甲醇燃料改質與微/奈米結構雙極板應用於μDMFC 性能之提升

Direct methanol fuel cell ( DMFC) were thought as the new generation of power supplies due to the advantages of low operation temperature, high energy density, rapid activation, safety, stability and low pollution. However, the intermediate product CO during the methanol oxidation process may cover the catalyst surface resulting in the poisoning effect, which reduces the absorption of the following methanol molecules. Therefore, this project will modify the methanol fuel with surfactants, which will enhance the wettability of the methanol fuel and increase the capacity of the CO bubbles removal on the catalyst surface, thus the capacity of the methanol oxidation will be promoted, thereby improving the power generating efficiency of the DMFC. In addition, this project will also select the porous silicon, carbon nanotubes (CNTs) and carbon paper as fuel diffusion layers and catalyst-carrying layers, and develop the chemical reduction technique of Pt-Ru binary catalyst deposition, which will replace the catalyst Pt sputtering process. Such a purpose is to increase the specific surface area of the catalyst carrying, and to improve the CO poisoning effect of catalysts. Finally, this project will use silicon as substrate to fabricate bipolar plates, which integrates microfluidic channel, diffusion layer of porous silicon, and Pt-Ru catalyst deposited CNTs carrying layer. Furthermore, the proton exchange membrane sandwiched with bipolar plates is assembled as a 2 × 2 cm2 DMFC device, and its power generation characteristics to the modified methanol fuel will be evaluated.