本研究使用脈衝雷射沉積法(Pulsed Laser Deposition, PLD)製備鉑奈米顆粒並應用於燃料電池觸媒層。應用在陽極端上可達到Pt使用量僅需17 μg/cm2，而電池性能在0.6 V的電流密度可以達到約1080 mA/cm2，其性能近似市面上主流之傳統塗佈製程之觸媒(Pt使用量為200 μg/cm2 )，觸媒之減量約12倍。根據相關形貌以及電化學性能之檢測，使用PLD製備的觸媒層其厚度極薄而且鉑奈米顆粒分散均勻，在電池中具有較高的利用率。而在化學耐久性方面，PLD之樣品在加速老化測試(Accelerated Degradation Test, ADT)中也具有優異的性能表現。在經過5000圈循環測試後仍保有約60 %的化學活性表面積，此結果顯示了PLD的基材選擇自由度高，可以使用具有較高石墨化的碳材做為觸媒載體，是故能夠有非常良好的話學穩定性。 而將此技術應用在製備電池的陰極觸媒層，可在Pt用量為100 μg/cm2時具有在0.6V之電流密度為1200 mA/cm2之電池性能，此表現已經與鉑擔載量為400 μg/cm2之商用觸媒幾乎一樣。根據電化學診斷，PLD所製備的觸媒可以在降低鉑擔載量的同時，仍然保有優良的觸媒活性，推論是因為由PLD建立的觸媒微結構，比起傳統的塗佈製程，更能夠建立有效的三相點，提高觸媒利用率。 ;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.
