Abstract
Disproportionation and phase separation are big issues that occur under extreme pressure and temperature conditions during hydrogen compressor cycles, which makes metal hydrides inactive and reduces compression efficiency. It is important to identify boundary conditions to avoid such unwanted phase separation. However, no investigation related to this problem has been carried out so far. Thus we propose a method to investigate the critical temperature and pressure condition for the alloy degradation during the hydrogen compressor cycle. The V20Ti32Cr48 alloy was chosen as a model system for the purpose. The influence of two important parameters (i.e., hydrogen content and temperature) was investigated individually. The disproportionation of V20Ti32Cr48 alloy during the hydrogen compressor cycle test occurred at temperatures higher than 200 °C and 75% H2 content of the total capacity at the initial condition. A clear and obvious boundary condition between disproportionation and keeping the initial phase intact is defined herein. It can be treated as a general method for any hydrogen storage alloy to be utilized for hydrogen compressor efficiently and safely.
Highlights
Hydrogen compression based on reversible thermal energy-driven interaction of hydrogen storage materials with hydrogen gas has been developed as a promising option for hydrogen energy systems [1]
The V20 Ti32 Cr48 alloy was investigated as a model system to obtain the best conditions without disproportionation and phase segregation, the method can be generalized for other systems later
The influence of temperature at the high pressure condition and hydrogen content at the initial condition were studied in order to understand the hydrogen compressor cyclic durability by changing the operation temperature and hydrogen content, respectively
Summary
Hydrogen compression based on reversible thermal energy-driven interaction of hydrogen storage materials with hydrogen gas has been developed as a promising option for hydrogen energy systems [1]. It works only by absorbing H2 via hydride forming metals and alloys at ambient temperature and releasing pure H2 when increasing the system temperature [2,3,4,5]. The vanadium based BCC-alloys have been extensively considered for metal hydride based hydrogen compressors worldwide due to their excellent features, i.e., high hydrogen storage capacity (4 wt%) and fast kinetics for hydrogen ab/desorption at ambient temperatures [1,21,22,23,24,25,26,27]
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