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Lithium-air batteries have attracted extensive attention in the general energy field. To enhance the practical applicability of lithium-air batteries, the overpotential caused by the diffusion of oxygen in the cathode, a significant component of the total overpotential, should be well comprehended. In this work, a wetted model is derived to evaluate the energy loss associated with liquid electrolytes...
Slow gas diffusion limits mass transfer and is detrimental in various device applications, such as fuel cells, batteries, membrane engineering, and catalysis. In fuel cells, the gas diffusion coefficient, called the diffusivity, correlates with the concentration polarization (CP) energy loss and such important parameters associated with electrode materials as porosity and tortuosity. Although three...
Limiting current densities for solid oxide fuel cells were measured using both button cells and a flow-through cell. The cell anodes were supplied with mixtures of humidified hydrogen and various inert gasses. It was demonstrated that the true limiting current in flow-through cells is reached when either: the hydrogen is nearly or completely depleted at the anode-electrolyte interface near the outlet;...
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