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Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

机译：固体氧化物电池的耐碳和氧化还原渗透性氧化物燃料电极

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To solve issues of coking and redox instability related to the presence of nickel in typical fuel electrodes in solid oxide cells, Gd-doped CeO_2 (CGO) electrodes were studied using symmetric cells. These electrodes showed high electro-catalytic activity, but low electronic conductivity. When infiltrated with Sr_(0.99)Fe_(0.75)Mo_(0.25)O_(3-δ) (SFM), the electronic conductivity was enhanced. However, polarization resistance of the cells increased, suggesting that the infiltrated material is less electro-catalytically active and was partly blocking the CGO surface reaction sites. The activity could be regained by infiltrating nano-sized CGO or NiCGO on top of SFM, while still sustaining the high electronic conductivity. Ohmic resistance of the electrodes was thus practically eliminated and performance comparable to, or better than, state-of-the-art fuel electrodes was achieved. The Ni containing cells were damaged by carbon deposition in a CO/CO_2-atmosphere, while none of the non-nickel cells catalyzed carbon. Stability towards redox cycles was also proven.
机译：为了解决与固态氧化物电池中典型燃料电极中镍的存在有关的焦化和氧化还原不稳定性问题，使用对称电池研究了掺Gd的CeO_2（CGO）电极。这些电极显示出高的电催化活性，但是电子导电率低。当用Sr_（0.99）Fe_（0.75）Mo_（0.25）O_（3-δ）（SFM）渗透时，电子电导率提高。但是，细胞的极化电阻增加，表明所渗入的材料具有较低的电催化活性，并部分阻塞了CGO表面反应位点。可以通过在SFM顶部渗入纳米级CGO或NiCGO来恢复活性，同时仍保持高电子电导率。因此，实际上消除了电极的欧姆电阻，并且获得了与现有技术的燃料电极相当或更好的性能。含Ni的电池由于碳在CO / CO_2气氛中的沉积而受到破坏，而所有非镍电池均没有催化碳。还证明了对氧化还原循环的稳定性。

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  • 会议地点 San Diego(US)
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    T. L. Skafte; B. R. Sudireddy; P. Blennow; C. Graves;

  • 作者单位

    Department of Energy Conversion and Storage, Technical University of Denmark, Rise campus, Frederiksborgvej 399, 4000 Roskilde, Denmark ,Presently at Haldor Topsoe A/S, Haldor Topsoes Alle 1, 2800 Kgs. Lyngby, Denmark;

    Department of Energy Conversion and Storage, Technical University of Denmark, Rise campus, Frederiksborgvej 399, 4000 Roskilde, Denmark;

    Department of Energy Conversion and Storage, Technical University of Denmark, Rise campus, Frederiksborgvej 399, 4000 Roskilde, Denmark ,Presently at Haldor Topsoe A/S, Haldor Topsoes Alle 1, 2800 Kgs. Lyngby, Denmark;

    Department of Energy Conversion and Storage, Technical University of Denmark, Rise campus, Frederiksborgvej 399, 4000 Roskilde, Denmark;

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