Ye Lin

Performance of PrBaCo2O5+δ as a Proton-Conducting Solid-Oxide Fuel Cell Cathode

The potential application of PrBaCo(2)O(5+delta) (PBC) double perovskite oxide as a cathode for a proton-conducting solid-oxide fuel cell based on a BaZr(0.1)Ce(0.7)Y(0.2)O(3-delta) (BZCY) electrolyte was systematically investigated. XRD and O(2)-TPD results demonstrated that cation exchange between BZCY and PBC perovskites simultaneously occurs from the formation of Co(3+)-doped BZCY and Y(3+)-doped PBC. This event does not significantly change the cathodic polarization resistance. Under real fuel cell conditions, neither the electrolyte nor electrode resistances were significantly affected by the phase reaction and morphologic change of PBC. Anode-supported cells with an electrolyte thickness of approximately 30 microm were successfully fabricated via a dual dry pressing process. Relatively high performance of 520 and 407 mW cm(-2) at 700 degrees C was achieved for the cell with a PBC cathode fired at 950 and 1100 degrees C, respectively. A low electrode polarization resistance of 0.06 ohms cm(2) was achieved at 700 degrees C for the PBC cathode calcined at 950 degrees C.

A High Electrochemical Performance Proton Conductor Electrolyte with CO2 Tolerance

Abstract A low-temperature proton conductor electrolyte with CO 2 tolerance that had a smaller drop in performance with decreasing operation temperature was developed. A Ni-anode-supported solid oxide fuel cell (SOFC) comprising a proton-conducting BaZr 0.4 Ce 0.4 Y 0.2 O 3 (BZCY4) electrolyte and a Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 (BSCF) perovskite cathode was fabricated. An anode-supported thin-film electrolyte fuel cell was fabricated by the dual dry pressing/sintering process. A peak power density of 219 mW/cm 2 was achieved at 750 °C while it still was 57 mW/cm 2 at 400 °C when operating on humidified H 2 fuel using a cell with a 32 μm thick electrolyte.