The development of solid electrolyte in bismuth-oxide-containing fuel cell

• Main Authors: Yung-Zen Wang, 王揚仁
• Other Authors: Tzer-Shin Sheu
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/39213469440103414681

碩士 === 義守大學 === 材料科學與工程學系 === 89 === Abstract For observation of phase stability ofδ－Bi2O3, binary oxide dopant system was selected to replace single oxide dopant system. In this binary oxide dopant system, In2O3 and one of rare earth metal oxides or Y2O3 were mixed. Through alloying design, effective cation radius were calculated, and its effect to phase stability was dicussed in detail. Powders for this ternary oxide system were obtained from coprecipitation method. The relationships among coprecipitation , caliuation temperature, sintering temperature and composition were observed and discussed, respectively. During coprecipitation, PH value of solution was set at 12. From calculation, the remaining cation content in the solution is below 1*10-6M approxicuately. It indicated that the composition of these ternary oxide was the same as the designed value. Most of coprecipitated powders had calcinations temperature down to 540℃. Sintering temperature for these ternary oxide system was ranged from 730℃ to 920℃. Sintering temperature was increasing with the increasing amount of oxide dopant. In these ternary oxide system, the different combinations of oxide dopants were observed to affect the phase existence of δ－Bi2O3. In the systems Bi2O3- In2O3 - Gd2O3, Bi2O3- In2O3 - Y2O3 and Bi2O3- In2O3 - Yb2O3, δ－Bi2O3, was stabilized with the increasing amount of oxide dopants. However, in the Bi2O3- In2O3 - Nd2O3, the increasing amount of oxide dopant was favor to form γ－Bi2O3