One-pot preparation of Pd–Pt alloy nanoparticles and their hydrogen gas interaction

Abstract

This paper provided a simple preparation method of Pd–Pt solid solution nanoparticles (NPs) and demonstrated their hydrogen storage properties. The mixture of Pt and Pd precursors led to the formation of a solid solution in the system of Pd–Pt by the present one-pot solution method. A series of alloy NPs were characterized by X-ray diffraction, transmission electron microscopy and X-ray absorption fine structure measurement. The mean diameters of Pd and Pd–Pt nanoparticles in aqueous solution were ca.4 nm. The atomic ratio of hydrogen per metal at 0.1 MPa H2 was 0.2 (Pd), 0.08 (Pd0.75Pt0.25), 0.07 (Pd0.7Pt0.3) and 0.04 (Pd0.65Pt0.35). The hydrogen storage phenomenon strongly depends on alloying Pt to Pd, and hydrogen per metal extremely decreased by adding Pt to Pd in solid solution NPs.

Preparation and hydrogen storage properties of Pd1-x Ag x (x=0–0.29) alloy nanoparticles by a solution reduction method

“…The isothermal hydrogen absorption measurement was applied by the confirmed technique as in a modified system with Pd particles. 25,26) We found the formation of the solid solution NPs between Pd and Ag with 7-9 nm in diameter and that the amount and isotherms of hydrogen storage showed no typical PCT curve.…”

The dependence of hydrogen storage properties on the sizes of Pd nanoparticles prepared by a solution-reduction method

“…The initial concentrations of Pd(NO 3 ) 2 adopted were 2, 5, 10 and 15 mM using the same procedure and apparatus as used in the previous studies of Pd-based NP formation. [23][24][25] The solution mixture was then heated at 60 °C for 24 h with stirring. The system was naturally cooled to room temperature, and the precipitates were separated from the solution by centrifugation.…”