纳米TiO2修饰的La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)阴极被直接应用于YSZ电解质电池上. TiO2可阻止LSCF和YSZ间的化学反应,抑制SrZrO3的形成. LSCF-0.25 wt% TiO2阴极电池在0.7 V和600°C下的电流密度是LSCF阴极电池的1.6倍.电化学阻抗谱结果表明, TiO2修饰显著加快了氧离子注入电解质的过程,这可能与TiO2抑制了阴极/电解质界面处高电阻SrZrO3层的形成有关.本文为在ZrO2基电解质上使用高性能的(La,Sr)(Co,Fe)O3阴极材料提供了一种简单有效的方法.
A La0.6Sr0.4Co0.2Fe0.8O3‐δ(LSCF) cathode modified using nanosized TiO2 was direct prepared on the yttria stabilized zirconia (YSZ) electrolyte in an intermediate temperature solid oxide fuel cell. TiO2 prevents reaction between LSCF and YSZ, which would have formed a SrZrO3 phase. The cell with a LSCF‐0.25 wt%TiO2 cathode exhibited a current density that was 1.6 times larger than that with a pure LSCF cathode at 0.7 V and 600 °C. Electrochemical impedance spectra showed the accelerated incorporation of oxygen anions into the YSZ electrolyte with the TiO2‐modified LSCF cathode. The improvement was attributed to the suppressed formation of a non‐conductive SrZrO3 layer at the cathode/electrolyte interface.
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