Conversion of magnesium waste into a complex magnesium hydride system: Mg(NH2)2–LiH
| Autor: | Claudio Pistidda, Thomas Gemming, Anna-Lisa Chaudhary, Martin Dornheim, Thomas Klassen, Giovanni Capurso, Hujun Cao, Julián Puszkiel, Ping Chen, Michael T. Wharmby, Maria Victoria Castro Riglos, Jo-Chi Tseng |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Magnesium Composite number Magnesium hydride Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition 0104 chemical sciences Hydrogen storage chemistry.chemical_compound Fuel Technology chemistry Chemical engineering engineering Gravimetric analysis Dehydrogenation 0210 nano-technology |
| Zdroj: | Sustainable Energy & Fuels. 4:1915-1923 |
| ISSN: | 2398-4902 |
| Popis: | The Mg(NH2)2–2LiH composite has been regarded as a promising on-board hydrogen storage material, due to its favorable thermodynamics and high H2 gravimetric capacity. In this paper, a new route to synthesize the Mg(NH2)2–2LiH composite, starting from hydrogenated Li2Mg(NH)2, is presented. Li2Mg(NH)2 is obtained from the decomposition of a mixture of a magnesium waste alloy (AZ91) and LiH, after a multi-step treatment. The as-prepared Mg(NH2)2–2LiH with Mg coming from AZ91 shows improved hydrogen storage properties, as compared with that synthesized from pure magnesium powder, with a lower dehydrogenation peak temperature of about 15 °C. The reaction pathways during the conversion of the AZ91 alloy to Mg(NH2)2–2LiH are investigated by ex situ and in situ XRD techniques. The obtained results confirm that this new approach is an effective way to recycle magnesium waste alloys into lightweight hydrogen storage materials. In addition, this new technology is easy to scale up and reduces the cost of Mg(NH2)2–2LiH, which has important significance for its practical applications. |
| Databáze: | OpenAIRE |
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