Role of Ceria-Zirconia Solid Solution with High Oxygen Storage Capacity in Cermet Anodes of Solid Oxide Fuel Cells

Title
Role of Ceria-Zirconia Solid Solution with High Oxygen Storage Capacity in Cermet Anodes of Solid Oxide Fuel Cells
Authors
이성일최문봉다사리하리홍종섭김형철손지원이종호김병국제해준윤경중
Keywords
Ceria-zirconia; Oxygen storage capacity; Cermet; Anode; Solid oxide fuel cell
Issue Date
2014-06
Publisher
Journal of the Electrochemical Society
Citation
VOL 161, NO 9, F883-F888
Abstract
A solid solution of ceria and zirconia is investigated as the ceramic component of the cermet anode for solid oxide fuel cells (SOFCs). Homogeneously dispersed NiO-Ce0.75Zr0.25O2-δ (CZO) composite powder is synthesized via a single-step combustion process based on the glycine-nitrate method. The electrolyte-supported cell composed of a Ni - CZO anode, yttria-stabilized zirconia (YSZ) electrolyte and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) - gadolinia-doped ceria (GDC) cathode is fabricated, and its electrochemical performance is compared with that of a reference cell employing the conventional Ni-YSZ anode. The Ni-CZO anode exhibits substantially higher performance than the Ni-YSZ anode, indicating that CZO actively participates in the anode's catalytic process, in contrast to YSZ. Impedance spectra of full-cells and half-cells are correlated to understand the electrode reaction mechanisms, and heavily overlapping impedance arcs are successfully deconvoluted using a differential relaxation time (DRT) technique. It is found that CZO promotes fuel oxidation through an oxygen spillover mechanism and enhances gas-solid interaction via H2 adsorption on the ceramic component of the cermet anode, resulting in a reduction of the electrode polarization resistance. The potential of the Ni-CZO anode for practical applications and a strategy for further development are discussed in detail.
URI
http://pubs.kist.re.kr/handle/201004/47697
ISSN
00134651
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KIST Publication > Article
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