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工艺技术

PMMA表面包覆LaNi5合金粉末的储氢性能

  • 李珂 ,
  • 高云鹤 ,
  • 黄通文 ,
  • 周承商
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  • 中南大学 粉末冶金国家重点实验室,长沙 410083

收稿日期: 2022-04-06

  修回日期: 2022-10-14

  网络出版日期: 2023-01-27

基金资助

国家自然科学基金资助项目(51704336); 中南大学创新驱动计划资助项目(2020CX025)

Hydrogen storage properties of PMMA-coated LaNi5 alloy powders

  • LI Ke ,
  • GAO Yunhe ,
  • HUANG Tongwen ,
  • ZHOU Chengshang
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  • State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2022-04-06

  Revised date: 2022-10-14

  Online published: 2023-01-27

摘要

LaNi5储氢合金粉末易氧化,严重影响其储氢性能。本文采用溶液浸渍法将聚甲基丙烯酸甲酯(poly methyl meth acrylate, PMMA)对LaNi5合金粉末进行表面包覆改性,研究粉末的微观形貌、储氢性能和抗氧化性能。结果表明,空气氧化后,PMMA包覆LaNi5合金的储氢量保持在1.29%(质量分数),而LaNi5合金的储氢量仅为1.15%。对比未包覆的LaNi5合金,PMMA包覆LaNi5合金在空气氧化后仍保持较好的吸放氢动力学性能和储氢量,且具备良好的循环稳定性。因此,PMMA包覆LaNi5合金可减缓合金在空气中的氧化反应,改善合金的抗氧化性能,有利于合金的应用和储氢安全性。

本文引用格式

李珂 , 高云鹤 , 黄通文 , 周承商 . PMMA表面包覆LaNi5合金粉末的储氢性能[J]. 粉末冶金材料科学与工程, 2022 , 27(6) : 595 -600 . DOI: 10.19976/j.cnki.43-1448/TF.2022045

Abstract

LaNi5 hydrogen storage alloy powders are easy to be oxidized, seriously affecting the hydrogen storage properties of LaNi5 alloy. In this paper, PMMA (poly methyl meth acrylate) was used to modify the surface of LaNi5 alloy by the solution impregnation method. The micrmorphology, hydrogen storage properties, and oxidation resistance of LaNi5 alloy were investigated. The results show that the hydrogen storage capacity of air-oxidated PMMA-coated LaNi5 alloy after oxidation is maintained at 1.29%, while that of LaNi5 alloy decreases to 1.15% (mass fraction, %, the same below). Compared with the uncoated LaNi5 alloy, the dehydrogenation and hydrogenation kinetic and hydrogen storage capacity of PMMA-coated LaNi5 alloy after air-exposure are well maintained, and the PMMA-coated LaNi5 alloy possesses good cycling stability. Therefore, PMMA-coated LaNi5 alloy can mitigate the oxidation reaction of the alloy and improve the oxidation resistance of the alloy. It is beneficial for alloy applications and hydrogen storage safety.

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