Improved kinetic behaviour of Mg(NH2)2-2LiH doped with nanostructured K-modified-LixTiyOz for hydrogen storage

Gizer, Gökhan; Puszkiel, Julián; Riglos, Maria Victoria Castro; Pistidda, Claudio; Ramallo-López, José Martín; Mizrahi, Martin; Santoru, Antonio; Gemming, Thomas; Tseng, Jo Chi; Klassen, Thomas; Dornheim, Martin

Abstract

The system Mg(NH2)2 + 2LiH is considered as an interesting solid-state hydrogen storage material owing to its low thermodynamic stability of ca. 40kJ/mol H2 and high gravimetric hydrogen capacity of 5.6 wt.%. However, high kinetic barriers lead to slow absorption/desorption rates even at relatively high temperatures (>180 °C). In this work, we investigate the effects of the addition of K-modified LixTiyOz on the absorption/desorption behaviour of the Mg(NH2)2 + 2LiH system. In comparison with the pristine Mg(NH2)2 + 2LiH, the system containing a tiny amount of nanostructured K-modified LixTiyOz shows enhanced absorption/desorption behaviour. The doped material presents a sensibly reduced (∼30 °C) desorption onset temperature, notably shorter hydrogen absorption/desorption times and reversible hydrogen capacity of about 3 wt.% H2 upon cycling. Studies on the absorption/desorption processes and micro/nanostructural characterizations of the Mg(NH2)2 + 2LiH + K-modified LixTiyOz system hint to the fact that the presence of in situ formed nanostructure K2TiO3 is the main responsible for the observed improved kinetic behaviour.

Citation

Gizer, G., Puszkiel, J., Riglos, M. V. C., Pistidda, C., Ramallo-López, J. M., Mizrahi, M., Santoru, A., Gemming, T., Tseng, J. C., Klassen, T., & Dornheim, M. (2020). Improved kinetic behaviour of Mg(NH2)2-2LiH doped with nanostructured K-modified-LixTiyOz for hydrogen storage. Scientific Reports, 10, Article 8. https://doi.org/10.1038/s41598-019-55770-y

• Journal Article Type: Article
• Acceptance Date: Nov 27, 2019
• Online Publication Date: Jan 7, 2020
• Publication Date: Jan 7, 2020
• Deposit Date: Apr 3, 2025
• Publicly Available Date: Apr 7, 2025
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Article Number: 8
• DOI: https://doi.org/10.1038/s41598-019-55770-y
• Public URL: https://nottingham-repository.worktribe.com/output/34872616
• Publisher URL: https://www.nature.com/articles/s41598-019-55770-y