Single phase (Pr_1-xNd_x)₂NiO₄ powders (x=0, 0.25, 0.50, 0.75, 1) were synthesized via glycine-nitrate combustion process. Rietveld refinement shows that the unit cell volume decreases linearly with an increase of x. This volume contraction is mainly driven by a decrease in c parameter which follows Vegard’s Law. Reproducible performance was obtained for each cathode composition providing the wealth of data for quantitative studies. The overall cell performance decreases with an increase in Nd content between 650 and 850 °C, based on analysis of area specific resistance and i-E measurements. Performance stability was studied at 750 °C and 0.8 V. In comparison to the parent compound Pr₂NiO4, the total polarization increases by 29% in (Pr_0.5Nd_0.5)₂NiO₄ and by twofold in (Pr_0.25Nd_0.75)₂NiO₄. Although exhibiting the highest peak performance, Pr₂NiO₄-based cells show 4% performance degradation within 500 hours, while the degradation is negligible in other compositions. Dynamic dependency of EIS spectra, as function of current density, is in agreement with dc measurements.