Desorption reaction in MgH2 studied with in situ μ+SR

Jun Sugiyama; Izumi Umegaki; Mitsuru Matsumoto; Kazutoshi Miwa; Hiroshi Nozaki; Yuki Higuchi; Tatsuo Noritake; Ola K. Forslund; Martin Månsson; Stephen P. Cottrell; Akihiro Koda; Eduardo J. Ansaldo; Jess H. Brewer

doi:10.1039/C8SE00568K

Desorption reaction in MgH₂ studied with in situ μ⁺SR

Jun Sugiyama,

*^a Izumi Umegaki,^a Mitsuru Matsumoto,^a Kazutoshi Miwa,^a Hiroshi Nozaki,^a Yuki Higuchi,^a Tatsuo Noritake,^a Ola K. Forslund,^b Martin Månsson,^b Stephen P. Cottrell,^c Akihiro Koda,^d Eduardo J. Ansaldo^e and Jess H. Brewer

^fg

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* Corresponding authors

^a Toyota Central Research & Development Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi, Japan
E-mail: e0589@mosk.tytlabs.co.jp, juns@triumf.ca
Fax: +81-561-63-6920
Tel: +81-561-71-8029

^b Department of Applied Physics, KTH Royal Institute of Technology, Electrum 229, SE-16440 Kista, Stockholm, Sweden

^c ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX UK

^d Muon Laboratory, J-PARC, KEK, Tokai, Ibaraki, Japan

^e Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, SK, S7N 5E2 Canada

^f Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1 Canada

^g TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3 Canada

Abstract

In order to study the mechanism determining the desorption temperature (T_d) of hydrogen storage materials, we have measured positive muon spin rotation and relaxation (μ⁺SR) in MgH₂ over a wide temperature range including its T_d. The pressure in the sample cell due to desorbed H₂ was measured in parallel with the μ⁺SR measurements under static conditions. Such in situ μ⁺SR measurements revealed that hydrogen starts to diffuse in MgH₂ well below T_d. This indicates the important role of hydrogen diffusion in accelerating the desorption reaction by removing the reaction product, i.e. H₂, from the reaction system.

Sustainable Energy & Fuels

Desorption reaction in MgH₂ studied with in situ μ⁺SR

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Desorption reaction in MgH₂ studied with in situ μ⁺SR

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