Effect of Cr addition on room temperature hydrogenation of TiFe alloys. (28th May 2021)

• Record Type: Journal Article
• Authors: Jung, Jee Yun; Lee, Sang-In; Faisal, Mohammad; Kim, Hayoung; Lee, Young-Su; Suh, Jin-Yoo; Shim, Jae-Hyeok; Huh, Joo-Youl; Cho, Young Whan
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 37(2021)
• Page Start: 19478
• Page End: 19485
• Publication Date: 2021-05-28
• Subjects: Hydrogen storage alloy -- TiFe alloy -- Activation -- Pressure–composition isotherm; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.03.096
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This paper discusses the effect of AB2 (Ti(Cr, Fe)2 ) phase on the hydrogenation properties of a Ti–Fe–Cr alloy system. Five Ti–Fe–Cr based alloys were fabricated by varying the Cr content. The microstructural analysis results revealed that the fraction of the Ti(Cr, Fe)2 phase increased with the increasing Cr content. The first hydrogenation test results indicated that all the alloys could absorb a significant amount of hydrogen at room temperature (30 °C) without a separate activation process. This behavior improved when the Ti(Cr, Fe)2 phase existed in the AB phase; the kinetics of the first hydrogenation tended to increase with the fraction of Ti(Cr, Fe)2 phase. The enhancement in the first hydrogenation kinetics of the Ti–Fe–Cr based alloys was attributed to the synergetic effect of the interface between the AB and Ti(Cr, Fe)2 phases and the inherent fast hydrogenation of the Ti(Cr, Fe)2 phase. However, the total hydrogen storage capacity decreased when the fraction of Ti(Cr, Fe)2 phase increased. Highlights: AB single phase with Cr is hydrogenated at 30 °C without activation heat treatment. Hydrogenation kinetics improves as the fraction of the AB2 phase increases. The interface between the AB and AB2 phases also improves hydrogenation kinetics.