PrBaFe₂O_5+δ (PBF) is one of the most promising cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC). Although PBF possesses similar area specific resistance (ASR) to that of Co-based cathode materials, electronic conductivity of PBF is an order of magnitude lower. Up to now, various doping strategies have been reported to enhance the electrochemical performance of this material, but still leaving it an open issue. In this study, PBF and Pr_1+xBa_1-xFe₂O_5+δ (PBF_x, x=0.01, 0.02, and 0.04) materials were synthesized by replacing Ba in PBF with excessive Pr using a Sol-Gel method, and their electrochemical performances as IT-SOFC cathodes were evaluated. For x=0.01, excessive Pr enters the lattice interstitials of PBF. For x≥0.02, 0.01 (in molar) excessive Pr occupies interstitial sites, while the rest replaces Ba in PBF. Over the temperature range of 650-800 ℃, excessive Pr promotes the conductivity of PBF, and PBF_0.01 exhibits the highest conductivity of 109.21 S•cm^-1, improving by 76%, which is attributed to the reduction in electronic transport path length. Furthermore, the excessive Pr contributes to lattice stress and dislocation density, reducing oxygen reduction reaction (ORR) activity and slightly increasing ASR of the cathode. Compared to PBF device, the peak power density of the Ni-SDC|SDC|PBF_0.01 (SDC: Sm_0.2Ce_0.8O_2-δ) single cell increased by approximately 49%, indicating that excessive Pr can significantly improve the electrochemical performance of cathode materials.