Study on component interface evolution of a solid oxide fuel cell stack after long term operation

JOURNAL OF POWER SOURCES

卷:387

Article

Yang, Jiajun¹  Huang, Wei¹  Wang, Xiaochun¹  Li, Jun¹  Yan, Dong¹  Pu, Jian¹  Chi, Bo¹  Li, Jian¹ 

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Ctr Fuel Cell Innovat, Wuhan 430074, Hubei, Peoples R China

关键词: SOFC stack;    Long-term test;    Degradation;    Interconnect oxidation;    Interface resistance;   

DOI  :  10.1016/j.jpowsour.2018.03.040

来源: Elsevier

【 摘 要 】

A 5-cell solid oxide fuel cell (SOFC) stack with external manifold structure is assembled and underwent a durability test with an output of 250 w for nearly 4400 h when current density and operating temperature are 355 mA/cm(2) and 750 degrees C. Cells used in the stack are anode-supported cells (ASC) with yttria-stabilized zirconia (YSZ) electrolytes, Ni/YSZ hydrogen electrodes, and YSZ based composite cathode. The dimension of the cell is 150 x 150 mm (active area: 130 x 130 mm). Ceramic-glass sealant is used in the stack to keep the gas tightness between cells, interconnects and manifolds. Pure hydrogen and dry air are used as fuel and oxidant respectively. The stack has a maximum output of 340 W at 562 mA/cm(2) current density at 750 degrees C. The stack shows a degradation of 1.5% per 1000 h during the test with 2 thermal cycles to room temperature. After the test, the stack was dissembled and examined. The relationship between microstructure changes of interfaces and degradation in the stack are discussed. The microstructure evolution of interfaces between electrode, contact material and current collector are unveiled and their relationship with the degradation is discussed.

【 授权许可】

Free