Effect of the thickness of carbon electrode support on the performance of PEMFC

Porous conducting carbon paper has been identified as one of the most suitable materials to be used as an electrode support in a polymer electrolyte membrane fuel cell (PEMFC). Carbon paper was prepared following a combined technique of papermaking followed by composite formation. Samples were prepared with varying thickness while maintaining a uniform composition and a constant density of 0.50 g/cc. The effect of the thickness on various properties of carbon paper affecting its performance in the PEM fuel cell and cell efficiency has been discussed. Power density as high as 805 mW/cm2 has been achieved for PEM fuel cell employing carbon paper sample with 0.028 cm thickness, an increase of more than 55% as compared to 510 mW/cm2 for 0.046 cm thick sample.

► Carbon papers with varying thickness were prepared and studied for various parameters. ► Pore connectivity within the carbon paper significantly affects fuel cell performance. ► Reduced electrical resistance and gas diffusion distance enhances PEMFC power output. ► 0.28 mm thick carbon paper exhibits max. efficiency among the studied electrodes. ► Electrode thickness plays a major role when high current is drawn from the cell.