Evaluation of the pressure dependence of the cycle durability and thermodynamics of a metal hydride compressor composed of ternary V40 and V70TiCr. (24th February 2021)

• Record Type: Journal Article
• Authors: Goshome, Kiyotaka; Endo, Naruki; Maeda, Tetsuhiko
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 14(2021)
• Page Start: 9479
• Page End: 9487
• Publication Date: 2021-02-24
• Subjects: Metal hydride -- Metal hydride hydrogen compressor -- Body-centered cubic alloys -- Vanadium-based solid-solution alloys -- Pressure-composition-isotherm; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.12.101
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, the cycle durability and thermodynamic characteristics of V40 TiCr and V70 TiCr were examined to evaluate their performance as metal hydride compressors. The cycles of incomplete hydrogen absorption under low pressure increased the hysteresis in the higher hydrogen concentration region, wherein cycling was not conducted, thereby forming an unavailable region; however, the equilibrium absorption pressure recovered after several full cycles at higher pressure. Due to the thermodynamic evaluation after 300 full cycles, V40 TiCr with 0.70, 0.53, and 0.44 of Ti/Cr ratio are expected to compress 1.2 wt% of hydrogen from 0.25 to 4.9 MPa, 1.96–22.2 MPa, and 5.97–46.8 MPa, respectively, between 40 and 150 °C. V70 TiCr with a low Ti/Cr ratio (0.33) demonstrated good cycle durability and is expected to compress 1.7 wt% of hydrogen 10 times from 5.4 to 54.8 MPa between 35 and 155 °C. Highlights: VTiCr alloys are potential materials for hydrogen compression. Cycles of incomplete hydrogen absorption forms unavailable region for VTiCr alloys. V40 TiCr can be adjusted as MH compressor over a wide pressure range. V70 TiCr with high Ti/Cr ratio shows worse cycle durability than that of V40 TiCr. V70 TiCr is more suitable for compression in high pressure region than V40 TiCr.