Promoted hydrolysis performances and mechanism of Si-NaBH4-AlCl3 in deionized water

doi:10.1016/j.cjche.2020.08.019

Abstract

Abstract: Si-based hydrolysis material system can be used in mobile/portable hydrogen source applications connected to fuel cells but is limited by alkaline solutions. In the present research, we reported an acid/alkaline free hydrolysis system combining silicon with NaBH₄. Samples with different ratios between Si and NaBH₄ are prepared via high energy ball milling and hydrolyzed in deionized water at different temperatures. Synergetic effect between silicon and NaBH₄ was found in the hydrolysis process. 2Si-NaBH₄ sample displays the best hydrolysis performances with the hydrogen yield of 1594 ml·g^-1 in deionized water at 70℃. Thereafter, AlCl₃ is added into the 2Si-NaBH₄ sample to further improve its comprehensive properties. The effect of AlCl₃ content and promotion mechanism of the reaction are explored. 2Si-NaBH₄-5 wt% AlCl₃ sample shows a significant improvement with a high hydrogen yield of 1689 ml·g^-1 in deionized water at 70℃ and a corresponding conversion rate of 95.8%, indicating that the Si-NaBH₄-AlCl₃ composite is promising to be a hydrogen source in applications of mobile/portable fuelcell-powered facilities.

Key words: Hydrolysis, Hydrogen generation, Si-NaBH₄-AlCl₃ composite, Synergetic effect

摘要： Si-based hydrolysis material system can be used in mobile/portable hydrogen source applications connected to fuel cells but is limited by alkaline solutions. In the present research, we reported an acid/alkaline free hydrolysis system combining silicon with NaBH₄. Samples with different ratios between Si and NaBH₄ are prepared via high energy ball milling and hydrolyzed in deionized water at different temperatures. Synergetic effect between silicon and NaBH₄ was found in the hydrolysis process. 2Si-NaBH₄ sample displays the best hydrolysis performances with the hydrogen yield of 1594 ml·g^-1 in deionized water at 70℃. Thereafter, AlCl₃ is added into the 2Si-NaBH₄ sample to further improve its comprehensive properties. The effect of AlCl₃ content and promotion mechanism of the reaction are explored. 2Si-NaBH₄-5 wt% AlCl₃ sample shows a significant improvement with a high hydrogen yield of 1689 ml·g^-1 in deionized water at 70℃ and a corresponding conversion rate of 95.8%, indicating that the Si-NaBH₄-AlCl₃ composite is promising to be a hydrogen source in applications of mobile/portable fuelcell-powered facilities.

关键词: Hydrolysis, Hydrogen generation, Si-NaBH₄-AlCl₃ composite, Synergetic effect

Zhao Feng, Chaoling Wu, Shuang Zhong, Yungui Chen, Hui Chen, Yao Wang. Promoted hydrolysis performances and mechanism of Si-NaBH₄-AlCl₃ in deionized water[J]. Chinese Journal of Chemical Engineering, 2020, 28(12): 3136-3144.

Zhao Feng, Chaoling Wu, Shuang Zhong, Yungui Chen, Hui Chen, Yao Wang. Promoted hydrolysis performances and mechanism of Si-NaBH₄-AlCl₃ in deionized water[J]. 中国化学工程学报, 2020, 28(12): 3136-3144.

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Promoted hydrolysis performances and mechanism of Si-NaBH₄-AlCl₃ in deionized water

Promoted hydrolysis performances and mechanism of Si-NaBH₄-AlCl₃ in deionized water

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