Synthesis, structures and dehydrogenation of magnesium borohydride-ethylenediamine composites

被引：26

作者：

Chen, Juner ^{[1
,2
]}

Chua, Yong Shen ^{[1
]}

Wu, Hui ^{[3
,4
]}

Xiong, Zhitao ^{[1
]}

He, Teng ^{[1
]}

Zhou, Wei ^{[4
]}

Ju, Xiaohua ^{[1
]}

Yang, Minghui ^{[1
]}

Wu, Guotao ^{[1
]}

Chen, Ping ^{[1
,5
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2015年 / 40卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Dehydrogenation; Magnesium borohydride; Ethylenediamine; Hydrogen storage; Mechanism; Isotopic labelling; HYDROGEN-STORAGE; MG(BH4)(2); RELEASE; SYSTEM; BORANE;

D O I：

10.1016/j.ijhydene.2014.11.020

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：

Magnesium borohydride-ethylenediamine composites (Mg(BH4)(2)-nEDA, n = 2, 3, 4), a new type of hydrogen storage material, were synthesized by ball milling magnesium borohydride and ethylenediamine (EDA). In particular, Mg(BH4)(2).3EDA and Mg(BH4)(2).4EDA can be well defined by a orthorhombic Pbca cell and a triclinic P1 cell, respectively. Hydrogen releasing from the Mg(BH4)(2)-nEDA composites was observed at elevated temperatures. Detailed dehydrogenation properties and mechanism of Mg(BH4)(2)-2EDA composite in which there are equivalent H delta+(N) and H delta-(B) were systematically investigated. Ca. 8 wt% hydrogen can be evolved from Mg(BH4)(2)-2EDA in one step upon holding it at 260 degrees C for 12 h. Mechanistic studies using phased dehydrogenation and isotopic labelling experiments show that hydrogen was released via the establishment of -N=B=N- bond as well as the combination of H delta+ (N) and H delta- (B). Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：412 / 419

页数：8

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