| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 103 === Based on the former researcher&;#39;s framework in AVPSL, this study focus on improving the phenomenon of cell weeping and immediately adding fuel, in order to ameliorate the efficiency of the electrochemical reaction and the flow in the cell. To make the output of electricity of every single cell in the metal fuel cells pack more homogeneous and stable, we propose a Flow-Zinc-Particle Fuel Cell Modular Design. Focusing on the factors which can affect the performances of the cells, such as the current collector materials, the refilling mechanism of Zn particles, and the mechanism of the cell, we find out the best parameter of single cells by analyzing the I-V polarization curves and AC impedance analysis. Finally, we compare the differences in performances between the traditional plat-like metal fuel cell and the Flow-Zinc-Particle Fuel Cell Modular cell. In this research, our concept in the use of Zn particles is different from the traditional design which uses the Zn plates. Zn particles are made from 20g Zn powder and different concentrations of potassium hydroxide solution and the separator is made of nonwoven fabric. With the advantages of flowing electrolyte and independent fuel-refilling canals, not only can the cell refills fuel at any time, but also can the water, carbonate and zinc oxide generated after the reaction can flow out of the cell.
The results show that the velocity of electrolyte is fixed at 150ml/min, and the update rate of OH-concentration within the cell is better. We choose copper plates and copper meshes as current collector materials. In order to prevent the interactions between Zn and the electrolyte, we plate Au on the current collector. Copper plates have better performance on current collecting than nickel sheet under the bulk current. The use of copper plate can prevent the appearance of large quantities of H2 bubbles which are produced by the chemical interaction between nickel and Zn particles. Currently, the maximum power of single cell is 13.3w; the energy density is about 528Wh/kg; the current density is 684mA/cm2; the power density is 553.5mW/cm2; the corresponding voltage is 0.8V.
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