The mechanochemistry of lanthanum dihydride (LaH\(_{2}\)) with hydrogen (H\(_{2}\)) using the ball-mill process and the effect of oxidation on the resulting products

Authors

  • Andika Widya PRAMONO Research Center for Advanced Materials – National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Satrio HERBIROWO Research Center for Advanced Materials – National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Agung IMADUDDIN Research Center for Advanced Materials – National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Iwan Dwi ANTORO Research Center for Advanced Materials – National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Heri NUGRAHA Research Center for Energy Conversion and Conservation - National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Hendrik Research Center for Metallurgy - National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Anung SYAMPURWADI Research Center for Advanced Materials – National Research and Innovation Agency (BRIN), Kawasan Puspiptek, Tangerang Selatan 15314, Banten, Indonesia
  • Ines Hayatun NUFUS Physics Study Program, Universitas Islam Negeri Sultan Maulana Hasanuddin, Gedung Dekanat Fakultas Sains, Kampus 2, Jalan Syekh Moh. Nawawi Albantani, Kemanisan, Kec. Curug, Kota Serang 42171, Banten, Indonesia
  • Nihayatul UMNA Physics Study Program, Universitas Islam Negeri Sultan Maulana Hasanuddin, Gedung Dekanat Fakultas Sains, Kampus 2, Jalan Syekh Moh. Nawawi Albantani, Kemanisan, Kec. Curug, Kota Serang 42171, Banten, Indonesia
  • Silvia Farah DIBA Physics Study Program, Universitas Islam Negeri Sultan Maulana Hasanuddin, Gedung Dekanat Fakultas Sains, Kampus 2, Jalan Syekh Moh. Nawawi Albantani, Kemanisan, Kec. Curug, Kota Serang 42171, Banten, Indonesia
  • Fina Fitratun AMALIYAH Physics Study Program, Universitas Islam Negeri Sultan Maulana Hasanuddin, Gedung Dekanat Fakultas Sains, Kampus 2, Jalan Syekh Moh. Nawawi Albantani, Kemanisan, Kec. Curug, Kota Serang 42171, Banten, Indonesia

DOI:

https://doi.org/10.55713/jmmm.v34i2.1825

Keywords:

ball-mill process, hydrogen storage, lanthanum dihydride, mechanochemistry, oxidation

Abstract

The complex behavior of LaH2 during ball milling was investigated in this study, with its mechanical, chemical, and morphological changes explored. The relationship between milling time and hydrogen pressure reduction was uncovered through detailed experiments, reflecting the dynamic nature of the process. A transient yet significant event was observed upon unsealing the milling jar post-milling: the emergence of a minor fire ember, indicative of the interplay between mechanical forces and chemical reactivity within the LaH2 powder. Profound changes in the structure, composition, and shape were unraveled using advanced techniques such as X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDX), and particle size distribution analysis. The resulting powder exhibited a dual-phase composition of lanthanum dihydride (LaH2, 68.1% to 71.5%) and lanthanum oxide (La2O3, 28.5% to 31.9%), reflecting a dynamic chemical equilibrium during milling. Particle size distribution analysis revealed a notable increase in average diameter to 6420 nm, accompanied by a polydispersity index (PDI) of 0.831, signifying a broadening compared to the initial LaH2 powder. The morphological evolution of the powder was elucidated through SEM imaging, showing predominantly spherical and rounded forms, indicating extensive particle agglomeration and plastic deformation during milling. Additionally, the formation of oxide layers on the powder surface, intertwined with pronounced particle agglomeration, was highlighted through EDX mapping, shedding light on the mechanical aspects of morphological evolution during milling. These findings contribute to our understanding of LaH2 behavior under extreme mechanical and chemical conditions and have implications for materials processing, hydrogen storage technologies, and broader applications in materials science and engineering.

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Published

2024-06-04

How to Cite

[1]
A. W. PRAMONO, “The mechanochemistry of lanthanum dihydride (LaH\(_{2}\)) with hydrogen (H\(_{2}\)) using the ball-mill process and the effect of oxidation on the resulting products”, J Met Mater Miner, vol. 34, no. 2, p. 1825, Jun. 2024.

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