Synthesis And Properties Of Cgo-based Single-chamber Solid Oxide Fuel Cell Related Materials

Single Chamber Solid Oxide Fuel Cells (SCSOFC) has become one of the most attractive thesises for its unique properties of compact structure, simple fabrication and non-catalyst poison. As we known, the electrochemical properties of electrolyte and electrode have great influence on the cell output. So it is important to study in detail the preparation and electrochemical properties of relevant materials used in SCSOFC.In this paper, Citrate/nitrate combustion method was employed to synthesize (Ce_1-xM_x)_0.9Gd_0.1O_2-δ(M=Ca, Sr, Ba) electrolytes and Cu/Ni-GDC, Ni-GDC and Cu-GDC anode materials. The composite cathode is prepared by milling CGO and La₂NiO₄ powders at a certain quantity proportion. The characterizations of materials have been completed by XRD, Raman, SEM and IR techniques, respectively. The electrochemical property of synthesized materials is investigated by EIS analyzer. The results show that the ceramic doped with Ca cations, (Ce_0.9Ca_0.1)_0.9Gd_0.1O_1.86, has the best electrochemical performance in all of the doped ceria, which were tested under the same conditions. Cu/Ni-CGO anode materials exhibited superiority over Cu-CGO and Ni-CGO when tested under mixed methane and air atmospheres. With increasing the content of CGO, the performance of composite cathode got even worse than La₂NiO₄, due to the bad contact formed between the CGO electrolyte and the composite cathode materials. Furthermore, all materials studied in this paper had improved chemical stability and thermal stability.