(Invited) High Performance Nano-Ceria Electrodes for Solid Oxide Cells
(Invited) High Performance Nano-Ceria Electrodes for Solid Oxide Cells
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（特邀）固体氧化物电池用高性能纳米二氧化铈电极
DOI：
10.1149/07207.0183ecst
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
B. Sudireddy
中科院分区：
文献类型：
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作者：
C. Graves;L. Martinez;B. Sudireddy
在固体氧化物电化学电池中，传统的镍基燃料电极提供高的电催化活性，但它们往往是长期性能下降的主要来源，由于碳沉积，中毒的反应位点，镍的流动性等掺杂氧化铈是一种有前途的混合离子电子导电氧化物，可以解决这些问题，如果它可以被集成到一个适当的电极结构。两种新的方法来获得高性能的纳米结构掺杂氧化铈电极的突出。第一种是基于渗透的体系结构，采用Ce 0。8Pr0。2 O2-δ在具有嵌入的电子集电器材料的多孔骨架上形成活性表面，产生了对在燃料或氧化剂上操作的电极所报道的最高性能之一。第二种是纳米Ce 0。9Gd0。1 O2-δ薄膜在650 C H2/H2O中的电极极化电阻为~ 0.01 Ω cm 2。这些结果表明，纳米二氧化铈具有实现比Ni基电极更高的性能的能力，并且表明主要挑战是在不添加太多非活性材料的情况下获得足够的电子电流收集。
In solid oxide electrochemical cells, the conventional Ni-based fuel-electrodes provide high electrocatalytic activity but they are often a major source of long-term performance degradation due to carbon deposition, poisoning of reaction sites, Ni mobility, etc. Doped-ceria is a promising mixed ionic-electronic conducting oxide that could solve these issues if it can be integrated into an appropriate electrode structure. Two new approaches to obtain high-performance nanostructured doped-ceria electrodes are highlighted. The first is an infiltration-based architecture with Ce0. 8Pr0. 2O2-δ forming the active surfaces on a porous backbone with embedded electronic current collector material, yielding one of the highest performances reported for an electrode that operates either on fuel or oxidant. The second is a nano-Ce0. 9Gd0. 1O2-δ thin film prepared by spin-coating, which provides an unprecedented electrode polarization resistance of~ 0.01 Ω cm 2 at 650 C in H2/H2O. These results demonstrate that nano-ceria has the ability to achieve higher performance than Ni-based electrodes and show that the main challenge is obtaining sufficient electronic current collection without adding too much inactive material.