合金元素(Ce,Al,Sn)添加對LaNix儲氫合金 吸放氫特性之影響 ; Effect of Ce, Al and Sn addition on the hydrogen storage properties of LaNix alloys

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Title:	合金元素(Ce,Al,Sn)添加對LaNix儲氫合金吸放氫特性之影響;Effect of Ce, Al and Sn addition on the hydrogen storage properties of LaNix alloys
Authors:	陳鏡超;Kang-Chiu Chan
Contributors:	能源工程研究所
Keywords:	PCI;儲氫合金;LaNi5;XRD;LaNi5;XRD;Hydrogen storage alloy;PCI
Date:	2010-07-22
Issue Date:	2010-12-08 13:40:39 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究利用電弧熔煉法備製出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)及La0.6Ce0.4Ni4.9-2zAlzSnz (z=0.1~0.2)合金，分別對其結構成份、微結構與儲氫特性進行分析，研究元素Ni、Ce、Al、Sn對LaNi5合金儲氫特性之影響，並期望找出高儲氫量、高吸放氫平台壓及低遲滯的儲氫合金。研究後發現隨著合金中Ni含量減少，合金吸放氫平台壓與儲氫量均有減少趨勢，至於其吸放氫動力及遲滯則無任何影響。添加Ce元素能大幅改善合金吸放氫平台壓及放氫動力，但合金吸氫動力、遲滯及活化能力變差。至於Al元素及Sn元素對合金之影響則與Ce元素完全相反，能改善合金的吸氫動力及遲滯，而合金的吸放氫平台壓及放氫動力則相對變差。 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.
Appears in Collections:	[Energy of Mechatronics] Electronic Thesis & Dissertation

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