| Summary: | 碩士 === 逢甲大學 === 材料科學所 === 97 === We employed sodium tetrahydridoborate (NaBH4) reduction method to nanoscaled PtRu/C catalysts for direct methanol fuel cell (DMFC) applications. The catalytic activity of PtRu/C nanocatalysts is determined by process parameters and acidity conditions of synthetic route. The composite material consisted of microporous layers and catalytic layers for DMFCs were produced by electrophoretic deposition (EPD) technique. A digital programmer/recorder was used during EPD process for in-situ monitoring of the applied voltage and deposition time to produce uniformly deposited catalyst layer on the carbon textile as gas diffusion layer of DMFC. The results how that fine PtRu catalysts with favorably small size of 2~3 nm and better catalytic properties were synthesized at 30oC and pH = 5 during the reduction process.
The microporous layers by EPD method can greatly improve the water management capability for fuel cells. The microporous layers made of carbon nanotubes (CNTs) could reach maximum current density of 136 mA/cm2 directly from DMFC single cell testing. In addition, the activated carbon supports for nanocatalysts, which were treated by sulfuric acid as surface modification agent, gave rise to better catalytic activity and a current density of 130 mA/cm2 by DMFC single cell testing was reached. The carbon textile as gas diffusion layer (GDL), which was treated by plasma surface modification, was inclined to be hydrophilic for the current density of DMFC was 54 mA/cm2�|
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