Hydrogen/deuterium storage properties of Pd nanoparticles

The Pd nanoparticles of 10 nm have been prepared by dealloying method. They can absorb/desorb hydrogen or deuterium completely in a few seconds at room temperature. There is no apparent isotope effect on the sorption kinetics. The activation energies of hydrogen and deuterium absorption are 23.2 and 23.7 kJmol−1, respectively. The diffusion coefficients of hydrogen and deuterium in the Pd nanoparticles are similar at 423 K. However, the deuterium isotherm shows higher plateau pressure and narrower gap than the hydrogen isotherm at the same temperature. When the temperature increases to 473 K, no phase transformation can be detected for both hydrogen and deuterium. The particle size and structure effects on the hydrogen/deuterium sorption process are discussed.

Graphical abstractThe Pd nanoparticles of 10 nm have been prepared by dealloying method. They can absorb/desorb hydrogen or deuterium completely in a few seconds at room temperature, and there is no apparent isotope effect on the kinetics. In addition, the diffusion coefficients of hydrogen and deuterium in the Pd nanoparticles are similar at 423 K. However, the deuterium isotherm shows higher plateau pressure and narrower gap than the hydrogen isotherm at the same temperature. The particle size and structure effects on the hydrogen/deuterium sorption process are discussed.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We prepared the Pd nanoparticles of 10 nm by dealloying method. ► They can absorb/desorb hydrogen or deuterium quickly at room temperature. ► There is no apparent isotope effect on the sorption kinetics of Pd nanoparticles. ► The diffusion coefficients of hydrogen and deuterium in Pd are similar. ► Deuterium isotherm shows higher plateau pressure and narrower gap than hydrogen.