Microstructural and Electrochemical Study of Charge Transport and Reaction Mechanisms in Ni/YSZ Anode

被引：10

作者：

Bredikhin, Ivan ^{[1
]}

Sinitsyn, Vitaly ^{[1
]}

Aronin, Alexander ^{[1
]}

Kuritsyna, Irina ^{[1
]}

Bredikhin, Sergey ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

来源：

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2 | 2007年 / 7卷 / 01期

关键词：

D O I：

10.1149/1.2729259

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The microstructure and chemical changes in the Ni-YSZ heterojunctions were studied by scanning, transmission and high-resolution electron microscopy and X-ray diffraction. It was shown that new nano-size Ni grains are formed at Ni-YSZ interface at the cell operation. The following two stage reaction mechanism was proposed for hydrogen oxidation on the nano-size Ni grains: 1. NiO + H-2 double right arrow H2O + Ni; 2. O2-(YSZ) + Ni double right arrow NiO + 2e. This mechanism implies that the SOFC will operate during some time even after switching off the hydrogen flow. We have observed and investigated current-voltage characteristics of SOFC after cutting off the hydrogen pass through anode chamber. Electrochemical properties of SOFC were investigated as a function of Ni volume content for two different geometry of anode current collector. Good correlations of experimentally measured SOFC characteristics with results of numeric calculations were found.

引用

页码：1533 / 1540

页数：8

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