We present an investigation of molecular permeation of gases through nanoporous graphene membranes via molecular dynamics simulations; four different gases are investigated, namely helium, hydrogen, nitrogen, and methane. We show that in addition to the direct (gas-kinetic) flux of molecules crossing from the bulk phase on one side of the graphene to the bulk phase on the other side, for gases ...

Hydrogen is a dangerous gas due to its low ignition energy, wide flammability range, promotion of the embrittlement steel, and high coefficient permeation for polymers. The fracture toughness failure elongation pipe steels are strongly impacted by hydrogen embrittlement, whereas yield stress ultimate strength moderately impacted. Specific tools required defect assessment used transport hydrogen...

Direct liquid fuel cells (DLFCs) are proposed to address the problems of high cost and complex storage transportation hydrogen in traditional hydrogen–oxygen proton exchange membrane cells. However, present fuels organic small molecules used DLFCs restricted sluggish electrochemical kinetics easily poisoning precious metal catalysts. Herein, we demonstrate reduced phosphotungstic acid as a for ...

The permeability coefficients of a series of amides, ureas, and diols have been measured on red cells of man and dog using the minimum volume method of Sha'afi et al. When the molecules are grouped according to their ether-water partition coefficients, k(ether), the behavior of the hydrophilic molecules, with k(ether) less than water, is different from that of the lipophilic molecules, characte...

As the hydrogen society progresses, Fuel Cell Vehicles (FCVs) are rapidly becoming more widespread. Metal permeable membranes, which essential parts of fuels for polymer electrolyte fuel cells (PEFCs), require an alternative material to palladium from a cost point view. Austenitic stainless steel, is low cost, corrosion resistant, and easy prepare manufacture, has been considered unsuitable as ...

This study presents hydrogen diffusion and trapping in the nickel Alloy 625 by employing hot extraction test thermal desorption spectroscopy (TDS) analysis. Combined with electrochemical permeation test, impact of grain size boundary carbide on are investigated. The results manifeste that effective diffusivity can be expressed as D = 1.03 × 10 − 7 exp ( 46.44 k J m o l R T ) 2 / s for sample a ...

FLiNaBe is a promising liquid blanket material for fusion reactor. Since hydrogen solubility low, one concern the permeation of bred tritium. In order to increase effective hydrogen, addition Ti powder was proposed. this study, influence on behavior tritium generated inside by neutron irradiation investigated. The samples and mixed with 5 wt% 0.5 were prepared solid-state irradiated thermal neu...