Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides

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Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides ( enhanced-hydrogen-generation-properties-mgh2-based-hydrides )

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Energies 2015, 8, 4237-4252; doi:10.3390/en8054237 Article Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer Liuzhang Ouyang 1,2, Miaolian Ma 1, Minghong Huang 1, Ruoming Duan 1, Hui Wang 1,2, Lixian Sun 3 and Min Zhu 1,2,* 1 2 3 * Author to whom correspondence should be addressed; E-Mail: memzhu@scut.edu.cn; Tel.: +86-20-8711-3924; Fax: +86-20-8711-2762. Academic Editor: Craig M. Jensen Received: 28 February 2015 / Accepted: 4 May 2015 / Published: 11 May 2015 Abstract: Due to its relatively low cost, high hydrogen yield, and environmentally friendly hydrolysis byproducts, magnesium hydride (MgH2) appears to be an attractive candidate for hydrogen generation. However, the hydrolysis reaction of MgH2 is rapidly inhibited by the formation of a magnesium hydroxide passivation layer. To improve the hydrolysis properties of MgH2-based hydrides we investigated three different approaches: ball milling, synthesis of MgH2-based composites, and tuning of the solution composition. We demonstrate that the formation of a composite system, such as the MgH2/LaH3 composite, through ball milling and in situ synthesis, can improve the hydrolysis properties of MgH2 in pure water. Furthermore, the addition of Ni to the MgH2/LaH3 composite resulted in the synthesis of LaH3/MgH2/Ni composites. The LaH3/MgH2/Ni composites exhibited a higher hydrolysis rate—120 mL/(g·min) of H2 in the first 5 min—than the MgH2/LaH3 composite— 95 mL/(g·min)—without the formation of the magnesium hydroxide passivation layer. Moreover, the yield rate was controlled by manipulation of the particle size via ball milling. School of Materials Science and Engineering and Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, China; E-Mails: meouyang@scut.edu.cn (L.O.); miaolianma@163.com (M.M.); h.minghong@mail.scut.edu.cn (M.H.); meduanrm@gmail.con (R.D.); mehwang@scut.edu.cn (H.W.) China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou 510641, China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, Guilin 541004, China; E-Mail: lxsun@dicp.ac.cn OPEN ACCESS energies ISSN 1996-1073 www.mdpi.com/journal/energies

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