Enhancing Hydrogen-Generation Performance of γ-AI_2O_3 Modified Al Powder by Ultrasonic Dispersion

摘要

Previous work indicated that y-Al_2O_3 modified Al powder could react with water and generate hydrogen under ambient conditions. In this work, an ultrasonic dispersion procedure was used to disperse and mix the Al and γ-Al_2O_3 powders. It was found that γ-Al_2O_3 modified Al powder prepared by the ultrasonic procedure has a higher hydrogen-generation speed than that prepared by a traditional ball-milling method. Micro-structure analyses showed that the ultrasonic procedure greatly eliminated the agglomeration of Al and γ-Al_2O_3 powders so that y-Al_2O_3 grains covered Al particle surfaces more uniformly. This implies that a favorable processing procedure is the key to obtain high performance modified Al powder.