Catalytic effect of nanostructured Mg2Ni and YH2/YH3 on hydrogen absorption-desorption kinetics of the MgCuH system

• Mg2Cu compound with Mg2Ni and YH2/YH3 is synthesized.
• Nanostructured Mg2Ni and YH2/YH3 are distributed dispersively.
• Hydrogen ab/desorption kinetics of MgCuH system is improved by Mg2Ni and YH2/YH3.

The Mg2Cu alloy with nanostructured Mg2Ni and YH2/YH3 is synthesized by ball-milling of Mg10YNi + 4Cu (in mole ratio) powders at 4 MPa H2 followed by sintering at 400 °C for 20 h under an argon pressure of 0.6 MPa. It is found that the kinetic properties of both the disproportionation reaction of Mg2Cu and its reverse reaction can be enhanced in comparison with those of undoped Mg2Cu. The improvement of hydrogen absorption/desorption kinetics is attributed to the nanocrystalline Mg2Ni and YH2/YH3 embedded in the Mg2Cu matrix.

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