Impedance Behavior of SOFC at High Fuel Utilization and a Way of Evaluating Diffusion Contribution

被引：3

作者：

Momma, A. ^{[1
]}

Tanaka, Y. ^{[1
]}

Takano, K. ^{[1
]}

Kato, T. ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Energy Technol Res Inst, 1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan

来源：

SOLID OXIDE FUEL CELLS 12 (SOFC XII) | 2011年 / 35卷 / 01期

关键词：

DISK-TYPE SOFC;

D O I：

10.1149/1.3570043

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A quantitative evaluation method of gas diffusion resistance is proposed in which measurement of V-I characteristics under constant fuel utilization (U-f) and ac impedance were combined to separate diffusion and electromotive force (emf) change contributions from the low frequency semi-circle observed in complex impedance diagrams. Diffusion resistance was evaluated using various hydrogen content mixtures diluted with nitrogen, U-f, hydrogen flow rate and current as parameters. From the measurement under various U-f, it was found that the diffusion resistance at low U-f originates mainly from the diffusion of H2O. Also, from the measurement under various hydrogen concentrations in inlet fuel, the diffusion resistance was found to become significantly larger with decreasing hydrogen content.

引用

页码：647 / 656

页数：10

共 8 条

[1]

Hendriksen PV, 2003, ELEC SOC S, V2003, P1147

[2] Impedance analysis of a disk-type SOFC using doped lanthanum gallate under power generation [J].