Evaluation of a BCC alloy as metal hydride compressor via 100 MPa-class high-pressure hydrogen apparatus

In the study presented here, an apparatus that correctly measured pressure-composition isotherms (PCi) at high pressures (up to 100 MPa) and temperatures (up to 200 degrees C) was developed. The PCi characteristics of a vanadium-titanium-chromium alloy at high pressure and temperature were examined with the apparatus to develop a metal hydride (MH) compressor. It was revealed that it is possible to use a 40 V-20Ti-40Cr (at%) alloy with a heat source below 200 degrees C for hydrogen compression in the approximate range of 2.1-30.0 MPa. The compressed content reached approximately 1.8 wt%, which is almost the same as the reversible hydrogen capacity at 20 degrees C. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.