Effect of Electrolyte Surface Modification on the Cathode Performance of Solid Oxide Fuel Cells

Zhaotong Wei; Zhiqun Cao; Hao Dong

doi:10.54097/w2x8q135

Authors

Zhaotong Wei
Zhiqun Cao
Hao Dong

DOI:

https://doi.org/10.54097/w2x8q135

Keywords:

Solid Oxide Fuel Cells, Electrolyte Surface Modification, Oxygen Reduction Reaction, Polarization Resistance

Abstract

Solid oxide fuel cells (SOFCs) are promising clean energy conversion devices, but their intermediate-temperature performance is severely limited by high polarization resistance, originating from sluggish cathodic oxygen reduction reaction (ORR) kinetics and insufficient electrolyte-cathode interfacial contact. Herein, a homogeneous YSZ rough layer was fabricated on the cathode side of 8 mol% yttria-stabilized zirconia electrolyte via spin-coating. Half-cells with La_0.3Sr_0.7Ti_0.3Fe_0.7O_3-δ(LSTF) cathode were assembled, and their electrochemical performance was systematically investigated at 800 °C under 0.05 and 0.21 atm oxygen partial pressure. This modification significantly enlarges the interfacial contact area and extends triple phase boundaries, achieving a maximum 33.4% reduction in polarization resistance at 800 °C under 0.05 atm. The enhancement mainly stems from reduced charge transfer and oxygen adsorption/dissociation resistance, providing a facile low-cost route for intermediate-temperature SOFC cathode optimization.

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