In this research, dehydrogenation properties of several hydride-hydroxide systems containing KH and KOH have been evaluated. Six types of hydride-hydroxide systems (KH-M[OH]_n, MH_m-KOH, M: Li, Na, Mg) were prepared by ball milling method. We expected reaction formula of these six systems with assumption, that is, oxides would form after dehydrogenation. The hydrogen desorption properties of these systems were evaluated by TG-DTA and MS. From the results of XRD before and after dehydrogenation, we obtained actual reaction formulas, which were different from expected formulas. Among six systems, it was confirmed that only KH-LiOH system dehydrogenated in endothermic. This means that KH-LiOH system can reversibly ab/desorb hydrogen in principle. However, it is calculated that extremely high pressure of GPa order is required for rehydrogenation of KH-LiOH system.

中文翻译：

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含钾氢化物-氢氧化物体系的脱氢特性

在这项研究中，评估了几种含有 KH 和 KOH 的氢化物-氢氧化物系统的脱氢性能。六种氢化物-氢氧化物体系（KH - M [OH] _n , M H _m -KOH, M: Li, Na, Mg) 通过球磨法制备。我们假设这六种体系的反应式，即脱氢后会形成氧化物。这些系统的氢解吸性能通过 TG-DTA 和 MS 进行评估。从脱氢前后的XRD结果，我们得到了与预期不同的实际反应式。在六个体系中，确认只有KH-LiOH体系吸热脱氢。这意味着 KH-LiOH 系统原则上可以可逆地吸收/解吸氢气。然而，据计算，KH-LiOH体系的再氢化需要GPa级的极高压力。