Abstract
We employed an amorphous citrate precursor (ACP) method to synthesize stoichiometric powders. Result from X-ray diffraction demonstrated a perovskite lattice, indicating the incorporation of at the sites. Image from the scanning electron microscope revealed a foamlike microstructure with various pores at . exhibited a higher decomposition rate in KOH solution as opposed to that of ACP-derived , which suggested an improved catalytic ability for oxygen reduction reaction (ORR). A similar behavior was observed during the ORR current–potential polarization using 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 . In galvanostatic measurements and lifetime evaluation, demonstrated steady voltage profiles with negligible degradation.
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