Interactions between Hydrogen and Palladium Nanoparticles: Resolving Adsorption and Absorption Contributions

Despite the apparent simplicity of palladium hydride systems, interactions between hydrogen and are multifaceted. Electrochemical stripping allows measuring stoichiometric coefficient atoms inside PdHx structures, whose properties greatly depend on x. In this paper, insertion H into Pd nanoparticles has been studied in a three-electrode setup (RDE) proton pump cell. An original way modelling desorption curve is proposed, helping separation absorption from other contributions. The loading voltage exhibits highest impact Pd, reaching Habs/Pd up to 0.47±0.02 RDE setup, at −0.2 VRHE. Conversely, duration presents only little influence very first seconds. Finally, maximal ratios measured around 30–40 °C, likely due an optimal balance adsorption rate, diffusion rate Pd.