| dc.description.abstract | Operation of Reversible Solid Oxide Fuel Cells (R-SOFCs) have both power generation mode (SOFC) and energy storage mode (SOEC). SOEC electrolyzes water vapor at high temperature and stores electricity as hydrogen energy. When the times as electricity is needed, hydrogen is then converted into electricity by SOFC mode. In this way, the characteristics of intermittent power when generating electricity by renewable energy can be avoided, which may cause electricity output faults if more electricity was required at busy times. In addition, this device can be regarded as a stable and clean system as water vapor is the only by-product, which may also reduce greenhouse gas emissions.
In this study, the performance of LSCF and GCCCO as air electrode in R-SOFC, alongside with different methods of preparing interlayer, spin coating and PLD, were explored. As an air electrode, both LSCF and GCCCO has good electron and oxygen ion conductivities, and also shows good performance in R-SOFC at medium temperature. However, GCCCO can also conduct protons, which may further increase the performance of R-SOFC. Furthermore, the ohmic and polarization resistance will be further reduced by changing the preparation method of the interlayer. Hence, the maximum power density and Faradic efficiency of a single cell can be further improved. Moreover, a reliable measurement method will be established in both FC and EC mode in this study, as well as its electrochemical data analysis on different temperatures will be discussed.
This experimental study shows that the maximum power density of the GCCCO single cell prepared by PLD interlayer at 800°C in FC mode is 962.4 mW/cm2, which is 128 % higher than the LSCF single cell prepared by spin coating interlayer. Because the ohmic and polarization impedance are reduced by about 54 % and 85 % respectively. In EC mode, the GCCCO single cell prepared by PLD interlayer has a hydrogen production rate of 3.31E-06 g/s and its Faradaic efficiency of 41.5 %. In comparison, the Faradaic efficiency of LSCF single cell prepared by spin coating has only 25.7%. | en_US |