AC-IMPEDANCE STUDY OF THE OXYGEN REDUCTION-MECHANISM ON LA1-XSRXMNO3 IN SOLID OXIDE FUEL-CELLS

被引：134

作者：

OSTERGARD, MJL

MOGENSEN, M

机构：

[1] Risø National Laboratory, Materials Department, DK-4000 Roskilde

来源：

ELECTROCHIMICA ACTA | 1993年 / 38卷 / 14期

关键词：

LANTHANUM STRONTIUM MANGANITE; OXYGEN REDUCTION; IMPEDANCE SPECTROSCOPY; ELECTROCHEMICAL KINETICS; NONLINEAR LEAST SQUARES FIT; SOLID OXIDE FUEL CELL;

D O I：

10.1016/0013-4686(93)80334-V

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The kinetics of the oxygen reduction reaction at the La0.85Sr0.15MnO3/ZrO2-Y2O3 electrode has been studied by ac impedance spectroscopy. The results show that there are three time constants present in the system, each one corresponding to a rate limiting step of the total reaction mechanism. The time constant at high frequencies has been attributed to the charge transfer of oxide ions from the interface electrode/electrolyte to oxide ion vacancies in the electrolyte. The two other time constants, at medium frequencies and low frequencies, have been attributed to O-2(2-) dissociation and diffusion steps, respectively.

引用

页码：2015 / 2020

页数：6

共 11 条

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