Optimization of parameters during the milling preparation and properties analysis of magnesium-carbon composite hydrogen storage materials

摘要

With microcrystalline carbon as the grinding aid after anthracite coal carbonization, magnesium goesrnthrough the ball milling process in hydrogen atmosphere during the preparation of magnesium-carbonrncomposite hydrogen storage materials. In the materials preparation and analysis, various test parametersrnhave a huge impact on the morphology and properties of composite materials. Experimental results showrnthat with ball milling time increased, the hydrogen storage density of materials increased at first, thenrntended towards the saturation state about 3 wt.%, and so do the composites density with metal nickel. Atrnthe same time, the number of desorption endothermic peaks increased with milling time, thernnon-crystallization occurs, and the hydrogen desorption temperature increased from about 275 ℃ tornabout 330 ℃ from DSC curves. In addition, with the number of cycle hydrogen absorption/desorptionrnincreases, hydrogen storage density attenuate approximately from 5 wt.% to 3 wt.%, and initial desorptionrntemperature of hydrogen composites is 267.8 ℃ after second ball milling in hydrogen which is similar tornthe first initial temperature.