Compositional flexibility in Li-N-H materials: implications for ammonia catalysis and hydrogen storage.
Compositional flexibility in Li-N-H materials: implications for ammonia catalysis and hydrogen storage.
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DOI：
10.1039/d1cp02440j
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发表时间：
2021-07-21
期刊：
影响因子：
--
通讯作者：
David WIF
中科院分区：
文献类型：
--
作者：
Makepeace JW;Brittain JM;Sukhwani Manghnani A;Murray CA;Wood TJ;David WIF
锂氮氢材料，特别是锂酰胺和亚胺锂，近年来已被探索用于各种储能应用。母体亚胺锂、反萤石晶体结构的组成变化与其易于储存氢和催化分解氨的优异性能有关。在这里，我们探索了Li-N-H固溶体反萤石结构的受控固态合成，从亚胺锂为主(Li4/3（NH2)2/3(NH)1/3或Li1.333NH1.667）到氮化锂的主要掺入（Li3.167(NH)0.416N0.584H0.584或Li3.167NH）。这些固溶体的形成被证明会导致样品的热稳定性和氨反应性的显著变化，突出了成分变化在气体储存和催化应用中控制材料性能的潜在用途。研究了基于亚胺锂抗萤石结构的宽固溶体及其储能功能。
Li–N–H materials, particularly lithium amide and lithium imide, have been explored for use in a variety of energy storage applications in recent years. Compositional variation within the parent lithium imide, anti-fluorite crystal structure has been related to both its facile storage of hydrogen and impressive catalytic performance for the decomposition of ammonia. Here, we explore the controlled solid-state synthesis of Li–N–H solid-solution anti-fluorite structures ranging from amide-dominated (Li4/3(NH2)2/3(NH)1/3 or Li1.333NH1.667) through lithium imide to majority incorporation of lithium nitride–hydride (Li3.167(NH)0.416N0.584H0.584 or Li3.167NH). Formation of these solid solutions is demonstrated to cause significant changes to the thermal stability and ammonia reactivity of the samples, highlighting the potential use of compositional variation to control the properties of the material in gas storage and catalytic applications. A wide solid solution based on the lithium imide anti-fluorite structure is demonstrated and related to its energy storage functions.
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