占忠亮 劉雪嬌 韓達(dá)
摘 要:對(duì)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(yáng)極的還原氣氛中均保持穩(wěn)定,對(duì)氧氣還原和氫氣氧化反應(yīng)同時(shí)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(duì)稱電極活性材料,實(shí)驗(yàn)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(duì)陰極和陽(yáng)極電化學(xué)反應(yīng)表現(xiàn)出較高的催化活性,在800 ℃時(shí),電池空氣中極化阻抗為0.015Ωcm2,通過(guò)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(duì)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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