A novel approach to pulsed laser deposition of platinum catalyst on carbon particles for use in polymer electrolyte membrane fuel cells

The research undertaken aimed to develop an efficient Pt-based catalyst for polymer electrolyte membrane fuel cells (PEMFCs) by using a cost-effective and efficient physical method to deposit platinum nanoparticles (PtNPs) on carbon supports directly from the platinum target. The method developed avoids the chemical functionalization of the carbon substrate and the chemical synthesis of PtNPs during catalyst fabrication. Platinum was deposited on carbon particles at room temperature using a pulsed laser deposition (PLD) system equipped with an ArF excimer laser (lambda = 193 nm). The uniform deposition of PtNPs on carbon supports was achieved thanks to a specially designed electromechanical system that mixed the carbon support particles during platinum deposi-tion. In the studies, Vulcan XC-72R carbon black powder, a popular material used as support in the anodes and cathodes of PEMFCs, and a porous carbon material with a high degree of graphitization were used as carbon supports. The best electrochemi-cal measurement results were obtained for Pt deposited on Vulcan XC-72R. The peak power density measured for this material in a membrane electrode assembly (MEA) of a PEMFC (fed with H-2/Air) was 0.41 W/cm2, which is a good result compared to 0.57 W/cm2 obtained for commercial 20% Pt Vulcan XC-72R. This result was achieved with three times less Pt catalyst on the car -bon support compared to the commercial catalyst, which means that a higher catalyst utilization factor was achieved.

Automated summary

The research aimed to develop an efficient Pt-based catalyst for PEMFCs by directly depositing PtNPs on carbon supports from the platinum target using a cost-effective and efficient physical method. The Pt deposition was achieved at room temperature using a pulsed laser deposition system equipped with an ArF excimer laser. The specially designed electromechanical system ensured uniform deposition of PtNPs on carbon supports. The best electrochemical performance was observed for Pt deposited on Vulcan XC-72R carbon black powder, with a peak power density of 0.41 W/cm2 in a H-2/Air fed PEMFC, which achieved a higher catalyst utilization factor compared to the commercial catalyst.