銅基材料於固態燃料電池之應用與熱熔擠組件開發

Abstract

本研究使用銅基材料製作固態燃料電池之陽極，進行以下的研究開發工作。測試銅與銅鋅合金之基本性質，如導電性、熱膨脹係數、硬度等特性，並對此金屬之抗氧化性做深入探討，測試並比較銅與鎳金屬、鈦六鋁四釩合金在不同測試條件下之氧化行為，最後用表面氧化層之微結構與熱重分析的氧化結果相互驗證。本研究亦製備摻釤及鈷之氧化鈰(Co-SDC)電解質，並提出合成與燒結SDC粉末的方法，利用銅的高導電性和防止積碳的特性，與SDC良好的催化性和離子導電性，使此電池能在750 oC達到112 mW cm-2的最高電功率輸出。此外有鑒於銅鋅合金相較於純銅有較低的熔點和成形性，非常適合做為3D列印的金屬胚料，因此本研究亦設計與開發一熱熔擠(ME)裝置來擠製銅鋅合金，此裝置能達到1100 oC，且有優異的隔熱特性，當擠出嘴為1000 oC時，此裝置外部僅為51 oC。

This study used Cu-based materials as an anode of solid oxide fuel cells (SOFCs) and conducted the following R&D works. Properties of Cu and Cu-Zn alloy were investigated, including electrical conductivity, coefficient of thermal expansion (CTE), hardness and oxidation behavior. The oxidation-resistance of Cu, Ni and Ti-6Al-4V was investigated and compared. Moreover, the microstructure of the oxide layers was observed to verify the results of TGA test. This study also developed cobalt-doped SDC cermet as an electrolyte for intermediate temperature (IT)-SOFC. The Cu-based electrode provided good electronic conductivity and prevented carbon deposition. The SDC was used as catalyst and ionic conductor. The methods to synthesize SDC and sinter a dense SDC electrolyte were also provided in this study. Maximum power density of the Cu-based SOFC was 112 mW cm-2 at 750 oC. On the other hand, due to a low melting point and good formability of Cu-Zn alloy, it was suitably applied on 3D printing (3DP) technique. As a result, a melt-extrusion (ME) module was designed to print Cu-Zn alloy. The ME module could reach 1100 oC to extrude Cu-Zn alloy. Besides, the heat insulation of the module was excellent, which was 51 oC outside the module while the temperature in the nozzle was 1000 oC.