| 초록 |
Major countries around the world are paying attention to 'hydrogen energy' as the next-generation energy source. Since hydrogen does not emit pollutants even after combustion, it is considered an eco-friendly alternative to fossil fuels such as coal and petroleum. Therefore, hydrogen is a next-generation energy source prepared for the era of the hydrogen economy, and various studies are being conducted in various fields such as manufacturing, storage, and use. Among them, many studies are being conducted to safely and efficiently store hydrogen because it requires attention to efficiency and stability when storing hydrogen. In particular, Mg and Mg-based materials are lightweight, low-cost materials with high hydrogen storage capacity, but have a disadvantage in that the reaction rate is slow. Accordingly, in order to improve the hydriding kinetics using CaO, an alkaline earth metal oxide as a catalyst, a hydrogen induced mechanical alloying (HIMA) was performed to synthesize a composite, and then the hydriding kinetics was evaluated. XRD, SEM, BET, and TGA analyzes were performed and kinetics were evaluated using an automated PCT measurement system. In absorption kinetics tests, Mg2NiHx-5, 10, 20wt% CaO composites were evaluated to have up to 1.14wt%, 1.17wt%, and 1.19wt% hydrogen absorption within 3600 seconds at 623K. In this study, Material life cycle evaluation was performed to analyze the environmental impact characteristics of the Mg2NiHx-5, 10, 20wt% CaO composites manufacturing process. The software of MLCA(Material Life Cycle Assessment) was performed by Gabi. As a result, the contents of Global warming potential (GWP) and fossil fuels were founded to have a higher impact than other impact categories.
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