Hydrogen storage properties and reaction mechanisms of K2Mn(NH2)4–8LiH system

Wang, Jiang; Lei, Gangtie; Pistidda, Claudio; He, Teng; Cao, Hujun; Dornheim, Martin; Chen, Ping

Abstract

Hydrogen storage properties of K2Mn(NH2)4–8LiH were investigated by considering its de/re-hydrogenation properties and reaction mechanisms. Experimental results show that the dehydrogenated K2Mn(NH2)4–8LiH can be almost re-hydrogenated completely at 230 °C and 50 bar of H2 with a hydrogenation rate more than 1.0 wt%/min. In-situ synchrotron radiation powder X-ray diffraction (SR-PXD) and FTIR investigations reveal that during ball milling K2Mn(NH2)4 reacts with LiH to form LiNH2 and K–Mn-species1 which is probably a K–Mn-containing hydride. The ball milled sample releases hydrogen in a multi-step reaction with the formation of K3MnH5 and K–Mn-species2 as intermediates and Li2NH, Mn3N2 and MnN as final products. The full hydrogenated products are LiH, LiNH2, and K–Mn-species2. The K–Mn-species2 may play a critical role for the fast hydrogeneration. This work indicates that transition metal contained amide-hydride composite holds potentials for hydrogen storage.

Citation

Wang, J., Lei, G., Pistidda, C., He, T., Cao, H., Dornheim, M., & Chen, P. (2021). Hydrogen storage properties and reaction mechanisms of K2Mn(NH2)4–8LiH system. International Journal of Hydrogen Energy, 46(80), 40196-40202. https://doi.org/10.1016/j.ijhydene.2021.09.216

• Journal Article Type: Article
• Acceptance Date: Sep 24, 2021
• Online Publication Date: Nov 10, 2021
• Publication Date: Nov 10, 2021
• Deposit Date: Nov 14, 2024
• Journal: International Journal of Hydrogen Energy
• Print ISSN: 0360-3199
• Electronic ISSN: 1879-3487
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 80
• Pages: 40196-40202
• DOI: https://doi.org/10.1016/j.ijhydene.2021.09.216
• Keywords: Amide-hydride composite, Ternary transition metal amide ,Hydrogen storage, Kinetics K2Mn(NH2)4
• Public URL: https://nottingham-repository.worktribe.com/output/34872431
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0360319921038313?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Hydrogen storage properties and reaction mechanisms of K2Mn(NH2)4–8LiH system; Journal Title: International Journal of Hydrogen Energy; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ijhydene.2021.09.216; Content Type: article; Copyright: © 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.