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Microstructure and enhanced gaseous hydrogen storage behavior of CoS2-catalyzed Sm5Mg41 alloy

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  • Yuan, Zeming
  • Zhang, Yanghuan
  • Yang, Tai
  • Bu, Wengang
  • Guo, Shihai
  • Zhao, Dongliang

Abstract

The effects of catalyst CoS2 on the microstructure and gaseous hydrogen storage behaviors of Sm5Mg41 + x wt% CoS2 (x = 0, 5, 10) alloys prepared by milling CoS2 nanoparticles and the as-cast Sm5Mg41 alloy have been investigated. The alloys before hydrogenation are composed of Sm5Mg41 and SmMg3 phases; ball milling refines the crystal grain. The Sm3H7 and MgH2 phases appear after hydrogenation, furthermore, the Mg phase is formed and the Sm3H7 phase is retained after dehydrogenation. The CoS2 phase always exists in the form of nanoparticles embedded into the surface of the catalyzed alloy, which mainly presents a nanostructure containing some crystal defects, such as dislocations, grain boundaries and twins. These microstructures play a beneficial role in reducing the total potential barrier that the hydrogen absorption/desorption reaction must overcome, hence improving the hydrogen storage kinetics of the alloys. The dehydriding activation energy of the alloys is 128.19, 101.67, and 95.49 kJ mol−1 H2, and the hydrogenation enthalpy of the alloys is −81.72, −80.65, and −79.28 kJ mol−1 H2 with x = 0, 5, and 10, respectively. Therefore, the addition of the CoS2 catalyst significantly improves the hydrogen storage kinetics but slightly reduces the stable thermodynamics of the hydrides.

Suggested Citation

  • Yuan, Zeming & Zhang, Yanghuan & Yang, Tai & Bu, Wengang & Guo, Shihai & Zhao, Dongliang, 2018. "Microstructure and enhanced gaseous hydrogen storage behavior of CoS2-catalyzed Sm5Mg41 alloy," Renewable Energy, Elsevier, vol. 116(PA), pages 878-891.
    • Handle: RePEc:eee:renene:v:116:y:2018:i:pa:p:878-891
    DOI: 10.1016/j.renene.2017.10.037
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    References listed on IDEAS

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    1. Wang, Yan & Shen, Yan & Qi, Kezhen & Cao, Zhongqiu & Zhang, Ke & Wu, Shiwei, 2016. "Nanostructured cobalt–phosphorous catalysts for hydrogen generation from hydrolysis of sodium borohydride solution," Renewable Energy, Elsevier, vol. 89(C), pages 285-294.
    2. Baniasadi, Ehsan, 2017. "Concurrent hydrogen and water production from brine water based on solar spectrum splitting: Process design and thermoeconomic analysis," Renewable Energy, Elsevier, vol. 102(PA), pages 50-64.
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    Cited by:

    1. Yong, Hui & Guo, Shihai & Yuan, Zeming & Qi, Yan & Zhao, Dongliang & Zhang, Yanghuan, 2020. "Catalytic effect of in situ formed Mg2Ni and REHx (RE: Ce and Y) on thermodynamics and kinetics of Mg-RE-Ni hydrogen storage alloy," Renewable Energy, Elsevier, vol. 157(C), pages 828-839.
    2. Zhang, Yanghuan & Li, Xufeng & Cai, Ying & Qi, Yan & Guo, Shihai & Zhao, Dongliang, 2019. "Improved hydrogen storage performances of Mg-Y-Ni-Cu alloys by melt spinning," Renewable Energy, Elsevier, vol. 138(C), pages 263-271.
    3. Yong, Hui & Wei, Xin & Hu, Jifan & Yuan, Zeming & Wu, Ming & Zhao, Dongliang & Zhang, Yanghuan, 2020. "Influence of Fe@C composite catalyst on the hydrogen storage properties of Mg–Ce–Y based alloy," Renewable Energy, Elsevier, vol. 162(C), pages 2153-2165.
    4. Zhang, Yanghuan & Zhang, Wei & Bu, Wengang & Cai, Ying & Qi, Yan & Guo, Shihai, 2019. "Improved hydrogen storage dynamics of amorphous and nanocrystalline Ce-Mg-Ni-based CeMg12-type alloys synthesized by ball milling," Renewable Energy, Elsevier, vol. 132(C), pages 167-175.
    5. Shang, Hongwei & Zhang, Yanghuan & Li, Yaqin & Qi, Yan & Guo, Shihai & Zhao, Dongliang, 2019. "Effects of adding over-stoichiometrical Ti and substituting Fe with Mn partly on structure and hydrogen storage performances of TiFe alloy," Renewable Energy, Elsevier, vol. 135(C), pages 1481-1498.
    6. Li, Jigang & Guo, Yanru & Jiang, Xiaojing & Li, Shuan & Li, Xingguo, 2020. "Hydrogen storage performances, kinetics and microstructure of Ti1.02Cr1.0Fe0.7-xMn0.3Alx alloy by Al substituting for Fe," Renewable Energy, Elsevier, vol. 153(C), pages 1140-1154.

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