Electrochemical Property Assessment of Pr2CuO4 Submicrofiber Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Abstract

The Pr2CuO4 (PCO) submicrofiber precursors are prepared by electrospinning technique and the thermodecomposition procedures are characterized by thermal gravity (TG), Xray diffraction (XRD), Fourier transform infrared spectoscopy (FTIR), and scanning electron microscopy (SEM), respectively. The fibrous PCO material was formed by sintering the precursors at 900 آ°C for 5 hrs. The highly porous PCO submicrofiber cathode forms good contact with the Ce0.9Gd0.1O1.95 (CGO) electrolyte after heattreated at 900 آ°C for 2 hrs. The performance of PCO submicrofiber cathode is comparably studied with the powder counterpart at various temperatures. The porous microstructure of the submicrofiber cathode effectively increases the threephase boundary (TPB), which promotes the surface oxygen diffusion and/or adsorption process on the cathode. The PCO submicrofiber cathode exhibits an area specific resistance (ASR) of 0.38 خ© cm2 at 700 آ°C in air, which is 30% less than the PCO powder cathode. The charge transfer process is the rate limiting step of the oxygen reduction reaction (ORR) on the submicrofiber cathode. The maximum power densities of the electrolytesupport single cell PCO|CGO|NiOCGO reach 149 and 74.5 mW cm−2 at 800 and 700 آ°C, respectively. The preliminary results indicate that the PCO submicrofiber can be considered as potential cathode for intermediate temperature solid fuel cells (ITSOFCs).