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

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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
    China-Australia Joint Laboratory for Energy & Environmental Materials, 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
    China-Australia Joint Laboratory for Energy & Environmental Materials, 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
    China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou 510641, China)

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%.

Suggested Citation

  • Liuzhang Ouyang & Miaolian Ma & Minghong Huang & Ruoming Duan & Hui Wang & Lixian Sun & Min Zhu, 2015. "Enhanced Hydrogen Generation Properties of MgH 2 -Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer," Energies, MDPI, vol. 8(5), pages 1-16, May.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:5:p:4237-4252:d:49396
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    References listed on IDEAS

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    Cited by:

    1. Huaiyu Shao, 2017. "Heat Modeling and Material Development of Mg-Based Nanomaterials Combined with Solid Oxide Fuel Cell for Stationary Energy Storage," Energies, MDPI, vol. 10(11), pages 1-11, November.
    2. Craig M. Jensen & Etsuo Akiba & Hai-Wen Li, 2016. "Hydrides: Fundamentals and Applications," Energies, MDPI, vol. 9(4), pages 1-2, April.
    3. Ma, Miaolian & Yang, Lingli & Ouyang, Liuzhang & Shao, Huaiyu & Zhu, Min, 2019. "Promoting hydrogen generation from the hydrolysis of Mg-Graphite composites by plasma-assisted milling," Energy, Elsevier, vol. 167(C), pages 1205-1211.
    4. Öz, Çisem & Coşkuner Filiz, Bilge & Kantürk Figen, Aysel, 2017. "The effect of vinegar–acetic acid solution on the hydrogen generation performance of mechanochemically modified Magnesium (Mg) granules," Energy, Elsevier, vol. 127(C), pages 328-334.

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