On mechanism of hydrogen generation at oxidation of activated aluminum in aqueous solutions

To clarify the mechanism of hydrogen generation upon aluminum oxidation by water, the behavior of the mechanical alloys {Al+20%Bi} and {Al+7%Ga+3%In} in various salt solutions has been studied. Analysis of the reaction rate and the overall hydrogen yield in the studied systems allows us to suggest t...

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Bibliographic Details
Published in:International journal of hydrogen energy 2024-02, Vol.54, p.428-436
Main Authors: Sevastyanova, L.G., Klyamkin, S.N., Stupnikov, V.A., Ilyukhina, A.V., Bulychev, B.M.
Format: Article
Language:English
Subjects:
Aluminum
Bismuth
Ga–in
Hydrogen generation
Mechanical alloys
Salt solutions
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Summary:To clarify the mechanism of hydrogen generation upon aluminum oxidation by water, the behavior of the mechanical alloys {Al+20%Bi} and {Al+7%Ga+3%In} in various salt solutions has been studied. Analysis of the reaction rate and the overall hydrogen yield in the studied systems allows us to suggest that, unlike the oxidation of magnesium-based materials, the hydrogen generation by activated aluminum is not mainly controlled by electrochemical processes. Additives of activating metals, bismuth and gallium-indium alloys, primarily act as surfactants, making an unoxidized intergranular surface accessible to water according to the Rebinder effect. •Effect of salt solutions on H2 generation by aluminum-based composition has been studied.•Reaction is not mainly controlled by electrochemical processes.•Activating metals, bismuth and gallium-indium alloys, primarily act as surfactants.•Salts affect activity of metal additives and properties Al oxidation products.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.07.224