Synthesis and characterization of La0.6 Ca0.4 Co 0.8 Ru0.2 O3 for oxygen reduction reaction in an alkaline electrolyte

Yun Min Chang*, Yin Fang Chang, Pu-Wei Wu, Cheng Yeou Wu, Pang Lin

*Corresponding author for this work

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Abstract

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.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number6
DOIs
StatePublished - 1 Nov 2010

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