长周期结构Mg94Cu4Y2储氢合金的吸放氢动力学和组织转变

doi:10.11901/1005.3093.2015.189

材料研究学报

2016, Vol. 30

Issue (4): 248-254 DOI: 10.11901/1005.3093.2015.189

本期目录 | 过刊浏览

长周期结构Mg₉₄Cu₄Y₂储氢合金的吸放氢动力学和组织转变

刘江文, 邹长城, 王辉(

), 欧阳柳章, 曾美琴, 朱敏

华南理工大学材料科学与工程学院广东省先进储能材料重点实验室广州 510640

Enhancing Effect of LPSO Phases on Hydrogen ab- and de-Sorption Kinetics of Mg₉₄Cu₄Y₂ Alloy

LIU Jiangwen, ZOU Changcheng, WANG Hui^**(

), OUYANG Liuzhang, ZENG Meiqin, ZHU Min

Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

引用本文:

刘江文, 邹长城, 王辉, 欧阳柳章, 曾美琴, 朱敏. 长周期结构Mg₉₄Cu₄Y₂储氢合金的吸放氢动力学和组织转变[J]. 材料研究学报, 2016, 30(4): 248-254.
Jiangwen LIU, Changcheng ZOU, Hui WANG, Liuzhang OUYANG, Meiqin ZENG, Min ZHU. Enhancing Effect of LPSO Phases on Hydrogen ab- and de-Sorption Kinetics of Mg₉₄Cu₄Y₂ Alloy[J]. Chinese Journal of Materials Research, 2016, 30(4): 248-254.

全文: PDF(5329 KB) HTML

摘要:

设计并制备含有长周期堆垛有序结构(LPSO)的Mg₉₄Cu₄Y₂储氢合金, 研究了合金在吸放氢过程中组织的转变机制以及吸放氢动力学性能。结果表明, Mg₉₄Cu₄Y₂合金主要由Mg、Mg₂Cu和高度固溶Cu、Y元素的含18R及14H型的LPSO组成。LPSO在首次吸氢过程中分解, 并原位生成均匀的(MgH₂+MgCu₂+YH₃)纳米复合组织。在随后的脱氢和吸放氢循环中, 合金主要通过Mg/MgH₂反应实现吸放氢。细小均匀分布的Mg₂Cu和YH₂对Mg/MgH₂的催化作用, 使该合金表现出较优良的吸放氢动力学特性。

关键词 ：金属材料, 储氢合金, Mg-Cu-Y, 长周期结构, 动力学, TEM

Abstract：

An alloy Mg₉₄Cu₄Y₂ with a large quantity of long-period stacking ordered (LPSO) phases bearing Cu and Y was designed and prepared in this paper. The microstructural transformations and the hydrogen absorption/desorption properties of the alloy were characterized during hydrogenation and dehydrogenation processes. The cast Mg₉₄Cu₄Y₂ alloy consists of phases such as Mg, Mg₂Cu and LPSOs with 18R or 14H type. The LPSOs decomposed at the first hydrogenation, and in situ formed highly even dispersed nanocomposite (MgH₂+MgCu₂+YH₃). The Mg/MgH₂ was the main reaction during the subsequent dehydrogenation cycles. The alloy exhibits excellent hydrogen absorption and desorption kinetics because the nano-sized and even dispersed Mg₂Cu and YH₂catalyzed effectively the Mg/MgH₂ reactions.

Key words： metallic materials hydrogen storage alloy Mg-Cu-Y long period stacking ordered structure kinetics TEM

收稿日期: 2015-04-08

ZTFLH:

TG139

基金资助:* 国家自然科学基金51431001、51271078、 U120124,广东省自然科学基金10151064101000013、2014A030313222、2014A030311004,广东省高等学校珠江学者岗位计划 (2014)和国家国际科技合作专项2015DFA51750资助项目

作者简介: 本文联系人: 王辉, 教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.189 或 https://www.cjmr.org/CN/Y2016/V30/I4/248

图1 铸态Mg94Cu4Y2合金的SEM背散射电子像

图2 Mg94Cu4Y2合金精细结构的TEM照片

图3 Mg94Cu4Y2合金铸态和吸放氢前后的XRD图谱

图4 Mg94Cu4Y2合金放氢状态下的显微组织

图5 Mg94Cu4Y2合金在不同温度下的吸氢动力学曲线

图6 Mg94Cu4Y2合金在不同温度下的放氢动力学曲线

图7 Mg94Cu4Y2合金的吸放氢反应组织转变示意图

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