(La0.7Pr0.3)0.6Sr0.4Co0.2Fe0.8O3-δ/8YSZ/Pt 三極式試片經過800oC持溫200小時後，暸解其多孔性 電極在經過200 小時的模擬後，其顯微結構的變化，包含孔隙率、氣體通道彎曲率、表面 積與三相點等的變化。圖4-33 為(La0.7Pr0.3)0.6Sr0.4Co0.2Fe0.8O3-δ/8YSZ 經過800oC持溫200小 時的顯微結構圖，圖(a)(c)與(b)(d)比較之後發現長時效模擬之陰極材料電極其粒徑大於未做 模擬之試片，由此可知晶粒成長，使得三相點之長度減少、孔洞面積減少、催化面積減少、
氣體通道扭曲度增大，造成陰極材料電化學性質衰退的原因之ㄧ。晶粒成長使得孔洞面積 減少、催化面積減少進而造成三相點長度減少，而氣體通道扭曲度增大則會造成氧氣難以 進入陰極內部讓整體三相點的區域減少，且在高電流密度下，造成濃度過電壓增加的問題，
使得整體功率下降。
圖4-33 800oC持溫200小時之(La0.7Pr0.3)0.6Sr0.4Co0.2Fe0.8O3-δ/8YSZ/Pt 三極式半電池顯微結構 圖，(a)(c)為未做長效處理，(b)(d)長效處理後。
伍、結論
(La0.7Pr0.3)0.6Sr0.4Co0.2Fe0.8O3-δ 在操作溫度600oC～800oC的導電率為340～270 S/cm，其導
本研究獲國科會補助， 計畫代號為NSC94－2218－E－011－003。
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總計畫成果自評 料電池學術研討會與國外期刊Solid state ionic；子計畫二中的氧化鈰與CeO2/YSZ三明治或 複合結構電解質的部份，周振嘉教授已於本第二年期計畫目標為研究固態氧化物燃料電池 所舉辦的『International Symposium on Point Defect and Nonstichiometry』，與2006 年10 月 份於辛辛那提市( 美國俄亥俄州) 之DukeEnergy Center所舉辦的『Materials science &
Technology 2006 Conference and Exhibition 』。而子計畫三顏怡文助理教授所負責的鐵-鉻 合金與陽/陰極之界面反應與相平衡之研究，已完成確立鐵-鉻-鎳三元系統在750 與850℃下 的溫橫截面圖、完成數種鐵-鉻合金與鎳基材在750 與850℃下，於真空與大氣環境下之界 面反應、並分進行了數種銀-銅合金與鎳基材在不同反應溫度下的液/固界面反應。成果已經 分別投稿於第
一屆全國氫能與燃料電池學術研討會、2006年中國材料年會，並投稿於國際期刊J. Alloy.
Compd.與【一種接合固態氧化物燃料電池(SOFC)中陽極與不銹鋼雙極板的材料與技術】專 利申請；子計畫四中王朝正教授所負責的平板式SOFC雙極板材料之耐久性研究， 2205LSM 氧化速率遠低於2205DSS，並生成的緻密氧化物層隔絕氧氣擴散。電阻量測實驗顯示，預 氧化合金表面生成的氧化層，在溫度高於500°C以上時，面積比電阻ASR(Area specific resistance)值有大幅下降的趨勢，氧化層的組成與厚度會影響ASR值。此外，預濺鍍銀有助 於高溫導電率的提高，但預濺鍍銅則會使LSM層發生分解。本成果已經分別投稿於第一屆 全國氫能與燃料電池學術研討會、2006 年中國材料年會、2006 年防蝕工程學會年會並獲 推荐轉投防蝕工程學刊。研究成果也將申請專利【固態氧化物燃料電池金屬雙極板之鈣鈦 礦結構保護塗層製造方法】、【固態氧化物燃料電池之金屬雙極板材料】，正循本校研發 處技轉中心之程序，向經濟部智慧財產局提出申請中。
綜觀本年度總計畫與子計畫的研究成果，已開發出相當多創新專利並申請中，陸續進行發 電效率的量測，並已具有發電的能力，將在後半年持續進行單電池材料的改質，以提升其 發電效率；相信在未來第三年，將結合過去兩年與眾子計畫的開發成果，預期可發展具有 更高瓦數的燃料電池組，將為台灣的固態氧化物燃料電池開啟一條嶄新的道路。