氢气中存在氧、氮等杂质气组分时,AB5型LaNi4.5Al0.75合金的吸氢速率和储氢容量将出现下降.为提高合金的毒化抗性,在化学镀钯工艺中引进烷基功能化的前处理技术对合金表面进行复合镀覆处理.通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)对合金颗粒表面形貌和结构进行表征;通过容量法测试合金的储氢性能.扫描电镜下,相比纯化学镀样品表面Pd颗粒的球形形貌,复合镀覆γ-Pd-LaNi4.25Al0.75样品表面Pd颗粒为立方体型.测试结果表明,在O2和N2均为0.1％的氢气中,初始压力0.71 MPa、恒温30℃条件下,1％γ-Pd-LaNi425Al0.75样品的特征吸氢速率k和储氢容量Xmax(质量分数)分别达到0.065 s-1和1.152％,较LaNi4.25Al0.75分别提高75.7％和9.2％,较Pd-LaNi4.25Al0.75分别提高30％和3.2％.表明以烷基功能化为前处理的复合镀覆法,能够进一步提升合金表面钯膜对H2分子的催化裂解活性,解决了镀Pd质量分数对催化活性提升的瓶颈,显著提高了LaNi4.25Al0.75合金的抗毒化性能.
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