Effect of Co-Substitution on Hydrogen Absorption and Desorption Reactions of YMgNi4‑Based Alloys

• Published in: Journal of physical chemistry. C 2022-10, Vol.126 (40), p.16943-16951
• Main Authors: Sato, Toyoto, Ikeda, Kazutaka, Honda, Takashi, Daemen, Luke L., Cheng, Yongqiang, Otomo, Toshiya, Sagayama, Hajime, Ramirez−Cuesta, Anibal J., Takagi, Shigeyuki, Kono, Tatsuoki, Yang, Heena, Luo, Wen, Lombardo, Loris, Züttel, Andreas, Orimo, Shin-ichi
• Format: Article
• Language: eng ; jpn
• Subjects: C: Energy Conversion and Storage
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.2c03265

YMgNi4-based alloys exhibit reversible hydrogen absorption and desorption reactions at near room temperature. Here, we report that Co-substituted YMgNi4-based alloys exhibited higher hydrogen contents and lower hydrogen absorption and desorption reaction pressures than unsubstituted alloys. The effects of Co-substitution viewed from atomic arrangements were particularly clarified by synchrotron radiation powder X-ray diffraction, neutron diffraction, and inelastic neutron scattering. Powder neutron diffraction of the Co-substituted alloy at 5 MPa of D2 pressure suggested the formation of γ-phase deuteride (higher deuterium content) from β-phase deuteride (lower deuterium content). However, no γ-phase deuteride was observed in the unsubstituted alloys at 5 MPa. Therefore, the γ-phase deuteride formation of the Co-substituted alloy at lower pressure led to higher hydrogen contents than the unsubstituted alloys. The combined results of powder neutron diffraction and inelastic neutron scattering suggested that the γ-phase hydride of the Co-substituted alloy was continuously generated due to additional H atoms at the H atom sites in the β-phase hydride because of the disordered H atomic arrangement involving H–H interactions. As a result, hydrogen absorption and desorption reaction pressures for the γ-phase deuteride formation with higher hydrogen storage capacity were lowered.