H₂ and CH₄ oxidation on Gd_0.2Ce_0.8O_1.9 infiltrated SrMoO₃-yttria-stabilized zirconia anode for solid oxide fuel cells

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• 作者：Peng Xiao^a ; Xiaoming Ge^b ; Lan Zhang^b ; Jong-Min Lee^a ; Jing-Yuan Wang^c ; Xin Wang^a ; ^{WangXin@ntu.edu.sg}
• 关键词：Nickel-free anode ; Solid oxide fuel cells ; Gadolinia doped ceria ; Strontium molybdate ; Wet impregnation ; Methane oxidation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：37
• 期：23
• 页码：18349-18356
• 全文大小：1230 K

文摘

Strontium molybdate (SrMoO₃) as an electronic conductor was incorporated with yttria-stabilized zirconia (YSZ) to form an anode scaffold for solid oxide fuel cells. Gd_0.2Ce_0.8O_1.9 (GDC) nanoparticles were introduced by wet impregnation to complete the Ni-free GDC infiltrated SrMoO₃-YSZ anode fabrication. The effects of SrMoO₃ on the electrode conductivity and GDC infiltration on the catalytic activity were examined. A pronounced performance improvement was observed both on wet H₂ and CH₄ oxidation for the 56?wt. % GDC infiltrated SrMoO₃-YSZ. In particular, the polarization resistance decreased from 8?¦¸?cm² to 0.5?¦¸?cm² under wet H₂ (3 % H₂O) at 800?¡ãC with the introduction of GDC. Under wet CH₄ at 900?¡ãC, a maximum power density of 160?mW?cm^?2 was obtained and no carbon deposition was observed on the anode. It was found that the addition of H₂O in the anode caused an increase of electrode ohmic resistance and a decrease of open circuit voltage. Redox cycling stability was investigated and only a slight drop in cell performance was observed after 5 cycles. These results suggest that GDC infiltrated SrMoO₃-YSZ is a promising anode material for solid oxide fuel cells.