表面Pd膜对LaNi4.25Al0.75合金贮氢性能的影响

刘丽飞, 肇博涛, 张平柱, 叶一鸣, 胡石林

中国表面工程 ›› 2015, Vol. 28 ›› Issue (3) : 56-62.

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中国表面工程 ›› 2015, Vol. 28 ›› Issue (3) : 56-62. DOI: 10.11933/j.issn.1007-9289.2015.03.009
表面工程

表面Pd膜对LaNi4.25Al0.75合金贮氢性能的影响

  • 刘丽飞, 肇博涛, 张平柱, 叶一鸣, 胡石林
作者信息 +

Influences of Surface Palladium Film on Hydrogen Storage Performance of LaNi4.25Al0.75 Alloy

  • LIU Lifei, ZHAO Botao, ZHANG Pingzhu, YE Yiming, HU Shilin
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摘要

为改善LaNi4.25Al0.75贮氢合金表面抵抗杂质气体毒化的能力,采用化学镀对粒径d为150~300 μm的LaNi4.25Al0.75颗粒进行了表面金属Pd的包覆。通过扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)对化学镀前后LaNi4.25Al0.75合金颗粒的表面形貌及结构进行表征分析;采用容量法测试材料的贮氢性能。结果表明:化学镀在LaNi4.25Al0.75颗粒表面沉积了一层晶体Pd单质,膜层均匀且有一定的致密性。表面金属Pd层能够使LaNi4.25Al0.75颗粒在含杂质(O2和N2)氢气中的贮氢容量的衰减幅度由1.928%降至0.086%,有效提升了其抵抗O2和N2毒化的能力。

Abstract

The LaNi4.25Al0.75 alloy particle of the size of 150~300 μm was coated with palladium via electroless plating process to improve its durability against surface poisoning by impurity gases. Surface morphologies and structure of LaNi4.25Al0.75 particles before and after electroless plating were characterized and analyzed by SEM, EDX and XRD,and the hydrogen storage properties were tested by the volumetric method. It is found that a uniform elemental Pd film of crystalline structure and certain compactness is introduced by electroless plating on the surface of LaNi4.25Al0.75 particles. The surface palladium layer is able to decrease the amplitude attenuation of hydrogen storage capacity of LaNi4.25Al0.75 particles in hydrogen with O2 and N2 impurities from 1.928% to 0.086%, and thus effectively improve its resistance against O2 and N2 impurities.

关键词

LaNi4.25Al0.75合金; 贮氢性能; 化学镀; Pd

Key words

LaNi4.25Al0.75 alloy; hydrogen storage property; electroless plating; palladium (Pd)

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刘丽飞, 肇博涛, 张平柱, 叶一鸣, 胡石林. 表面Pd膜对LaNi4.25Al0.75合金贮氢性能的影响[J]. 中国表面工程, 2015, 28(3): 56-62 https://doi.org/10.11933/j.issn.1007-9289.2015.03.009
LIU Lifei, ZHAO Botao, ZHANG Pingzhu, YE Yiming, HU Shilin. Influences of Surface Palladium Film on Hydrogen Storage Performance of LaNi4.25Al0.75 Alloy[J]. China Surface Engineering, 2015, 28(3): 56-62 https://doi.org/10.11933/j.issn.1007-9289.2015.03.009
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