Abstract Kinetic properties of compacted LiNH2–LiH developed by doping with TiF4 and multi-walled nanotubes (MWCNTs) as well as upscaling to small hydrogen storage tank are proposed. During de/rehydrogenation, transition metal-based catalyst (TiF4) provides the catalytic effects on hydrogen dissociation/recombination, while MWCNTs benefit thermal conductivity and hydrogen permeability. Enhanced dehydrogenation kinetics is observed from single-step reaction at narrower and lower temperature range of 150–350 °C (100 °C lower than the compacted LiNH2–LiH without additives) together with long plateau temperature and constant hydrogen flow rate (50 SCCM) up to 30 min during desorption of the small tank. Hydrogen contents de/absorbed during 5–6 cycles increase from 1.90-2.40 to 3.10-4.70 wt % H2 (from 29 to up to 80% of theoretical capacity). Li5TiN3 detected upon cycling absorbs NH3 to form Li5TiN3(NH3)x, favoring hydrogen sorption properties of LiNH2–LiH system. Moreover, comparable reaction mechanisms and performances are found at different positions inside the tank of compacted LiNH2–LiH doped with TiF4 and MWCNTs.

中文翻译：

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通过掺杂 TiF4 和 MWCNTs 改善紧凑型 LiNH2-LiH 基小型储氢罐的吸氢动力学

摘要 提出了通过掺杂 TiF4 和多壁纳米管 (MWCNT) 以及升级到小型储氢罐而开发的压实 LiNH2–LiH 的动力学特性。在脱氢/再氢化过程中，过渡金属基催化剂 (TiF4) 对氢解离/重组提供催化作用，而 MWCNTs 有利于导热性和氢渗透性。在较窄和较低的 150–350 °C 温度范围（比没有添加剂的压实 LiNH2–LiH 低 100 °C）以及长平台温度和恒定氢气流速（50 SCCM）下的单步反应中观察到增强的脱氢动力学在小罐的解吸过程中长达 30 分钟。在 5-6 次循环期间释放/吸收的氢含量从 1.90-2.40 wt% H2 增加到 3.10-4.70 wt% H2（从理论容量的 29% 增加到高达 80%）。在循环过程中检测到的 Li5TiN3 吸收 NH3 形成 Li5TiN3(NH3)x，有利于 LiNH2-LiH 系统的吸氢特性。此外，在掺杂有 TiF4 和 MWCNT 的压实 LiNH2-LiH 罐内的不同位置发现了类似的反应机制和性能。