Strontium Doping Effect on High-Performance PrBa1-xSrxCo2O5+delta as a Cathode Material for IT-SOFCs

Abstract

The strontium effect in PrBa1-xSrxCo2O5+? (x = 0, 0.25, 0.5, 0.75, and 1.0) oxides was investigated based on their structural characteristics, electrical properties, and electrochemical performance. Electrical conductivities increase with increasing strontium content due to the higher oxygen content and coordination number. The area specific resistance (ASR) of PrBa1-xSrxCo2O5+? were measured on Ce0.9Gd0.1O1.95 (GDC) and the minimum ASR values were observed at x = 0.5 and 0.75. Electrochemical performance of PrBa1-xSrxCo2O5+? cathodes was measured using Ni-GDC anode-supported cell. The maximum power density was 1.08Wcm-2 at 600C for x = 0.5 and 0.75.