Liu Shiyuan, Liu Jieyuan, Liu Xiaofang, Shang Jiaxiang, Xu Li, Yu Ronghai, Shui Jianglan
School of Materials Science and Engineering, Beihang University, Beijing, China.
State Grid Smart Grid Research Institute, Future Science and Technology City, Beijing, China.
Nat Nanotechnol. 2021 Mar;16(3):331-336. doi: 10.1038/s41565-020-00818-8. Epub 2021 Jan 4.
Hydrogen storage materials are the key to hydrogen energy utilization. However, current materials can hardly meet the storage capacity and/or operability requirements of practical applications. Here we report an advancement in hydrogen storage performance and related mechanism based on a hydrofluoric acid incompletely etched MXene, namely, a multilayered TiCT (T is a functional group) stack that shows an unprecedented hydrogen uptake of 8.8 wt% at room temperature and 60 bar H. Even under completely ambient conditions (25 °C, 1 bar air), TiCT is still able to retain ~4 wt% hydrogen. The hydrogen storage is stable and reversible in the material, and the hydrogen release is controllable by pressure and temperature below 95 °C. The storage mechanism is deduced to be a nanopump-effect-assisted weak chemisorption in the sub-nanoscale interlayer space of the material. Such a storage approach provides a promising strategy for designing practical hydrogen storage materials.
储氢材料是氢能利用的关键。然而，目前的材料很难满足实际应用的储存容量和/或可操作性要求。在此，我们报道了基于氢氟酸不完全蚀刻的MXene的储氢性能及相关机理的进展，即多层TiCT（T为官能团）堆叠结构，该结构在室温及60巴氢气压力下展现出前所未有的8.8 wt%的氢吸收量。即使在完全环境条件（25 °C，1巴空气）下，TiCT仍能够保留约4 wt%的氢。材料中的储氢过程是稳定且可逆的，并且在95 °C以下，氢的释放可通过压力和温度进行控制。储存机理推断为材料亚纳米级层间空间中的纳米泵效应辅助弱化学吸附。这种储存方法为设计实用的储氢材料提供了一种有前景的策略。
