Electrochemical Behavior of Ni-CZO Cermet Anodes Prepared By Glycine Nitrate Process

Title
Electrochemical Behavior of Ni-CZO Cermet Anodes Prepared By Glycine Nitrate Process
Authors
다사리하리김혜령박종성이해원이종호
Keywords
SOFC; anode; composite powder; *SOFC XI (ECS 216th meething),Full Paper/Poster
Issue Date
2009-10
Publisher
ECS transactions
Citation
VOL 25, NO 2, 1921-1929
Abstract
The impact of H2O for H2 oxidation on Ni-Ce0.75Zr0.25O2 (Ni-CZO) anode material synthesized by glycine-nitrate-process has been investigated under dry and wet H2 fuel atmospheres over a range of operating conditions using yttria-stabilized zirconia (YSZ) electrolyte. Using electrochemical impedance spectroscopy (EIS), the polarization resistance (comprised of high frequency (HF) and low frequency (LF) features) of Ni-CZO symmetrical cells (Ni- CZO/YSZ/Ni-CZO) has been studied. The LF arc was almost negligible at all the operating temperatures in wet condition, and the HF arc linearly increased with time at 800℃ only in dry condition. The EIS response in dry and wet H2 conditions clearly exhibited that water vapor enhanced the dissociative adsorption and surface diffusion of hydrogen and achieved stable electrochemical performance at 3PB on the Ni-CZO cermet.
URI
http://pubs.kist.re.kr/handle/201004/45528
ISSN
1938-5862
Appears in Collections:
KIST Publication > Article
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