Carbon-tolerance effects of Sm0.2Ce0.8O2-δ modified Ni/YSZ anode for solid oxide fuel cells under methane fuel conditions
- Carbon-tolerance effects of Sm0.2Ce0.8O2-δ modified Ni/YSZ anode for solid oxide fuel cells under methane fuel conditions
- 이정명; 김윤곤; 이성진; 김희수; 윤성필; 남석우; 윤순도; 윤정우
- Solid oxide fuel cell; SDC coating; Methane; Electrochemical oxidation; Carbon deposition
- Issue Date
- Journal of applied electrochemistry
- VOL 44, NO 5, 581-588
- Samarium-doped ceria (SDC) is coated onto a Ni/yttria-stabilized zirconia (Ni/YSZ) anode for the direct use of methane in solid-oxide fuel cells. Porous SDC thin layer is applied to the anode using the sol–gel coating method. The experiment was performed in H2 and CH4 conditions at 800 °C. The cell performance was improved by approximately 20 % in H2 conditions by the SDC coating, due to the high ionic conductivity, the mixed ionic and electronic conductive property of the SDC, and the increased triple phase boundary area by the SDC coating in the anode. Carbon was hardly deposited in the SDC-coated Ni/YSZ anode. The cell performance of the SDC-coated Ni/YSZ anode did not show any significant degradation for up to 90 h under 0.1 A cm−2 at 800 °C. The porous thin SDC coating on the Ni/YSZ anode provided the electrochemical oxidation of CH4 over the whole anode, and minimized the carbon deposition by electrochemical carbon oxidation.
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