| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 104 === Pulsed laser deposition (PLD) in Ar atmosphere is used to deposit Pt nanoparticle onto gas diffusion layer (GDL), and its application in PEM fuel cell is optimized and characterized. When used at anode side, with a Pt loading of 17 μg/cm2, the current density at 0.6 V in fuel cell test reaches 1100 mA/cm2, and the performance is almost the same as the commercial product with 200 μg/cm2 Pt loading. The high performance of PLD based PEM fuel cell could be ascribed to thinner catalyst layer, good dispersion of Pt particles on GDL, and small particle sizes of 2–3 nm, which lead high utilization of catalyst in cell operating. In addition, it was found that the PLD-produced catalyst on GDL exhibits a much higher electrochemical durability than E-TEK Pt /C, which can be ascribed to the much higher degree of graphitization of GDL than carbon black. The results show that the catalyst support of PLD method can be a high degree of graphitization carbon-based support, which can dramatically increase the durability of the catalyst/support.
The cell performance of 1200 mA/cm2 was achieved by using only 100 g/cm2 Pt loading produced by PLD. The cell performance of PLD sample is almost the same as commercial catalyst with 400 μg/cm2 Pt loading. According the result of electrochemical test, the PLD-made catalyst shows a good activity with a low Pt loading, which can be ascribe to the catalyst structure produced by PLD is more closed to the ideal catalyst structure. The higher possibility of production of effective three-phase point of PLD-made structure will lead a good catalyst utilization efficiency.
|
|---|
