Effect of Nd-deficiency on electrochemical properties of NdBaCo sub(2)O sub(6- delta ) cathode for intermediate-temperature solid oxide fuel cells

Nd sub(1-x)BaCo sub(2)O sub(6- delta ) (N sub(1-x)BCO) is evaluated as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The effects of Nd-deficiency on the crystal structure, thermal expansion behavior, electrical conductivity and electrochemical performance are stud...

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Bibliographic Details
Published in:International journal of hydrogen energy 2016-06, Vol.41 (24), p.10228-10238
Main Authors: Yia, Kaihua, Suna, Liping, Lia, Qiang, Xiaa, Tian, Huoa, Lihua, Zhaoa, Hui, Lib, Jingwei, Lueb, Zhe, Bassatc, Jean-Marc, Rougierc, Aline, Fourcadec, Sebastien, Grenierc, Jean-Claude
Format: Article
Language:English
Subjects:
Cathodes
Electric power generation
Electrochemical analysis
Nickel
Oxygen
Reduction
Solid oxide fuel cells
Thermal expansion
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Summary:Nd sub(1-x)BaCo sub(2)O sub(6- delta ) (N sub(1-x)BCO) is evaluated as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The effects of Nd-deficiency on the crystal structure, thermal expansion behavior, electrical conductivity and electrochemical performance are studied. N sub(1-x)BCO oxides crystallize in the orthorhombic symmetry with Pmmm space group. A good chemical compatibility between N sub(1-x)BCO and CGO electrolyte is found at 1100 degree C in air. Introducing Nd-deficiency promotes the formation of oxygen vacancy, and significantly improves the electrochemical performance of N sub(1-x)BCO cathodes. The lowest area specific resistance (ASR) value of 0.043 Omega cm super(2) is obtained on the N sub(0.96)BCO cathode at 700 degree C in air. The rate limiting step for electrochemical oxygen reduction reaction (ORR) is charge transfer process at the interface. The power output of the electrolyte supported cell Ni-CGO/CGO/N sub(0.96)BCO reaches 0.6 W cm super(-2) at 700 degree C.
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2016.04.248