Influence of Nanoxides on Diffusivity and Solubility of Hydrogen in Pd-based alloys

Abstract

The hydrogen interaction in palladium alloys with addition of Ce, Zr and Y was studied. These alloys are produced by arc-melting and then cold rolled into thin foils. Heat treatment at 800ºC for 24h in air atmosphere is applied to induce internal oxidation. Hydrogen permeation tests and TDS (Thermal Desorption Spectroscopy) are carried out to evaluate hydrogen interaction with three different microstructures which can be characterized by dislocations, substitutional atoms and nanoxides. For alloys argon annealed, Ce is the element that delays the most hydrogen diffusion, followed by Zr and Y. However alloys with yttrium nanoxides exhibit the highest solubility and the smallest diffusivity due to their small size, spherical shape and dispersion throughout the matrix. Analyzing TDS curves, it is shown that nanoxides are irreversible traps that improve hydrogen stored on palladium alloys. Dislocations and impurity atom on solid solution have little binding energy that detraps hydrogen at smaller temperatures.

Hydrogenated Cs2AgBiBr6 for High-Efficient Lead-Free Inorganic Double Perovskite Solar Cell

“…However, due to the uncertainty of the diffusion coefficient of H * in Cs2AgBiBr6, it is hard to predict quantitatively the H * distribution concentration in perovskite film. The diffusion coefficient of H * in most materials ranges from 4.910 -15 cm 2 /s to 1.0710 -5 cm 2 /s (Supplementary Table 2) [35][36][37][38][39][40][41][42] . So here, to estimate the diffusion coefficient, we first simulated the depth-dependent values at different hydrogenation times (600 s, 1,200 s, 1,800 s, 2,400 s and 3,000 s) based on the selected diffusion coefficients from 110 -15 cm 2 /s to 110 -5 cm 2 /s, as shown in Supplementary…”