抄録
More renewable energy is desirable to be used to protect global warming and exhaustion of fossil fuel. One of such alternative energy system is hydrogen energy system. One of the methods to produce hydrogen from water by renewable energy is polymer electrolyte electrolysis cell (PEEC), which is high efficient and compact with high current density. To optimize operating conditions of PEEC, experimental characteristics measured in a small sized PEEC are compared with numerical analysis. Our numerical model considers two-dimensional variation of temperature and current density along the flow direction of supplied water and perpendicular to membrane/electrodes assembly, taking account of balance equations of mass, heat and electric charge. Calculated results show that the current density and temperature distributions along water flow direction are almost uniform. To confirm the uniform current density, a segmented electrode cell was made to measure the current density. Measured current density with sufficient water supply agrees well with the numerical when cell temperature is 40-80°C, average current density is 0.5_??_2A/cm2 and water electrolyzing ratio is 2_??_5%.
