新型对称固体氧化物燃料电池电极材料

占忠亮 刘雪娇 韩达

摘 要：对称固体氧化物燃料电池的主要难点在于选择合适的电极材料使其可以在阴极的氧化气氛和阳极的还原气氛中均保持稳定，对氧气还原和氢气氧化反应同时具有良好的催化活性。该文采用Sc掺杂的铁酸锶镧La0.6Sr0.4Fe0.9Sc0.1O3-δ做对称电极活性材料，实验结果表明其在氧气和氢气中具有良好的结构稳定性和理想的电导率。采用浸渍法在多孔La0.9Sr0.1Ga0.8Mg0.2O3-δ？衬底中沉积La0.6Sr0.4Fe0.9Sc0.1O3-δ纳米颗粒以制备复合电极，其对阴极和阳极电化学反应表现出较高的催化活性，在800 ℃时，电池空气中极化阻抗为0.015Ωcm2，通过优化后其在97% H2～3% H2O中的极化阻抗为0.29 Ω cm2，最大输出功率为536 mW/cm2。

关键词：钪掺杂铁酸锶镧 浸渍法 纳米颗粒 对称固体氧化物燃料电池 锶镁掺杂镓酸镧

Abstract：The main barrier to symmetrical solid oxide fuel cells （SOFCs）， where the same catalytic materials are used simultaneously as the anodes and the cathodes， is to identify a redox-stable catalyst that exhibits superior catalytic activities for both fuel oxidation and oxygen reduction reactions. Here we report a Sc-substituted La0.6Sr0.4FeO3-δ oxide， La0.6Sr0.4Fe0.9Sc0.1O3-δ， that shows great promise as a new symmetrical electrode material with good structural stability and reasonable conductivities in air and hydrogen. We further demonstrate that nano-scale La0.6Sr0.4Fe0.9Sc0.1O3-δ catalysts impregnated into the porous La0.9Sr0.1Ga0.8Mg0.2O3-δ backbones exhibit good catalytic activities for oxygen reduction and hydrogen oxidation reactions and thereby yield low polarization resistances， e.g.， 0.015 Ω cm2 in air and 0.29 Ω cm2 in hydrogen with appropriate current collection at 800 ℃. Thin La0.9Sr0.1Ga0.8Mg0.2O3-δ electrolyte fuel cells with such symmetrical La0.6Sr0.4Fe0.9Sc0.1O3-δ catalysts showed maximum power densities of 536 mW/cm2 when operating on 97% H2 - 3% H2O at 800 ℃.

Key Words：Scandium-substituted lanthanum strontium ferrite；Impregnation；Nanostructure；Symmetric solid oxide fuel cell；Strontium-and magnesium-doped lanthanum gallate

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