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Issue 31, 2014
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Origins of structural and electrochemical influence on Y-doped BaZrO3 heat-treated with NiO additive

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Abstract

Nickel (Ni) is expected to be an attractive anode material for protonic ceramic fuel cells using Y-doped BaZrO3 (BZY) as an electrolyte, since Ni shows good catalytic properties for the anode reaction, and NiO is a sintering aid for BZY. In this work, a systematic investigation has been performed to reveal the influence of Ni incorporation on structural and electrochemical properties of BZY. Then, some new knowledge was obtained; the important point is that Ni cations occupy the interstitial position of (1/2, 0, 0) in the lattice of BZY, with a greatly Ba-deficient environment. As a result, Ba cations were possibly driven to the grain boundary and induced the formation of a liquid phase, which promoted the sintering process. However, the occupation of Ni on this (1/2, 0, 0) position also resulted in a negative influence on conductivity. A careful processing is required to apply Ni as the electrode in BZY based fuel cells.

Graphical abstract: Origins of structural and electrochemical influence on Y-doped BaZrO3 heat-treated with NiO additive

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Publication details

The article was received on 08 Apr 2014, accepted on 26 May 2014 and first published on 29 May 2014


Article type: Paper
DOI: 10.1039/C4TA01689K
Citation: J. Mater. Chem. A, 2014,2, 12552-12560

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    Origins of structural and electrochemical influence on Y-doped BaZrO3 heat-treated with NiO additive

    D. Han, K. Shinoda, S. Tsukimoto, H. Takeuchi, C. Hiraiwa, M. Majima and T. Uda, J. Mater. Chem. A, 2014, 2, 12552
    DOI: 10.1039/C4TA01689K

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