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Citation: Wang Shi-Zhong, Jiang Yi, Li Wen-Zhao, Yan Jing-Wang. Kinetics of Electrochemical Reduction of Oxygen on the La_0.8Sr_0.2MnO₃/YSZ Electrode[J]. Acta Physico-Chimica Sinica, ;1997, 13(08): 717-724. doi: 10.3866/PKU.WHXB19970808 shu

Kinetics of Electrochemical Reduction of Oxygen on the La_0.8Sr_0.2MnO₃/YSZ Electrode

1.
Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023

Received Date: 24 December 1996
Available Online: 15 August 1997

Electrochemical reduction of oxygen on the La0.8Sr0.2MnO3/YSZ electrode has been investigated in detail with methods of Low Field Polarization , Cyclic Voltammetry and Potential Step. The results demonstrate that the reduction of oxygen on the LSM+YSZ cathode takes place through two pathways: at low temperatures oxygen reduction takes place at Three Phase Boundary (TPB), in which case the rate determining step is the diffusion of atomic oxygen from the LSM surface to TPB, while at high temperatures the reaction area extends over the whole surface of the LSM electrode and the rate determining step is the charge transfer step. It has also been found that the formation of oxygen vacancy is affected by reaction temperature, oxygen pressure and cathodic potential applied. Oxygen vacancy plays an important role in the electrochemical reduction of oxygen at high temperatures and high oxygen partial pressures.
- Strontinum doped lanthanum manganite,
- Electrochemical reduction of oxygen,
- Solid oxide fuel cell,
- Oxygen vacancy
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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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Kinetics of Electrochemical Reduction of Oxygen on the La0.8Sr0.2MnO3/YSZ Electrode

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Kinetics of Electrochemical Reduction of Oxygen on the La_0.8Sr_0.2MnO₃/YSZ Electrode