占忠亮 劉雪嬌 韓達(dá)

摘 要：對稱固體氧化物燃料電池的主要難點(diǎn)在于選擇合適的電極材料使其可以在陰極的氧化氣氛和陽極的還原氣氛中均保持穩(wěn)定，對氧氣還原和氫氣氧化反應(yīng)同時具有良好的催化活性。該文采用Sc摻雜的鐵酸鍶鑭La0.6Sr0.4Fe0.9Sc0.1O3-δ做對稱電極活性材料，實(shí)驗結(jié)果表明其在氧氣和氫氣中具有良好的結(jié)構(gòu)穩(wěn)定性和理想的電導(dǎo)率。采用浸漬法在多孔La0.9Sr0.1Ga0.8Mg0.2O3-δ？襯底中沉積La0.6Sr0.4Fe0.9Sc0.1O3-δ納米顆粒以制備復(fù)合電極，其對陰極和陽極電化學(xué)反應(yīng)表現(xiàn)出較高的催化活性，在800 ℃時，電池空氣中極化阻抗為0.015Ωcm2，通過優(yōu)化后其在97% H2～3% H2O中的極化阻抗為0.29 Ω cm2，最大輸出功率為536 mW/cm2。

關(guān)鍵詞：鈧摻雜鐵酸鍶鑭 浸漬法 納米顆粒 對稱固體氧化物燃料電池 鍶鎂摻雜鎵酸鑭

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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