| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 98 === LaNix (x = 4.5 ~ 5), La1-yCeyNi4.9 (y = 0.3 ~ 0.7), La0.6Ce0.4Ni4.9-zAlz (z = 0.1 ~ 0.3), La0.6Ce0 .4Ni4.9-zSnz (z = 0.1 ~ 0.3) and La0.6Ce0.4Ni4.9-2zAlzSnz (z = 0.1~ 0.2) alloys were prepared by arc-melting. Composition, microstructure and hydrogen storage properties of alloys were analyzed respectively for studying how Ni, Ce, Al, Sn influence on hydrogen storage properties of LaNi5 alloys. Moreover, the research would like to find out a hydrogen storage alloy which has high level of hydrogen storage capacity and absorption-desorption plateau pressure with low degree of hysteresis. There were downward trend of both absorption-desorption plateau pressure and hydrogen storage capacity of alloys while following the descended of the content of Ni, although, absorption-desorption dynamics and hysteresis of alloy were not affected. The addition of element Ce could substantially improve the absorption- desorption plateau pressure and desorption dynamics of alloy, however, the absorption dynamics, hysteresis and activation of alloys were getting worse. The effect of element Al and Sn were absolutely opposite to element Ce, which could improve absorption dynamics and hysteresis of alloy, but absorption-desorption plateau pressure and desorption dynamics of alloy were getting worse relatively.
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