We employed an amorphous citrate precursor (ACP) method to synthesize stoichiometric La0.6 Ca0.4 Co0.8 Ru 0.2 O3 powders. Result from X-ray diffraction demonstrated a perovskite La0.6 Ca0.4 CoO3 lattice, indicating the incorporation of Ru3+ at the Co3+ sites. Image from the scanning electron microscope revealed a foamlike microstructure with various pores at 0.5-3 μm. La0.6 Ca0.4 Co 0.8 Ru0.2 O3 exhibited a higher H2 O2 decomposition rate in KOH solution as opposed to that of ACP-derived La0.6 Ca0.4 CoO3, which suggested an improved catalytic ability for oxygen reduction reaction (ORR). A similar behavior was observed during the ORR current-potential polarization using La0.6 Ca0.4 Co0.8 Ru0.2 O 3 supported on Black Pearl 2000 as a gas diffusion electrode. In addition, impedance spectra at the open-circuit voltage and selective cathodic overpotentials also confirmed a smaller charge-transfer resistance for La 0.6 Ca0.4 Co0.8 Ru0.2 O3. In galvanostatic measurements and lifetime evaluation, La0.6 Ca 0.4 Co0.8 Ru0.2 O3 demonstrated steady voltage profiles with negligible degradation.