Effect of introducing manganese as additive on microstructure, hydrogen storage properties and rate limiting step of Ti–Cr alloy. (1st January 2022)

• Record Type: Journal Article
• Authors: Lv, Peng; Zhong, Changlin; Huang, Dongfang; Zhou, Xingsheng; Liu, Zhichen; Huang, Dejuan
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 1(2022)
• Page Start: 459
• Page End: 469
• Publication Date: 2022-01-01
• Subjects: Ti–Cr alloy -- Microstructure -- First hydrogenation properties -- Rate limiting step; XRD X-ray diffraction -- SEM Scanning electron microscope -- EDX Energy dispersive X-ray spectroscopy -- JMA Nucleation-growth-impingement model -- CV Contracting volume model -- GB Ginstling-Brounshtein model; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.10.029
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: TiCr2 with adding different amount of Mn (0, 2, 4 and 8 wt.%) alloys have been investigated. All alloys have C14-type main phase (gray color in SEM) and Ti minor phase (dark gray color in SEM). Rietveld fitting results proved that the lattice parameter a and cell volume of C14-type phase decreased with increasing Mn content. The first hydrogenation measurement manifest that all alloys have best activation properties and could be activated without any prior heat treatment and hydrogen exposure. However, introducing Mn led to the decrease of the first hydrogen absorption rate of TiCr2 alloy, which may be due to the decrease of cell volume of C14-type main phase. The first hydrogenation properties at low temperature and effect of air exposure of the alloy were discussed. The results showed that the maximum hydrogen absorption capacity at 0 °C was obviously higher than that at room temperature. In addition, TiCr2 alloy doped with minor amounts of Mn after long-time air exposure showed better hydrogenation performance. This may be due to the Mn additive acting as a deoxidizer. Finally, the first hydrogenation kinetic mechanisms of all alloys at different temperature were also studied by using the rate limiting step. Highlights: Mn was introduced to improve the activation properties of TiCr2 alloys. Alloy with Mn can be activated without any heat treatment and hydrogen exposure. Crystal structure affects hydrogen storage properties of TiCr2 alloys. First hydrogen absorption rate decreased after adding Mn. Alloy exhibits good low-temperature hydrogen absorption performance.