(四川大學金屬材料系，成都610065)
摘 要: 研究了貯氫合金LaNi4.7Al0.3和MlNi4.5Al0.5在純氫(99.999%)及氫中含CO氣體雜質(zhì)條件下的p-c-t 特性及循環(huán)性能。結(jié)果表明，合金經(jīng)CO毒化后，平臺壓升高，平臺傾斜加劇，平臺寬度縮小，飽和吸氫量減小。毒化后兩種貯氫合金的循環(huán)性能衰退，而且隨著循環(huán)次數(shù)的增加吸氫量減少，增加CO的濃度，吸氫量減少更加明顯。合金貯氫性能下降的原因可能是由于表面生成了氧化物及新相，阻止了氫的吸附與擴散。
關鍵字: 一氧化碳；貯氫合金；毒化
（Department of Metal Materials and Engineering, Sichuan University, Chengdu 610065, P.R.China）
Abstract:The p-c-t degradation behaviours and cycling hydriding of LaNi4.7Al0.3 and MlNi4.5Al0.5 alloys were investigated by measuring the difference between pure hydrogen and hydrogen containing CO. The plateaus of LaNi4.7Al0.3 and MlNi4.5Al0.5 alloys were both lifted and inclined, the width of p-c-t curve was shorted, the absorbed hydrogen content was reduced drastically after poisoning. The amount of hydrogen absorbed was decreased continuously as the number of cycles was increased under same concentration of CO. The higher of the concentration of CO, the lower of the cycling properties. The reasons of poison was analyzed through XPS and XRD.
Key words: carbon monoxide; hydrogen storage alloys; poisoning
