| Summary: | 碩士 === 元智大學 === 機械工程學系 === 106 === This study is focused on modeling and experimental analysis of Solid Oxide Cells (SOCs), which is operated in reversible modes (Fuel cell mode and Electrolysis cell mode). In order to develop low operating temperature boundary condition to accommodate more excellent materials to be used in this innovation, strategies have been instituted. With the electrolysis mode, hydrogen is the main products from the splitting of water components while electricity is the main product under the fuel cell mode. A button cell in steady state condition is used for both modeling and experiment analysis. Porosity and operation temperature (600, 700, 750 and 800 °C) is regarded as the control measure for the analysis as this technology is electrochemical. The anode sintering temperatures (anode: 1300, 1400 and 1500 °C) and heating rate is varied with the cathode sintering temperature (cathode 1200°C) held constant to control the porosity of the cell components (electrodes and electrolyte) for the gas diffusion and ionic/electronic transfer. Experimental results also included the property measurements for porosity to study the cell performance. A summary of the critical values for optimum cell performance under these control measures is derived after this study. COMSOL Multiphysics is used to simulate the experimental procedures and further compare the results. Butler–Volmer equation is implemented to predict the cell current density distribution and Modified Stefan-Maxwell diffusion model incorporating Knudsen diffusion equation for multicomponent diffusion. The modeling part discusses the optimal cell porosity on effective diffusions and conductivity for SOEC mode of hydrogen production and also reversible SOEC mode for renewable energy storage and electricity production.
Keywords: Solid Oxide Cells, Electrolysis, Fuel Cell, Reversible Mode, Porosity, Sintering, Temperature, Diffusion, Conductivity.
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