Publications by authors named "Lennard Mooij"
Article Synopsis
- Magnesium thin films topped with palladium (Pd) can absorb hydrogen at higher pressures than regular magnesium (bulk Mg), sparking debate about why this occurs.
- Initially, the explanation focused on the elastic stress from the Pd layer, while later theories proposed that alloying between Mg and Pd was the cause.
- This study clarifies the situation by examining hydrogen absorption and release in Mg-Pd thin film alloys, showing that both elastic clamping and alloying play a role, alongside the impact of plastic deformation.
Article Synopsis
- - Hydrogen plays a significant role in the transition to clean energy and is being explored for applications like hydrogen storage, catalysis, and rechargeable batteries, all of which are influenced by the thermodynamics of metal-hydrogen systems.
- - The study highlights how incorporating small amounts of zirconium into yttrium can create elastic strain in the yttrium lattice, which stabilizes during hydrogen absorption and release cycles.
- - This modification allows for a dramatic tuning of hydrogen pressure in yttrium hydride (YH) operations, enabling the development of a hydrogen sensor that visually indicates changes in ambient hydrogen pressure across a wide range.
Concentration dependence of hydrogen diffusion in clamped vanadium (0 0 1) films.
J Phys Condens Matter
February 2017
The chemical diffusion coefficient of hydrogen in a 50 nm thin film of vanadium (0 0 1) is measured as a function of concentration and temperature, well above the known phase boundaries. Arrhenius analysis of the tracer diffusion constants reveal large changes in the activation energy with concentration: from 0.10 at 0.
View Article and Find Full Text PDFNucleation and growth mechanisms of nano magnesium hydride from the hydrogen sorption kinetics.
Phys Chem Chem Phys
July 2013
We use a combination of hydrogenography and Johnson-Mehl-Avrami-Kolmogorov (JMAK) analyses to identify (1) the driving force dependence of the nucleation and growth mechanism of MgH2 in thin film multilayers of Mg (10 nm) and (2) the nucleation and growth mechanism of Mg in the earlier formed MgH2, i.e. the hydrogen desorption process.
View Article and Find Full Text PDFHysteresis and the role of nucleation and growth in the hydrogenation of Mg nanolayers.
Phys Chem Chem Phys
February 2013
We investigated the hydrogenation of 3 and 10 nm Mg layers sandwiched between Ti using an optical transmission technique (hydrogenography). We observe in situ the two dimensional nucleation and growth of single hydride domains of up to several millimeters in diameter. The low density of nuclei points to preferential nucleation at heterogeneous sites.
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