高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (10): 1776.doi: 10.7503/cjcu20160284

• 研究论文: 无机化学 • 上一篇    下一篇

Mg2Ni1-xCox合金相的固溶烧结法制备及结构和储氢性能

马勇, 李祥志, 李永涛, 柳东明, 张庆安, 斯庭智()   

  1. 安徽工业大学材料科学与工程学院, 马鞍山 243002
  • 收稿日期:2016-04-25 出版日期:2016-10-10 发布日期:2016-09-23
  • 作者简介:联系人简介: 斯庭智, 男, 博士, 教授, 主要从事储氢材料研究. E-mail:tzsiahut@163.com
  • 基金资助:
    国家自然科学基金(批准号: U1503192)资助

Phase Structures and Hydrogen Storage Properties of Mg2Ni1-xCox Alloys Prepared by Solid Solution Sintering

MA Yong, LI Xiangzhi, LI Yongtao, LIU Dongming, ZHANG Qing’an, SI Tingzhi*()   

  1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China
  • Received:2016-04-25 Online:2016-10-10 Published:2016-09-23
  • Contact: SI Tingzhi E-mail:tzsiahut@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.U1503192)

摘要:

采用固溶烧结法制备了Mg2Ni1-xCox (x=0.10, 0.15, 0.20)合金, 利用X射线衍射仪和压力-组成-温度测试仪等研究了Co含量对合金相结构和储氢性能的影响. 结果表明, 合金由Mg2Ni型Mg2(Ni, Co)主相及少量Mg和MgNi3Co新相组成. Mg2(Ni, Co)具有良好的可逆储氢性能, 吸氢形成Mg2Ni0.9Co0.1H4型四元氢化物, 其具有与父系氢化物HT-Mg2NiH4相近的放氢焓变(ΔHd=63.9 kJ/mol H2). Mg2Ni1-xCox (x=0.10, 0.15, 0.20)合金具有良好的放氢动力学性能, 二维相界面迁移为放氢过程的控制步骤. 随着Co含量的增加, 合金的放氢活化能(Ea)降低, 其中, Mg2Ni0.8Co0.2Ea降低到54.0 kJ/mol.

关键词: Mg2Ni型合金, Co合金化, 固溶烧结, Mg2Ni0.9Co0.1H4, 储氢性能

Abstract:

Mg2Ni1-xCox (x=0.10, 0.15, 0.20) alloys were prepared by a novel method combining solid solution with sintering process. The effect of Co content on the phase structures and hydrogen storage properties were investigated by XRD and pressure-composition-temperature analyser. It was found that the alloys consisted of a Mg2Ni-type major phase Mg2(Ni, Co), minor Mg and a new phase MgNi3Co. The Mg2(Ni, Co) compounds displayed a reversible hydrogen storage process. After hydrogenation, the quaternary Mg2Ni0.9Co0.1H4-type hydride was formed with an enthalpy change of the hydrogen desorption(ΔHd=63.9 kJ/mol H2) approximate to the parent hydride HT-Mg2NiH4. The Mg2Ni1-xCox(x=0.10, 0.15, 0.20) alloys showed a superior desorption kinetics and the desorption process was mainly controlled by two-dimensional phase-boundary migration. For the Mg2Ni1-xCox (x=0.10, 0.15, 0.20) alloys, the activation energy of hydrogen desorption (Ea) decreased with the increase of Co content. As a result, the Ea value of the Mg2Ni0.8Co0.2 alloy was significantly lowered to 54.0 kJ/mol.

Key words: Mg2Ni-type alloy, Co-alloying, Solid solution sintering, Mg2Ni0.9Co0.1H4, Hydrogen storage property

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