Sorption properties of Mg-Ni-CrCl₃ hydrogen storage composite

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ÎÄÕÂÒ³Â룺147 - 151

Key words£ºMg-Ni-CrCl₃ composite£» hydrogen storage materials£» reactive milling£» multi components addition£» stability£» calorific effects

Abstract: Hydrogen absorption composite powder of Mg incorporated with Ni and CrCl₃ £¨88¡Ã10¡Ã2 in mass ratio£© was prepared by reactive milling in hydrogen atmosphere. Hydriding/dehydriding performances were measured by self-made apparatus. The results show that reactive milling and multi-component addition of Ni and CrCl₃ reduce the stability of hydride and improve the sorption performance of Mg-based materials. With powder milled for 60¤@h, hydriding basically completes within 300¤@s £¨250¤@¡æ, 2.0¤@MPa£© and phase transformation fraction reaches 0.78. The phase transformation rate of hydriding/dehydriding progress increases significantly with the reduced particles size of powder while good kinetics of dehydriding at a relatively low temperature is gained with small grain size of hydride. Rapid temperature variations in a short span of time resulted from remarkable calorific effects of rapid phase transformation are detected in hydriding/dehydriding progress. The results of thermogravimetric and differential scanning calorimetric£¨TG/DSC£© indicate that the onset temperature of desorption of composite milled for 100¤@h is 272¤@¡æ.