Fabrication of AlLi and Al 2Li 3/Al 4Li 9 intermetallic compounds by molten salt electrolysis and their application for hydrogen generation from water

Meng Chang Lin, Jun Yen Uan, Te Chang Tsai

研究成果: 雜誌貢獻文章同行評審

10 引文 斯高帕斯(Scopus)

摘要

The concept of "hydrogen on demand" has been widely publicized. More importantly, the materials used to produce hydrogen on demand should be in themselves safe to handle. In present work, Al-Li intermetallic compounds (IMC) were fabricated in air by electrolysis from LiCl-KCl molten salt at 480 ± 25 °C. Bulk AlLi IMC and the bulk compound with mixture of Al 2Li 3 and Al 4Li 9 (Al 2Li 3/Al 4Li 9 IMC) were not pyrophoric and can be safely handled in air. When both compounds in contact with water, vigorous reaction occurred and H 2 was directly produced. The by-products after H 2 generation from AlLi IMC were a mixture of Li-containing α-Al and Li-Al hydrotalcite (hereafter referred to as Li-Al LDH). The by-product after H 2 generation from Al 2Li 3/Al 4Li 9 compound was a mixture of LiOH·H 2O and Li-Al LDH. Those by-products can be easily separated from water and may be reused as a resource. Approximately 500-860 ml of H 2 per weight (g) of the IMC compounds was generated in deionized water at room temperature. Experimentally, AlLi IMC powder and Al 2Li 3/Al 4Li 9 compound exhibit gravimetric hydrogen capacity of 7.0 wt.% and 5.4 wt.%, respectively. Although the energy consumed for fabricating Al-Li IMC compounds is a little larger than the energy provided by the generated H 2, the Al-Li IMC compounds are promising materials for producing hydrogen on demand without the necessity of hydrogen storage. Highlights: AlLi and Al 2Li 3/Al 4Li 9 compounds vigorously reacted with water to generate hydrogen. Al-Li IMC could exhibit gravimetric hydrogen capacity of 5.4-7.0 wt.%. No catalyst was used in the hydrogen generation reaction. The Al-Li intermetallic compounds could be prepared in air.
原文英語
頁(從 - 到)13731-13736
頁數6
期刊International Journal of Hydrogen Energy
37
發行號18
DOIs
出版狀態已發佈 - 9月 2012
對外發佈

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 燃料技術
  • 凝聚態物理學
  • 能源工程與電力技術

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