Hydrogen production via hydrolysis reaction from ball-milled Mg-based materials
Hydrogen production via hydrolysis reaction from ball-milled Mg-based materials
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DOI：
10.1016/j.ijhydene.2005.01.001
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发表时间：
2006-01-01
影响因子：
7.2
通讯作者：
Huot, JY
中科院分区：
文献类型：
--
作者：
Grosjean, MH;Zidoune, M;Huot, JY
研究了Mg和MgH_2在纯水和1 MKCl中的水解制氢反应。结果表明，高能球磨得到的Mg和Mg-Ni复合材料在1 MKCl中的水解反应速度快，反应范围广。相比之下，在纯水中研磨的Mg和Mg-Ni复合物、在纯水和IM KCl中的MgH 2和MgH 2-Ni复合物显示出低的产率和反应性。水解动力学和产率在Mg-10 at% Ni复合物研磨30 min时最大，因此在氯离子存在下反应在1小时内完全完成。这与Mg和分散的Ni元素之间产生微原电池有关，大大加剧了Mg在高导电性水介质中的腐蚀。用30分钟研磨的Mg样品也观察到H-2产量的显著增加，这可能是因为通过研磨过程产生许多缺陷和新表面导致的点蚀加重。另一方面，纯镁的强烈球磨对镁在纯水中的反应性没有影响。球磨效应可能被纯水中的显著Mg钝化所掩盖。在纯水中球磨MgH 2粉末的转化率与其有效表面积之间建立了相关性，该表面积通过球磨过程而增加。Ni的添加对在非导电介质（即纯水）中和与非导电材料（即MgH 2）的水解反应没有影响。(c)2005年国际氢能协会。由爱思唯尔有限公司出版。保留所有权利。
Hydrogen generation by hydrolysis of Mg and MgH2 has been investigated in pure water and 1M KCl It has been found that hydrolysis reaction of Mg and Mg-Ni composite, both obtained by high-energy ball milling, is faster and extensive when they are immersed in 1 M KCl. In contrast, milled Mg and Mg-Ni composite in pure water, MgH2 and MgH2-Ni composites in pure water and in 1M KCl show low yield and reactivity. Hydrolysis kinetics and yield are maximum with Mg-10 at% Ni composite milled for 30 min, so reaction is fully completed within an hour in the presence of chloride ions. It is related to the creation of micro-galvanic cells between Mg and dispersed Ni elements, accentuating greatly Mg corrosion in highly conductive aqueous media. A significant increase of the H-2 production is also observed with 30 min milled Mg sample, likely because of the accentuation in the pitting corrosion resulting from the creation of numerous defects and fresh surfaces through the milling process. On the other hand, intensive ball milling of pure magnesium has no effect on the Mg reactivity in pure water. Ball milling effect is likely masked by the significant Mg passivation in pure water. A correlation is established between the conversion yield of ball-milled MgH2 powder in pure water and its effective surface area, which is increased by the milling process. Ni addition has no effect on the hydrolysis reaction in nonconductive media (i.e. pure water) and with nonconductive material (i.e. MgH2). (c) 2005 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.