Construction of Carbon Covered Mg 2NiH 4 Nanocrystalline for Hydrogen Storage
SSRN Electronic Journal
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Decreasing the desorption temperature and formation enthalpy are two key challenges for the practical application of magnesium-based hydrogen storage materials. In this paper, different Mg2Ni samples were successfully synthesized, and the corresponding hydrogen storage kinetic and thermodynamic behaviors were investigated. The carbon-covered nanocrystalline Mg2Ni could start to take up hydrogen at room temperature and release hydrogen at 180 °C. Meanwhile, the hydrogenated sample fully desorbed hydrogen at 250 °C within 10 min, and absorbed 2.1 wt% hydrogen in 1 h at 125°C. The absorption and desorption activation energy of carbon-covered nanocrystalline Mg2Ni was calculated to be 18.3 ± 0.2 kJ/mol and 34.1 ± 2.4 kJ/mol, which were 75 % and 78 % lower than that of MgH2, respectively. The dehydrogenation enthalpy of the carbon-covered nanocrystalline Mg2NiH4 sample was also reduced from 84.9 ± 5.3 kJ/mol of MgH2 to 67.3 ± 1.0 kJ/mol. In addition, the cycling kinetics was maintained even after ten cycles. Further analysis revealed that the remarkably improved hydrogen storage property of Mg2NiH4 originated from the combining effect of the alloying, carbon covering, and nanocrystalline strategy.
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