Abstract
Metal-hydride compressors are considered as an alternative to mechanical compressors in Hydrogen Refueling Stations. In this paper, several Ti-based AB2 compounds were synthesized and their hydrogen sorption properties were evaluated under ultra-high pressure up to 40 MPa. All the studied compounds exhibit absorption plateau pressure close to or higher than 10 MPa at 30 °C. The substitution by a small amount of Al was shown to drastically decrease the hysteresis. All the compounds herein studied follow the trend ln(P)∝−V0, except for the Nb-containing compound. This compound has a different behavior towards hydrogenation and exhibits sorption pressure much higher than expected from the above-mentioned relationship. It was confirmed that the Al and Nb substitution in AB2 compounds plays a great role on reducing hysteresis and increasing the sorption pressure, respectively.
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