Metastable energetic nanocomposites of MOF-activated aluminum featured with multi-level energy releases
Metastable energetic nanocomposites of MOF-activated aluminum featured with multi-level energy releases
复制标题
MOF激活铝亚稳态含能纳米复合材料具有多级能量释放
DOI：
10.1016/j.cej.2019.122623
复制
发表时间：
2020-02-01
影响因子：
15.1
通讯作者：
Yan, Qi-Long
中科院分区：
文献类型：
--
作者：
He, Wei;Ao, Wen;Yan, Qi-Long
具有受控释放方式的高能量存储的开发总是令人期望的，但具有挑战性。在此，已经证明了一种基于铝的储能系统的新设计，其具有改进的能量含量。这组混合材料使用高能金属有机框架（EMOFs）作为金属氧化物的前体，作为传统纳米热敏材料中的氧化剂。这些亚稳态纳米复合材料的高能MOF激活的铝（n-Al@EMOFs）能够进行自我可持续的燃烧与多层次的能量释放。所制备的n-Al@EMOFs表现出独特的两步放热过程，其总放热量高达4142 J g（-1），远高于传统Al/CuO体系。此外，该策略还有助于降低n-Al对表面氧化的高敏感性，并降低复合材料的点火温度（301.5 ℃）。
Development of the high energy storage with controlled way of releases is always desirable but challenging. Herein, a novel design of energy-storage system based on aluminum has been demonstrated with improved energy content. This group of hybrid materials uses energetic metal-organic frameworks (EMOFs) as the precursors of the metal oxides as the oxidizers in conventional nanothermites. These metastable nanocomposites of energetic MOF-activated Al (n-Al@EMOFs) are able to undergo self-sustainable combustion with multi-level energy releases. The resulted n-Al@EMOFs show unique two-step exothermic processes with a total heat release of as highly as 4142 J g(-1), which is much higher than that of conventional Al/CuO system. In addition, the strategy could also help to reduce the high susceptibility of n-Al to surface oxidation and lower the ignition temperature of the composites (301.5 degrees C).