Development of Ni1-xCoxO as the cathode/interconnect contact for solid oxide fuel cells

Journal Article · Wed Jun 01 04:00:00 EDT 2011 · Electrochemistry Communications, 13(6):642-645

DOI:https://doi.org/10.1016/j.elecom.2011.03.034· OSTI ID:1021824

Lu, Zigui; Xia, Guanguang; Templeton, Joshua D; Li, Xiaohong S; Nie, Zimin; Yang, Zhenguo; Stevenson, Jeffry W

A new type of material, Ni1-xCoxO, was developed for solid oxide fuel cell (SOFC) cathode/interconnect contact applications. The phase structure, coefficient of thermal expansion, sintering behavior, electrical property, and mechanical bonding strength of these materials were evaluated against the requirements of the SOFC cathode/interconnect contact. A dense cathode/interconnect contact layer was developed through reaction sintering from Ni and Co metal powders. An area specific resistance (ASR) as low as 5.5 mohm.cm2 was observed after 1000 h exposure in air at 800 °C for the LSM/Ni0.33Co0.67O/AISI441 assembly. Average mechanical strengths of 6.8 and 5.0 MPa were obtained for the cathode/contact/cathode and interconnect/contact/interconnect structures, respectively. The significantly low ASR was probably due to the dense structure and therefore improved electrical conductivity of the Ni0.33Co0.67O contact and the good bonding of the interfaces between the contact and the cathode, and between the contact and the interconnect.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1021824
• Report Number(s): PNNL-SA-77654; AA2530000
• Journal Information: Electrochemistry Communications, 13(6):642-645, Journal Name: Electrochemistry Communications, 13(6):642-645 Journal Issue: 6 Vol. 13; ISSN 1388-2481
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
AIR
BONDING
ELECTRIC CONDUCTIVITY
SINTERING
SOFC
SOLID OXIDE FUEL CELLS
THERMAL EXPANSION
interconnect cathode contact
reaction sintering
solid oxide fuel cell