| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Research Abstract |
In this study, the cell characteristics of fuel cell and water electrolysis cell was quantitatively obtained by a manufacture of small simple cell using solid polymer film of 10 cm^2 electrode surface area, changing the cell temperature from room temperature to 80ﾟC, adjusting the current density to be about 1 A/cm^2, making the fuel and oxidizing agent utilization rate and water electrolysis rate to be operating parameters. The two-dimensional numerical code considering a balance of mass and energy, electric charge was produced in order to analyze the experimental result. However, the activation and resistance overvoltage, and the electroosmosis coefficient were experimentally required. In the analysis of the fuel cell, the steam in the fuel electrode side moved to the oxidizing agent side with proton transfer, and the steam in the fuel electrode side decreased, and the polymer membrane dried, and the ionic conductivity and the current density decreased. In the downstream, the steam concentration in the oxidizing agent side increased, and became the saturation state, and the steam did the back-diffusion to the fuel electrode side, and the film uniformly got wet and the current density became to be constant. In the analysis of electrolysis of water, the water vaporization and entropy heat flowed to the power collection board of constant temperature, and the temperature of whole film, the Nernst electromotive force and the current density became to be constant in the flow direction in contrast to the fuel cell, as long as there was no shortage of the water for the electrolytic. The current density distribution was measured by way of a split electrode cell in order to confirm the analysis results. Except for the region of which current density was big, the analytical and measured result agreed well.
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