The support layer is often an anode composite plate for planar SOFCs and a cathode composite tube for tubular SOFCs. SOFC electrodes are commonly produced in two layers an anode or cathode functional layer (AFL or CFL), and a current collector layer that can also serve as a mechanical or structural support layer or gas diffusion layer. (2002) Effect of Carbon Powder Characteristics in the Cathode Gas Diffusion Layer on the Performance of Polymer Electrolyte Fuel Cells, J. Oxygen domain includes cathode channel, cathode gas diffusion layer, and cathode catalyst layer, with no boundary conditions required at the interfaces between these layers. Ī tri-layer PEMFC consisting of a PEM sandwiched between anode and cathode gas diffusion layer electrodes is shown in Figure 9.6. Water agglomerations were visuaUzed in each section. Section A is located in the flow field structure, whereas sections B-D represent sUces in the gas diffusion layer substrate (left). įIGURE 3.24 Sketch with slide positions of a cathodic gas diffusion layer. The simulations indicated that liquid water transport at the cathode is controlled by the fi action of hydrophilic surface and the average pore diameter in the cathode gas-diffusion layer.
Park and Popov (2009) studied the effect of hydrophobic and structural properties of a single or dual cathode gas diffusion layer on mass transport in PEMFCs using an analytical expression. The oxygen pressure in the CCL, which is different from that in the channel due to the pressure drop across the cathode gas diffusion layer, is roughly estimated by Pick s law as. Effects of the carbon powder characteristics in the cathode gas diffusion layer on the performance of poljmier electrolj te fuel cells. Schematic diagram of a dual-layer cathode gas diffusion layer.Īntolini E, Passos RR, TicianeUi EA. Ohmic overpotential distribution in the anode and cathode gas diffusion layers for three different nominal current densities 0.3 AJcrn (upper) 0.7 AJcrn (middle) 1.2 AJcrn (lower).įigure 19.1. Journal of Applied Electrochemistry 32 (2002) 383-388.
Effects of the cathode gas diffusion layer characteristics on the performance of polymer electrolyte fuel cells. Effect of cathode gas diffusion layer on water transport and cell performance in direct methanol fuel cells.
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