Investigation of hydrogen storage properties of magnesium based composites withaddition of activated carbon derived from apricot stones

摘要

Hydrogen absorption/desorption characteristics of the 95% Mg-5% activated carbon derived from apricot stones(ACA), 90% Mg-10% ACA and 85%-15% ACA, prepared by ball milling under argon, are studied. Hydriding processis proceeded at T = 573 K and 473 K and P = 1 MPa and dehydriding at T = 623 K and P = 0.15 MPa. The highesthydrogen absorption capacity of 6.13% is reached by the 95% Mg-5% ACA at 573 K and 1 MPa. The 90% Mg-10%ACA and 85% Mg-15% ACA reached 5.36% and 5.21% hydrogen absorption capacity, respectively. The absorptioncurves at T = 573 K and P = 1 MPa for the composites with 10 and 15% ACA are very similar. The threefold increaseof the quantity of the activated carbon in magnesium does not affect substantially the desorption kinetics of thecomposites.