Hydrogen evolution and electrochemical behavior of Al in Al-air batteries with concentrated NaOH electrolytes

IF 10.7

Corrosion Communications Pub Date : 2026-03-01 Epub Date: 2025-06-27 DOI:10.1016/j.corcom.2024.10.002

Zihan Wang , Zhong Wu , Yingjie Liu , Jinfeng Zhang , Yao Yang , Jing Xu , Tong Zhao , Yang Zhu , Zhenbo Qin , Wenbin Hu

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Abstract

Alkaline Aluminum-air (Al-air) batteries are gaining increasing interest due to their high theoretical energy density and intrinsic safety, which are promising for energy storage applications. Hydrogen evolution and discharge behavior of Al electrodes are examined in concentrated NaOH solutions (> 4 mol L^-1) through a series of full-cell discharge and electrochemical tests. The relationship between hydrogen evolution and discharge behavior of Al electrodes is clarified. Results indicate that in alkaline Al-air batteries, Al electrode generates a small quantity of hydrogen with a discharge current increasing (up to 40 mA cm^-2). Highly concentrated NaOH solution is optimal for high-current discharge scenarios. As the concentration of NaOH increases, the accumulation of reaction products on the surface of Al electrode occurs, resulting in alteration of discharge behavior and hydrogen evolution.

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浓氢氧化钠铝空气电池中Al的析氢和电化学行为

碱性铝-空气（Al-air）电池由于其较高的理论能量密度和固有安全性，在储能应用中具有广阔的前景，因此越来越受到人们的关注。通过一系列的全电池放电和电化学测试，研究了铝电极在浓NaOH溶液（> 4 mol L-1）中的析氢和放电行为。阐明了析氢与铝电极放电行为的关系。结果表明，在碱性铝空气电池中，随着放电电流的增大，铝电极产生少量氢气（放电电流可达40 mA cm-2）。高浓度NaOH溶液是大电流放电场景的最佳选择。随着NaOH浓度的增加，反应产物在Al电极表面积累，导致放电行为和析氢发生改变。

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来源期刊

Corrosion Communications

CiteScore

7.30

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0.00%

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