Identification of hydrogen permeability and thermal desorption parameters of vanadium-based membrane

The paper implements a two-stage penetration thorn thermal desorption experiment for the complex estimation of hydrogen permeability and thermal desorption parameters (sorption, dissolution, diffusion and desorption) of vanadium-based membrane. A gradual growth of the thermal desorption flux at high temperature is interpreted as a lowering of the potential surface barrier (primarily due to the loss of oxides). Indirect evidence of that is the stability of the critical temperature. Effectively, this entails a reduction of the desorption activation energy. The obtained effective values of the physicochemical parameters describe a series of experimental curves (at different initial sample temperatures, different molecular hydrogen input pressures, different heating rates at the TDS stage) and allow modeling numerically the penetration and thermal desorption across a wide range of conditions (including experimentally difficult ones) and estimating quantitatively the spectrum's reaction to variation of the limiting factors. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study implemented a two-stage penetration thorn thermal desorption experiment to estimate the hydrogen permeability and thermal desorption parameters of vanadium-based membrane. The gradual growth of thermal desorption flux at high temperature is interpreted as a reduction of the desorption activation energy. The obtained effective values of physicochemical parameters allow for numerical modeling of penetration and thermal desorption, and quantitative evaluation of the spectrum's reaction to variation of limiting factors.