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Hydrogen absorption/desorption properties of light metal hydroxide systems

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Title: Hydrogen absorption/desorption properties of light metal hydroxide systems
Authors: Tanaka, Fuga Browse this author
Nakagawa, Yuki Browse this author
Isobe, Shigehito Browse this author →KAKEN DB
Hashimoto, Naoyuki Browse this author
Keywords: dehydrogenation
hydrogen storage
light metal hydroxide
Issue Date: 25-Mar-2020
Publisher: John Wiley & Sons
Journal Title: International Journal of Energy Research
Volume: 44
Issue: 4
Start Page: 2941
End Page: 2951
Publisher DOI: 10.1002/er.5113
Abstract: In light metal hydroxide systems, hydrogen desorption generally occurs in exothermic reactions; therefore, these reactions are irreversible in principle. However, according to theoretical calculation of thermodynamics, some of these systems can desorb hydrogen in endothermic reactions. In this research, several hydroxide systems were studied to clarify the reversibility of these systems. Six types of hydroxide systems (XH + Y(OH)(n), X: Li, Na, Y: Li, Na, Mg) were prepared by ball-milling, then the desorption properties of these systems were evaluated. As a result, NaH + LiOH and NaH + NaOH systems desorbed hydrogen in endothermic reactions. Also, NaH + NaOH system absorbed hydrogen almost 100% reversibly under 300 degrees C and 1.0 MPa H-2 pressure. The reversibility in NaH + LiOH system was not accomplished in our experimental condition, because high pressure of GPa order is required for the rehydrogenation. In order to modify the desorption kinetics, we added KH catalyst to NaH + LiOH and NaH + NaOH systems. The hydrogen desorption temperature of the two systems was decreased by addition of 1 mol% of KH. The catalytic effect on hydrogen desorption properties was sustained even after the rehydrogenation of KH-added NaH + NaOH system.
Rights: This is the peer reviewed version of the following article: Tanaka, F, Nakagawa, Y, Isobe, S, Hashimoto, N. Hydrogen absorption/desorption properties of light metal hydroxide systems. Int J Energy Res. 2020; 44: 2941– 2951., which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Type: article (author version)
Appears in Collections:エネルギー・マテリアル融合領域研究センター (Center for Advanced Research of Energy and Material) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中川 祐貴

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