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Title: Hydrogen sorption behaviour of Mg-5wt.%La alloys after the initial hydrogen absorption process
Authors: Kim, MJ
Tan, XF
Gu, QF
McDonald, SD
Ali, Y
Matsumura, S
Nogita, K
Keywords: Alloys
Hydrogen storage
Transmission electron microscopy
Issue Date: 29-Apr-2022
Publisher: Elsevier B. V.
Citation: Kim, M., Tan, X. F., Gu, Q., McDonald, S. D., Ali, Y., Matsumura, S., & Nogita, K. (2022). Hydrogen sorption behaviour of Mg-5wt.%La alloys after the initial hydrogen absorption process. International Journal of Hydrogen Energy. (In Press). doi:10.1016/j.ijhydene.2022.03.102
Abstract: In our earlier study, it has been shown that trace Na additions can improve the reaction kinetics of Mg–5%La (wt.%) alloys during the first absorption. However, the subsequent hydrogen desorption/absorption process of the Mg–5%La after the first absorption has not been investigated. In this study, we have investigated the hydrogen sorption behaviour of the Mg–5%La alloy after the first absorption in terms of phase evolution, and lattice expansion properties during desorption as function of temperature using in-situ synchrotron Powder X-ray Diffraction (PXRD) and in-situ High Voltage Transmission Electron Microscopy (HVTEM). Two distinct phase evolutions, a continuous phase transformation of LaH3 → LaH2 + ½ H2 (from 250 °C) and decomposition of MgH2 → Mg + H2 (between 440 and 460 °C) were identified during the desorption. It is determined that this alloy is cyclable in the absence of Mg12La intermetallic during the subsequent absorption/desorption cycling after the first hydrogen absorption. © 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd
ISSN: 0360-3199
Appears in Collections:Journal Articles

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