Abstract Three-electrode half-cells with La0.3Ca0.7Fe0.7Cr0.3O3-δ porous electrodes were prepared by screen-printing technology. The electrodes with thicknesses ranging from ∼12 to ∼62 μm exhibited similar microstructures. The electrocatalytic properties of the electrodes for oxygen reduction reaction were investigated with respect to electrode thickness. The contributions of various electrode processes to the overall electrode polarization were resolved, among which the dissociative adsorption of molecular oxygen on the surface made the most substantial contribution. A significant dependence of the electrocatalytic properties on electrode thickness was detected. Tuning electrode thickness was demonstrated to be effective in optimizing the electrocatalytic properties. The electrode with a thickness of ∼43 μm achieved the optimal electrocatalytic properties among the electrodes investigated. At 800 °C in air, this electrode showed a polarization resistance of ∼0.06 Ω⋅ cm2, an exchange current density of 797 mA⋅ cm-2 and an overpotential of 9.3 mV under an applied cathodic current density of 200 mA⋅ cm-2.

中文翻译：

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La0.3Ca0.7Fe0.7Cr0.3O3-δ 电极的氧还原反应电催化性能改善：电极厚度的影响

摘要 采用丝网印刷技术制备了La0.3Ca0.7Fe0.7Cr0.3O3-δ多孔电极的三电极半电池。厚度范围从~12 到~62 μm 的电极表现出相似的微观结构。根据电极厚度研究了用于氧还原反应的电极的电催化性能。解决了各种电极过程对整体电极极化的贡献，其中分子氧在表面的解离吸附做出了最大的贡献。检测到电催化性能对电极厚度的显着依赖性。调整电极厚度被证明在优化电催化性能方面是有效的。在所研究的电极中，厚度约为 43 μm 的电极实现了最佳的电催化性能。在空气中 800 °C 时，该电极的极化电阻为 ∼0.06 Ω⋅ cm2，交换电流密度为 797 mA⋅ cm-2，在施加的阴极电流密度为 200 mA⋅ cm-2 下的过电位为 9.3 mV .