diffusion in solidssilicon compounds/ annealing atmospherediffusion coefficienttemperature dependencesingle-activation-energy exponential ruleSiO 2:BH 2 atmosphere / A6630J Diffusion, migration, and displacement of impurities in solids/ SiO2:B/ss SiO2/ss O2/ss Si/ss B/ss O/ss SiO2/bin O2/bin Si...
Diffusion coefficient m2 s−1 0.61 Specific heat kJ kg−1 K−1 (J g−1 K−1) 14.89 The most common way of storing hydrogen is in high-pressure cylinders. Typical storage pressures are between 200–450 bars (3000 or 6600 psi), and even 690 bar (10,000psi) has been reported...
The Knudsen diffusion model demonstrates the movement of Si atoms into the storage matrix (D = the diffusion coefficient for the mobility of hydrogen atoms on the Si surface) and is dominated by the molecular wall collision [369]. The Coefficient D is expressed by equation (17), where Ve ...
Hydrogen (H2) is a clean and versatile energy source to mitigate future energy crises. As a result, it has also been regarded as the ‘fuel of the future’ and global research is focused on identifying diverse H2sources and designing economically viable production processes. However, many challe...
In this case, the hydrogen diffusion coefficient DH log i = log 6FDH da2 (C0 − C s ) − π 2DH 2.303a2 t (3) where i, d, the initial hay, dCr0o, gCes,nt are the anodic concentration current density, in the alloy, the the alloy density, ...
The solubility in the form of hydrogen molecules estimated by the permeability and diffusion coefficient values was two orders of magnitude smaller than that of hydrogen dissolved in the form of hydroxyl radicals. The migration rate of the hydrogen in the form of hydroxyl radicals is far smaller ...
These data are reasonably attributed to the high diffusion coefficient of p-xylene in the S-1 zeolite micropores, which is about 100–1,000 times higher than those of o- and m-xylene47. The significantly distinguishable diffusion causes the overwhelming advantage of p-xylene in the competitive...
The effective diffusion coefficient for hydrogen in water-saturates caprock is estimated as 3.0 × 10−11 m2s−1, meaning that substantial diffusion over the storage period is unlikely. The potential for specific mineral reactions within underground hydrogen storage (UHS) largely depends on the ...
7b). For instance, the diffusion coefficient of CO2 was evaluated to be around 10−5 cm2 s−1 in a molten alkali carbonate at 800 °C and 10−14-10−17 cm2/s in a solid carbonate in the 390–725 °C range [80,81]. This can have a positive impact on the reduction step...
of a gas sensor; the gas sensor does not appear to be a metal-insulator-semiconductor sensor. The gas diffusion barrier is stated to allow selectively permeable diffusion of molecular hydrogen gas or atomic hydrogen gas. There remains a need in the art for MIS sensors having improved hydrogen ...