Resolving two pathways of Al(OH)3 formation in hydrogen production from aluminum water reaction

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-06-05 DOI:10.1016/j.ijhydene.2025.05.311

Nur Fadhilah , Ruri Agung Wahyuono , Mahardika F. Rois , Doty Dewi Risanti

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引用次数: 0

Abstract

Hydrogen production from aluminum-water reactions is often limited by the formation of a passive alumina (Al₂O₃) layer that hinders reactivity. In this study, a new system was developed by incorporating sodium aluminate (NaAlO₂) into a sodium hydroxide (NaOH) solution, with all parameters, room temperature and pH 13, kept constant to isolate the effect of solution composition. A maximum hydrogen yield of 77.4 % was achieved at a NaAlO₂ concentration of 0.5 M. In-situ electrochemical characterization showed that the reaction is governed by charge transfer across three stages: Al₂O₃ hydration, formation of

{A l (O H)}_{4}^{-}

accompanied by hydrogen release, and subsequent conversion to Al(OH)₃. The precipitation of Al(OH)₃ occurs in two phases gibbsite and bayerite through fast and slow reaction pathways, respectively. These pathways governed by solution stability, as a NaOH + NaAlO₂ mixture tends to destabilize Al(OH)₃ precipitation.

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解析铝水反应制氢过程中Al(OH)3生成的两条途径

从铝-水反应中产生的氢通常受到被动氧化铝（Al2O3）层的形成的限制，这阻碍了反应性。本研究将铝酸钠（NaAlO2）加入到氢氧化钠（NaOH）溶液中，在室温和pH 13不变的条件下，分离溶液组成的影响，建立了一个新的体系。在NaAlO2浓度为0.5 m时，最大产氢率达到77.4%。原位电化学表征表明，该反应受三个阶段的电荷转移控制：Al2O3水化，Al(OH)4 -的形成伴随着氢的释放，随后转化为Al(OH)3。Al(OH)3的析出分别发生在三水铝石和bayerite两相中，反应途径为快反应和慢反应。这些途径受溶液稳定性的支配，因为NaOH + NaAlO2混合物倾向于破坏Al(OH)3的沉淀。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.