聚合物
氢气储存
材料科学
吸附
氢
化学工程
纳米晶
纳米晶材料
复合材料
高分子化学
化学
纳米技术
有机化学
吸附
工程类
作者
Anne M. Ruminski,Rizia Bardhan,Alyssa Brand,Shaul Aloni,Jeffrey J. Urban
摘要
The role of encapsulating polymers in nanocrystalline Mg air stability and hydrogen storage density was studied for a series of composites varying in both % Mg and polymer identity. In these materials, the Mg nanocrystals are completely dependent on the polymer for air stability. Remarkably, both air stability and hydrogen sorption capacity of poly(methyl methacrylate) composites were enhanced by reducing the amount of polymer. Composites consisting of 65 wt% Mg absorbed 6.95 wt% hydrogen and showed little oxidation after 3 months air exposure even after enduring the volume expansion induced by hydrogen sorption, whereas composites with 33.2 wt% Mg absorbed just 4.86 wt% hydrogen and were completely oxidized upon air exposure after hydrogen sorption. This surprising synergistic enhancement in stability and storage density is attributed to an increase in the tortuosity of the paths of gas molecules and increased interfacial structure-templating regions, which scale with % Mg loading and lead to nanoparticle entanglements, hindering polymer chain motion.
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