Can I read Physicochemical Mechanism for the Continuous Reaction of γ‐Al~2~O~3~‐Modified Aluminum Powder with Water on EtoBox?

Physicochemical Mechanism for the Continuous Reaction of γ‐Al~2~O~3~‐Modified Aluminum Powder with Water by Zhen‐Yan Deng; José M. F. Ferreira; Yoshihisa Tanaka; Jinhua Ye is a Materials Science article available to read on EtoBox.

What is Physicochemical Mechanism for the Continuous Reaction of γ‐Al~2~O~3~‐Modified Aluminum Powder with Water about?

Previous experiments showed that γ‐Al~2~O~3~‐modified Al powder could continuously react with water and generate hydrogen at room temperature under atmospheric pressure. In this work, a possible physicochemical mechanism is proposed. It reveals that a passive oxide film on Al particle surfaces is hydrated in water. OH^−^ ions are the main mobile species in the hydrated oxide film. When the hydrated front meets the metal Al surface, OH^−^ ions react with Al and release H~2~. Because of the limited H‐soluble capacity in small Al particles and the low permeability of the hydrated oxide film toward H^+^ species, H~2~ molecules accumulate and form small H~2~ gas bubbles at the Al:Al~2~O~3~ interface. When the reaction equilibrium pressure in H~2~ bubbles exceeds a critical gas pressure that the hydrated oxide film can sustain, the film on the Al particle surfaces breaks and the reaction of Al with water continues. As the surface oxide layer on modified Al particles has a lower tensile strength, the critical gas pressure in H~2~ bubbles is lower so that under an ambient condition, the reaction of modified Al particles with water is continuous. The proposed mechanism was further confirmed

Who reads Physicochemical Mechanism for the Continuous Reaction of γ‐Al~2~O~3~‐Modified Aluminum Powder with Water?

Author

Zhen‐Yan Deng; José M. F. Ferreira; Yoshihisa Tanaka; Jinhua Ye

Publisher

Wiley

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)