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 Ti2CTx (T is a functional group) stack that shows an unprecedented hydrogen uptake of 8.8 wt% at room temperature and 60 bar H2. Even under completely ambient conditions (25 °C, 1 bar air), Ti2CTx 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.
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This work was financially supported by National Natural Science Foundation of China (21673014, 21975010 and 51731002). We thank X. G. Li (Peking University) for assistance in the hydrogen storage measurement. We acknowledge the General Purpose Powder Diffractometer at the China Spallation Neutron Source for providing the neutron powder diffraction analysis.
The authors declare no competing interests.
Peer review information Nature Nanotechnology thanks the anonymous reviewers for their contribution to the peer review of this work.
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Supplementary Figs. 1–24, Tables 1–5, Videos 1–4 and refs. 1–22.
Infrared thermal video of the ignition and combustion processes of a fully hydrogenated Ti2CTx disc.
Infrared thermal video of the ignition and combustion processes of a dehydrogenated Ti2CTx disc.
Video of the ignition and combustion processes of a hydrogenated Ti2CTx disc.
Video of the ignition and combustion processes of a dehydrogenated Ti2CTx disc.
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Liu, S., Liu, J., Liu, X. et al. Hydrogen storage in incompletely etched multilayer Ti2CTx at room temperature. Nat. Nanotechnol. (2021). https://doi.org/10.1038/s41565-020-00818-8