Browsing by Author "Chang, Yin-Fang"

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Synthesis and Characterization of La(0.6)Ca(0.4)Co(0.8)Ru(0.2)O(3) for Oxygen Reduction Reaction in an Alkaline Electrolyte
(2010-01-01)
Chang, Yun-Min
;
Chang, Yin-Fang
;
Wu, Pu-Wei
;
Wu, Cheng-Yeou
;
Lin, Pang
We employed an amorphous citrate precursor (ACP) method to synthesize stoichiometric La(0.6)Ca(0.4)Co(0.8)Ru(0.2)O(3) powders. Result from X-ray diffraction demonstrated a perovskite La(0.6)Ca(0.4)CoO(3) lattice, indicating the incorporation of Ru(3+) at the Co(3+) sites. Image from the scanning electron microscope revealed a foamlike microstructure with various pores at 0.5-3 mu m. La(0.6)Ca(0.4)Co(0.8)Ru(0.2)O(3) exhibited a higher H(2)O(2) decomposition rate in KOH solution as opposed to that of ACP-derived La(0.6)Ca(0.4)CoO(3), which suggested an improved catalytic ability for oxygen reduction reaction (ORR). A similar behavior was observed during the ORR current-potential polarization using La(0.6)Ca(0.4)Co(0.8)Ru(0.2)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)Ca(0.4)Co(0.8)Ru(0.2)O(3). In galvanostatic measurements and lifetime evaluation, La(0.6)Ca(0.4)Co(0.8)Ru(0.2)O(3) demonstrated steady voltage profiles with negligible degradation. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3384665] All rights reserved.
Synthesis and Characterization of La0.6Ca0.4Co0.8Ru0.2O3 for Oxygen Reduction Reaction in an Alkaline Electrolyte
(2010-01-01)
Chang, Yun-Min
;
Chang, Yin-Fang
;
Wu, Pu-Wei
;
Wu, Cheng-Yeou
;
Lin, Pang
We employed an amorphous citrate precursor (ACP) method to synthesize stoichiometric La0.6Ca0.4Co0.8Ru0.2O3 powders. Result from X-ray diffraction demonstrated a perovskite La0.6Ca0.4CoO3 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 mu m. La0.6Ca0.4Co0.8Ru0.2O3 exhibited a higher H2O2 decomposition rate in KOH solution as opposed to that of ACP-derived La0.6Ca0.4CoO3, which suggested an improved catalytic ability for oxygen reduction reaction (ORR). A similar behavior was observed during the ORR current-potential polarization using La0.6Ca0.4Co0.8Ru0.2O3 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 La0.6Ca0.4Co0.8Ru0.2O3. In galvanostatic measurements and lifetime evaluation, La0.6Ca0.4Co0.8Ru0.2O3 demonstrated steady voltage profiles with negligible degradation. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3384665] All rights reserved.