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Microstructure evolution and controlled hydrolytic hydrogen generation strategy of Mg-rich Mg-Ni-La ternary alloys

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  • Hou, Xiaojiang
  • Wang, Yi
  • Yang, Yanling
  • Hu, Rui
  • Yang, Guang
  • Feng, Lei
  • Suo, Guoquan

Abstract

As-cast (Mg-10Ni)1-x-Lax (x = 0, 5, 10, 15 wt%) ternary Mg-rich alloys with different La contents are successfully prepared by the flux protection melting method. The mechanism of hydrolysis hydrogen generation is investigated in combination with the phase compositions, microstructures, electrochemical properties and hydrolysis hydrogen generation properties. The results show that with the increase of La, the electrochemical activity increase, while the eutectic microstructure decreases. When adding 10 wt% and 15 wt% La, the Mg17La2 active intermediate phase is observed. In corrosive weak acid medium, the (Mg-10Ni)90La10 (10La) alloy presents the best hydrogen generation performance, while in the neutral distilled water medium, the (Mg-10Ni)85La15 (15La) alloy performs well. The initial hydrolysis reaction kinetics of Mg-Ni-La alloys in distilled water is mainly controlled by the electrochemical activity of the alloy. While, it is mainly determined by the mass transfer channels formed in the microstructures when in weak acid medium. The mechanism of hydrolysis hydrogen generation and the controlled hydrolytic hydrogen generation strategy of Mg-Ni-La alloys proposed in this work provide possible technical guidance to prepare Mg-based hydrogen generation alloys with high reaction activity, high hydrogen generation yield and controlled hydrolysis kinetics.

Suggested Citation

  • Hou, Xiaojiang & Wang, Yi & Yang, Yanling & Hu, Rui & Yang, Guang & Feng, Lei & Suo, Guoquan, 2019. "Microstructure evolution and controlled hydrolytic hydrogen generation strategy of Mg-rich Mg-Ni-La ternary alloys," Energy, Elsevier, vol. 188(C).
    • Handle: RePEc:eee:energy:v:188:y:2019:i:c:s0360544219317761
    DOI: 10.1016/j.energy.2019.116081
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    References listed on IDEAS

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    2. Zhang, J. & Yao, Y. & He, L. & Zhou, X.J. & Yu, L.P. & Lu, X.Z. & Peng, P., 2021. "Hydrogen storage properties and mechanisms of as-cast, homogenized and ECAP processed Mg98.5Y1Zn0.5 alloys containing LPSO phase," Energy, Elsevier, vol. 217(C).
    3. Qureshi, Fazil & Yusuf, Mohammad & Kamyab, Hesam & Vo, Dai-Viet N. & Chelliapan, Shreeshivadasan & Joo, Sang-Woo & Vasseghian, Yasser, 2022. "Latest eco-friendly avenues on hydrogen production towards a circular bioeconomy: Currents challenges, innovative insights, and future perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).

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