Preparation and hydrogen storage properties of Pd-Au nanoparticles prepared by an aqueous solution method

摘要

This paper provided the controlled synthesis of Pd-Au nanoparticles (NPs) by a facile solution method, and demonstrated the novel hydrogen storage properties of Pd NPs. The addition of a small amount of Au led to the suppression of growth in Pd NPs, making size control possible. The mean diameters of Pd and Pd-Au NPs before filtering the solutions ranged from 7.3 to 5.0 nm. The hydrogen storage phenomenon strongly depends on particle size. The amount of hydrogen absorbed in NPs under 0.1 MPa H-2 was 0.6 H Pd-1 for 10.7 nm NPs, 0.38 H Pd-1 for 9.3 nm NPs, and 0.17 H Pd-1 for 6.5 nm NPs. Also, the presence of Au may influence the hydrogen absorption of Pd NPs. The possibility of a higher hydrogen storage capacity, tuned by particle size and Au modification to Pd NPs, was proposed in the present work. (C) 2019 The Japan Society of Applied Physics