固態氧化物燃料電池元件裡，電解質、電極及金屬雙極板為許多學者研究探討的主題。本文主要以探討氧化鋯電解質所需的機械性質與韌化行為，及改善金屬雙極板在高溫大氣下之氧化問題及導電特性。
在氧化鋯電解質韌化行為的研究裡，將添加不同含量的Y2O3及YNbO4等相安定劑於氧化鋯材料，利用XRD分析判定結構，利用維克氏壓痕硬度試驗了解各氧化鋯電解質之硬度及韌化性質，且由SEM觀察顯微結構之晶粒大小，最後利用即時單軸向壓應力之XRD、同步輻射XRD及拉曼光譜分析材料受壓應力時其結構之變化。
研究結果顯示，氧化鋯(3YSZ)的t相結構為介穩態結構，因存在t-to-m相變韌化機制、鐵彈性域轉換等吸收破壞能的機制存在，因此能表現不錯的機械性質及韌化行為，在同步輻射及拉曼光譜也觀察到t相結構受壓應力變化的結果。而氧化鋯(3YSZ)添加鈮酸釔卻可以穩定其正方性，抑制t相結構的變化，藉由同步輻射XRD及拉曼光譜散射分析觀察到c相結構變化較t相劇烈且Zr4+和O2-之間的C相振動Raman mode受到循環應力的影響而變化，說明氧化鋯c相結構具有吸收韌性的行為發生，說明此氧化鋯系統c相為介穩態結構，且表現出的韌化特性優於ZrO2(3Y)，此時並沒發現t-to-m相變韌化機制的存在，卻觀察到c相結構受到外力而產生結構自我調整的特殊行為。這對氧化鋯電解質於固態氧化物燃料電池的應用時，提升了抵抗循環熱應力及機械振動的影響，進而增加燃料電池的壽命。
在金屬雙極板抗氧化性研究的研究裡，藉由Sol-Gel浸鍍法及射頻磁控式濺鍍法在不銹鋼雙極板(SUS430、SUS304)披覆一層錳酸鍶鑭(LSMO)導電氧化物薄膜，經成相處理後再長時間高溫熱處理，並利用XRD、SEM觀察不銹鋼雙極板氧化問題。
研究結果顯示利用射頻磁控式濺鍍LSMO薄膜，可均勻披覆於不銹鋼雙極板，其成相溫度為800℃之成相性最佳。而經過長時間高溫熱處理發現，LSMO披覆於不銹鋼雙極板會使得不銹鋼的氧化路徑因為Mn含量的增加使得易生成Cr2O3的氧化行為轉變成易生成(Mn, Fe)Cr2O4，而抑制了Cr2O3的成長，另外(Mn, Fe)Cr2O4的高溫電阻率較Cr2O3低數千倍，提升金屬雙極板氧化後的高溫導電性特性。

In order to develop an outstand electrolyte that owns high mechanical and electric properties and a metallic interconnect that exhibits better oxidation-resistance for Solid Oxide Fuel Cell (SOFC) application in intermittent operation at high temperature. The purpose of this thesis is to investigate the mechanical properties and toughness behavior of zirconia electrolyte. Besides, the electric properties and oxidative problem of metallic interconnect were discussed in this study. A systematic study involves mechanical properties measurements, phase-composition characteristics and microstural analysis were conducted by micro-indentation hardness testing, X-ray diffractometer, in-situ compression-diffraction using synchrotron radiation source and Raman scattering spectrum, respectively.
The experimental results show that coexistence of two mechanisms, the ferroelastic domain switching and the stress-induced phase transformation were not observed in the YNbO4-modified ZrO2 (3Y) ceramics under stress loading at different levels. It is different from the results in the past literature. In the in-situ compression-diffraction experiment using synchrotron radiation, the results suggest there is a lattice adjustment of cubic phase occurred under stress loading. Besides the O2- and Zr4+ ions vibration varied under cyclic loading was observed using Raman scattering spectrum.
The La0.7Sr0.3MnO3 (LSMO) layer was coated on stainless steels (SUS430 and SUS304) using Sol-gel method and radio frequency (RF) sputtering. The results exhibit the best annealing temperature is 800℃ and LSMO coating layer produces high conductivity of (Mn,Fe)Cr2O4 that is one thousand times the electric conductivity of Cr2O3 and decreases the content of Cr2O3, because of Mn3+ content increase. This seems that t’-to-m’ phase transformation and cubic phase to adjust itself might be the primary energy-absorbing mechanism in the ZrO2-based electrolyte and LSMO coating layer improves the oxidation-resistance of metallic interconnect for SOFC application.

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