科研之友
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摘要
In this work experimental results are presented and analyzed for catalytic platinum films of ultra-low thickness of 0.09-3.47 nm and Pt loading of 0.18-7.44 mu g cm(-2) deposited using the PLD method with an ArF excimer laser (lambda = 193 nm) at room temperature. For Pt deposited on the surface of the Nafion (R) membrane (electrolyte), in a fuel cell with PLD Pt working as oxygen cathode the peak power density is obtained equal to 59.36 mW cm(-2) for the Pt loading of 1.24 mu g cm(-2). In the case of Pt deposition on the gas-diffusion layer (as cathode), a much higher maximum power density of 10636 mW cm(-2) at the same loading and a maximum of 188.44 mW cm(-2) at the 7.44 mu g cm(-2) loading is observed. Experiments are also presented of Nafion (R) modification before the deposition of Pt on the Nafion, in which the surface of the membranes is enlarged by bombarding with Ar ions from a plasma generator of RF 13.56 MHz. The electrochemical activity of the elements prepared by PLD is assessed in a H-2/Pt/Nafion (R)/Pt/O2PEMFC. The structure and morphology of the surface layers is examined by AFM and SEM microscopy.
- 出版日期2015-1-1
