Katı oksit yakıt pillerinde katot akım toplama tabakasının farklı ticari katalizör tozları kullanılarak optimizasyonu: Mikroyapı-performans ilişkisi

Öz

Bu çalışmada, anot destekli mikrotüp katı oksit yakıt pili (µT-KOYP) performansına, katot akım toplama tabakası (KAT) bileşeni olarak kullanılan beş farklı ticari katot katalizör tozunun etkisi incelenmiştir. Elektrokimyasal testler 800 °C’de gerçekleştirilmiştir. Sonuçlar, hücre performansı ile katalizör tozunun mikroyapısal özellikleri arasında doğrudan bir korelasyon olduğunu göstermiştir. En düşük tepe güç yoğunluğu (238 mWcm-2), heterojen bir tane boyutu dağılımına sahip (La0.7Sr0.3)0.95MnO3 katalizörü ile üretilen hücrede gözlemlenmiştir. Öte yandan, en yüksek performans (318 mWcm-2), daha homojen ve nispeten büyük taneli (La0.80Sr0.20)0.95MnO3-X katalizörünün kullanıldığı hücrede ölçülmüştür. Empedans spektroskopisi, performans farkının temel olarak difüzyon direncinden kaynaklandığını ortaya koymuştur. Homojen, nispeten büyük taneli katalizörler, oksijen difüzyonunu kolaylaştıran gözenekli bir yapı oluşturmuştur. Bu bulgular, katot akım toplama tabakasının mikro yapısının, gaz taşınımını artırarak hücre performansını optimize etmek için kritik öneme sahip olduğunu göstermektedir.

Anahtar Kelimeler

• Mikrotüp katı oksit yakıt pili
• Katot akım toplama tabakası
• Elektrokimyasal performans

Optimization of the cathode current collection layer in solid oxide fuel cells using different commercial catalyst powders: Microstructure-performance relationship

Abstract

In this study, the performance of anode-supported microtubular solid oxide fuel cells (µT-SOFCs) was investigated using five different commercial cathode catalyst powders for the cathode current collecting layer (CCL). Electrochemical tests were conducted at 800 °C. The results showed a direct correlation between cell performance and the microstructural properties of the catalyst powder. The lowest peak power density (238 mWcm-2) was observed in the cell fabricated with (La0.7Sr0.3)0.95MnO3 catalyst, which had a heterogeneous grain size distribution. On the other hand, the highest performance (318 mWcm-2) was achieved with the (La0.80Sr0.20)0.95MnO3-X catalyst, characterized by a more homogeneous and relatively coarse-grained structure. Impedance spectroscopy revealed that the performance difference was primarily due to diffusion resistance. Homogeneous, coarse-grained catalysts created a porous structure that facilitated oxygen diffusion. These findings indicate that the microstructure of the cathode current collection layer is critical for optimizing cell performance by enhancing gas transport.

Keywords

• Microtubular solid oxide fuel cell
• Cathode current collection layer
• Electrochemical performance

Kaynakça

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