Enhanced Hydrogen Generation Properties of MgH 2 -Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer

Liuzhang Ouyang, Miaolian Ma, Minghong Huang, Ruoming Duan, Hui Wang, Lixian Sun and Min Zhu
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Liuzhang Ouyang: 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
Miaolian Ma: 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
Minghong Huang: 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
Ruoming Duan: 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
Hui Wang: 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
Lixian Sun: Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, Guilin 541004, China
Min Zhu: 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

Energies, 2015, vol. 8, issue 5, 1-16

Abstract: Due to its relatively low cost, high hydrogen yield, and environmentally friendly hydrolysis byproducts, magnesium hydride (MgH 2 ) appears to be an attractive candidate for hydrogen generation. However, the hydrolysis reaction of MgH 2 is rapidly inhibited by the formation of a magnesium hydroxide passivation layer. To improve the hydrolysis properties of MgH 2 -based hydrides we investigated three different approaches: ball milling, synthesis of MgH 2 -based composites, and tuning of the solution composition. We demonstrate that the formation of a composite system, such as the MgH 2 /LaH 3 composite, through ball milling and in situ synthesis, can improve the hydrolysis properties of MgH 2 in pure water. Furthermore, the addition of Ni to the MgH 2 /LaH 3 composite resulted in the synthesis of LaH 3 /MgH 2 /Ni composites. The LaH 3 /MgH 2 /Ni composites exhibited a higher hydrolysis rate—120 mL/(g·min) of H 2 in the first 5 min—than the MgH 2 /LaH 3 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. The hydrolysis of MgH 2 was also improved by optimizing the solution. The MgH 2 produced 1711.2 mL/g of H 2 in 10 min at 298 K in the 27.1% ammonium chloride solution, and the hydrolytic conversion rate reached the value of 99.5%.

Keywords: MgH 2 -based hydride; hydrolysis; hydrogen generation; composites (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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