Study on the structure and hydrogen absorption-desorption characteristics of as-cast and annealed La0.78Mg0.22Ni3.48Co0.22Cu0.12 alloys

被引：27

作者：

Huang, Taizhong ^{[1
,2
]}

Han, Jitian ^{[2
]}

Zhang, Yihe ^{[3
,4
]}

Yu, Jiemei ^{[1
,2
]}

Sun, Guoxin ^{[1
]}

Ren, Hao ^{[1
]}

Yuan, Xianxia ^{[5
]}

机构：

[1] Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China

[2] Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Shandong, Peoples R China

[3] Univ Jinan, Shandong Prov Key Lab Fluorine Chem & Chem Mat, Jinan 250022, Shandong, Peoples R China

[4] China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing 100083, Peoples R China

[5] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 22期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Hydrogen storage alloy; Annealing treatment; X-ray diffraction; Pressure composition isotherm; Hysteresis; STORAGE ELECTRODE ALLOY; ELECTROCHEMICAL PROPERTIES; CYCLING STABILITY; TEMPERATURE; CO;

D O I：

10.1016/j.jpowsour.2011.07.038

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

La0.78Mg0.22Ni3.48Co0.22Cu0.12 alloy is one kind of nonstoichiometric AB(3.5) type hydrogen storage alloy with low cost and high capacity. In this paper, the effect of annealing treatment on the structure and hydrogen absorption-desorption characteristics of the alloy is discussed. The annealing temperature is determined by using thermogravimetry-differential scanning calorimetry (TG-DSC) tests. The structure of as-cast and annealed alloys is examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results show that the crystal cell volume decreases after annealing treatment. SEM tests reveal that the structure of the annealed alloys is more regular than that of the as-cast alloy. Influences of annealing treatment on maximum and reversible hydrogen storage capacity, hysteresis factor (H-f) between hydrogen absorption and desorption, sloping factor (S-f), enthalpy changes (Delta H) and entropy changes (Delta S) of hydrogen absorption are discussed in detail. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：9585 / 9589

页数：5

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