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Citation: Tang Zhi-Yuan, Song Shi-Dong, Liu Jian-Hua, Pan Li-Zhu, Nan Jun-Min. Electrochemical Properties of La_1－xSr_xNi_1－yCo_yO₃ Bifunctional Oxygen Electrodes[J]. Acta Physico-Chimica Sinica, ;2003, 19(09): 785-790. doi: 10.3866/PKU.WHXB20030901 shu

Electrochemical Properties of La_1－xSr_xNi_1－yCo_yO₃ Bifunctional Oxygen Electrodes

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin　300072; Chemical Department, South China Normal University, Guangzhou　510631

Received Date: 8 January 2003
Available Online: 15 September 2003

A series of novel La1－xSrxNi1－yCoyO3（x= 0, 0.1, 0.2, 0.5； y=0～1.0）perovskite oxides were prepared by sol-gel method and characterized by XRD and XPS. The activity of bifunctional oxygen electrodes made by the perovskite-type catalyst dispersed on active carbon was investigated using electrochemical impedance spectroscopy (EIS). The impedance spectra of both cathodic and anodic polarization were analyzed. The results show that the properties of electrodes are improved by doping Co3＋ ions on B site because the concentration of B site ions on the catalysts surface are increased. But by doping Sr2＋ ions on A site could impair the effect because the ordering level of oxygen vacancy and the electrode resistance are increased. The polarization resistance is mainly caused by the slow Nernstian diffusion and charge transfer reaction and not by concentration of adsorption of oxygen species and oxygen vacancy. So it is concluded that by increasing the concentration of B site ions on perovskite oxide surface and improving the thickness of electrolyte film the performance of oxygen electrodes could by improved.
- Bifunctional oxygen electrodes;Metal-air batteries;Perovskite oxides; Electrochemical impedance spectra;Fuel cell
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沈阳化工大学材料科学与工程学院沈阳 110142

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Electrochemical Properties of La1－xSrxNi1－yCoyO3 Bifunctional Oxygen Electrodes

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Electrochemical Properties of La_1－xSr_xNi_1－yCo_yO₃ Bifunctional Oxygen Electrodes