Synthesis of La0.6Ca0.4Co0.8Ir0.2O3 perovskite for bi-functional catalysis in an alkaline electrolyte

被引:32
作者
Chang, Yun-Min [1 ]
Wu, Pu-Wei [1 ]
Wu, Cheng-Yeou [1 ]
Hsieh, Yu-Chi [1 ]
机构
[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan
关键词
Perovskite; Bi-functional electrocatalyst; Alkaline electrolyte; Oxygen reduction; Oxygen evolution; CARBON-BLACK ANODES; METHANOL FUEL-CELLS; OXYGEN EVOLUTION; WATER ELECTROLYSIS; O-2; EVOLUTION; ACID-SOLUTION; ELECTROCATALYSIS; OXIDE; NANOCAPSULES; PERFORMANCE;
D O I
10.1016/j.jpowsour.2008.12.101
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The amorphous citrate precursor method was employed to prepare perovskite of La0.6Ca0.4Co0.8Ir0.2O3 as a bi-functional electrocatalyst for oxygen reduction and evolution in an alkaline electrolyte. The X-ray diffraction pattern of the as-synthesized powders exhibited a majority phase identical to that of La0.6Ca0.4CoO3, indicating successful incorporation of Ir4(+) at the Co cation sites. Scanning Electron Microscope images demonstrated a foam-like microstructure with a surface area of 13.31 m(2) g(-1). For electrochemical characterization, the La0.6Ca0.4CO0.8Ir0.2O3 particles were supported on carbon nanocapsules (CNCs) and deposited on commercially available gas diffusion electrodes with a loading of 2.4 mg cm(-2). In current- potential polarizations, La0.6Ca0.4Co0.8Ir0.2O3/CNCs revealed more enhanced bifunctional catalytic abilities than La0.6Ca0.4CoO3/CNCs. Similar behaviors were observed in galvanostatic profiles for oxygen reduction and evolution at current densities of 50 and 100mAcm(-2) for 10 min. Moreover, notable changes from zeta potential measurements were recorded for La0.6Ca0.4Co0.08Ir0.02O3 relative to La0.06Ca0.4CoO3, In lifetime determinations, where a repeated 3 h sequence of oxygen reduction/resting/oxygen evolution/resting was imposed, La0.6Ca0.4Co0.8Ir0.2O3/CNCs delivered a stable and sustainable behavior with moderate degradation. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:1003 / 1007
页数:5
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