Hydrogen absorption properties of Mg2Ni alloy with excess Mg synthesized by wet milling in toluene without annealing

Abstract The hydriding/dehydriding properties of Mg 2 Ni alloy with excess Mg synthesized by wet ball milling in toluene have been investigated. The appearance of a particle surface after different milling methods is one obvious difference. The synthesis time must be at least 30 h to form intermetallic Mg 2 Ni by wet ball milling in toluene. The intermetallic Mg 2 Ni compound can be formed directly without annealing to recover from the amorphous phase, as reported in previous literature. The minimum hydrogen absorption/desorption pressure is 0.2 atm for the hydriding reaction and 0.3 atm for the dehydriding reaction at a temperature of 200 °C to obtain the maximum 3.5 wt% hydrogen content in toluene wet milling.