1)than other ratio at 900℃. In reference, ZnO and MgO have been doped into YSZ, their values are 0.029 and 0.035Ω-1 cm-1 at 800℃. In2O3/YSZ films with XIn2O3=0.005 are their values 1.7 times and 1.4 times. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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