Study on reversible hydrogen sorption behaviors of a 3NaBH4/HoF3 composite

被引：13

作者：

Chong, Lina ^{[1
,2
]}

Zou, Jianxin ^{[1
,2
,3
,4
]}

Zeng, Xiaoqin ^{[1
,2
,3
,4
]}

Ding, Wenjiang ^{[1
,2
,3
,4
]}

机构：

[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Shanghai Engn Res Ctr Magnesium Mat & Applicat, Shanghai 200240, Peoples R China

[4] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 26期

基金：

高等学校博士学科点专项科研基金;

关键词：

Reversible hydrogen storage; NaBH4; HoF3; Metal borides; STORAGE MATERIALS; STABILITY; RELEASE;

D O I：

10.1016/j.ijhydene.2014.03.051

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：

In this work, the complex hydrogen sorption behaviors in a 3NaBH(4)/HoF3 composite prepared through mechanical milling were carefully investigated, including the reactions occurred during ball milling and de-/rehydrogenation processes. Different from other rear earth fluorides, the HoF3 can react with NaBH4 during ball milling, leading to the formations of Na-Ho-F and Na-Ho-BH4 complex compounds. The first dehydriding of the 3NaBH(4)/HoF3 composite can be divided into 4 steps, including the ion exchange between H- and F-, the formation of NaHo(BH4)(4), the decomposition of NaHo(BH4)(4) and reaction of NaBH4 with Na-Ho-F compounds. The final products, HoB4, HoH3 and NaF, can be rehydrogenated to generate NaBH4 and NaHoF4 with an absorption capacity of 2.3 wt% obtained at 400 degrees C. Based on the Pressure-Composition-Temperature measurements, the de-/rehydrogenation enthalpies of the 3NaBH(4)/HoF3 composite are determined to be 88.3 kJ mol(-1) H-2 and -27.1 kJ mol(-1) H-2, respectively. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：14275 / 14281

页数：7

共 27 条

[1] A novel high power density borohydride-air cell [J].