Abstract
Herein praseodymium-deficient Pr1.90−xCe0.1CuO4 oxides are evaluated as potential oxygen electrodes for solid oxide fuel cells (SOFCs). Introducing Pr-deficiency promotes the oxygen vacancy concentration, further improving electrocatalytic activity of the Pr1.90−xCe0.1CuO4 electrodes towards oxygen reduction reaction (ORR). The Pr1.75Ce0·.1CuO4 (P1·75CC) component exhibits outstanding electrode performance, as supported by a polarization resistance as low as 0.025 Ω cm2 and high peak power density of the single cell (1.11 W cm−2) at 700 °C. In addition, the rate-limiting steps for ORR kinetics are determined to be the charge transfer reaction and oxygen adsorption/diffusion process on the electrode surface. This work highlights an effective way for developing the cathode candidates with high electrocatalytic activity and superior stability.
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