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研究生: 楊燿瑜
Yao-Yu Yang
論文名稱: 電漿噴塗法成長具奈米結構之固態氧化物燃料電池陽極薄膜Ni/YSZ 之結構與電性分析
Structural and electrical performance analysis on nanostructure of plasma-spray- coating solid oxide fuel cell anode (Ni/YSZ)
指導教授: 李志浩
Chih-Hao Lee
黃振興
Chang-Sing Hwang
口試委員:
學位類別: 碩士
Master
系所名稱: 原子科學院 - 工程與系統科學系
Department of Engineering and System Science
論文出版年: 2005
畢業學年度: 93
語文別: 中文
論文頁數: 87
中文關鍵詞: 固態氧化物燃料電池陽極活化極化損失奈米顆粒三相態孔隙率
外文關鍵詞: SOFC, Anode, Activation polarization loss, Nano particle, Three phase boundary, porosity
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  • 此文章主要介紹,大氣電漿噴塗技術成長具奈米結構之固態氧化物燃料電池陽極薄膜形貌及其性質,藉由熱電漿乾式噴塗法,可以確切成功製造出具奈米顆粒結構之陽極薄膜,由實驗結果觀察得:經由電漿噴塗且還原過後之陽極薄膜(Ni/YSZ),其薄膜顆粒大小約為50~60 nm,孔隙率(Porosity)約為25 %,相較於一般製程所成長之陽極薄膜之顆粒大小(1~2μm)明顯細小許多,而微米顆粒所組成之陽極薄膜孔隙率約為30~50 %,而顆粒大小、孔隙率以及孔隙大小,將影響陽極薄膜之三相態(Three phase boundary)之數量,而三相態之數量多寡與電化學反應面積成正比關係,且當陽極薄膜顆粒大小達奈米尺度(50~60 nm)時,三相態數量約為微米顆粒(1~2 μm)之陽極薄膜3~4個數量級(order);且在固態氧化物燃料電池運轉過程中,活化極化(Activity polarization)損失,為燃料電池輸出功率損失之一,由T.Fukui[1]提出,電極之活化極化與電極之顆粒大小有一定之關係式,若電極之顆粒越小,其活化極化損失可以藉此改善。所以當陽極薄膜顆粒大小製備成奈米顆粒時,顆粒與顆粒之間除了提高接觸機率外,更可以大幅提升電化學反應區之面積(即三相態,TPB),以提升燃料電池作用時之發電效率。


    In this research, we fabricated the nano-particle structure of solid oxide fuel cell (SOFC) anode film by thermal plasma spray coating, which produced a homogeneous layer of NiO/YSZ mixture coated on the YSZ substrate. Then, reduce the sample of NiO/YSZ to Ni/YSZ by mixture gas (7 % H2 + 93 % Ar) in high temperature (800℃). After reduction, the particle size of film of the SOFC anode is about 50 nm. In our sample, we estimated the number of three phase boundary (TPB) is about 3~4 orders of magnitude better than micro scale particles. The result can obviously increase the electrochemical reaction area in SOFC anode. The single layer of anode is highly conductive with 1000 S/cm in room temperature. We observed the morphology and structure of SOFC anode by X-ray powder diffraction (XRD) 、scanning electron microscopy (SEM) 、 atomic force microscopy (AFM) and Brunauer-Emmett-Teller (BET). These tools can help us observed the characteristic of nano-particle in SOFC anode.

    目 錄 英文摘要 …………………………………………………………… Ι 中文摘要 …………………………………………………………… Π 誌 謝 ……………………………………………………………… Ⅲ 第一章 緒 論 …………………………………………………… 1 1-1、前 言 ……………………………………………………… 1 1-2、研究內容與目的 …………………………………………… 2 第二章 文獻回顧 ………………………………………………… 4 2-1、固態氧化物燃料電池陽極特性介紹 ……………………… 8 2-2、SOFC陽極材料之選擇 ……………………………………… 14 2-3、SOFC薄膜製作方式 ………………………………………… 18 第三章 實驗方法 ………………………………………………… 23 3-1、X光粉末繞射法 …………………………………………… 25 3-2、X光吸收光譜法(XANES) …………………………………… 27 3-3、BET比表面積量測法 ……………………………………… 29 3-4、電子顯微鏡量測法 ………………………………………… 31 3-5、原子力顯微鏡量測法 ……………………………………… 33 3-6、磁力顯微鏡量測法 ………………………………………… 35 3-7、高溫電導率量測法 ………………………………………… 36 第四章 結果與討論 ……………………………………………… 39 4-1、陽極薄膜材料粉末繞射結果 ……………………………… 40 4-2、X光吸收光譜法(XANES)結果 ……………………………… 45 4-3、陽極薄膜顯微像分析與討論 ……………………………… 49 4-4、常溫及高溫電導率之結果 ………………………………… 66 4-5、比表面積大小與粗糙度分析 ……………………………… 71 第五章 結 論 …………………………………………………… 76 第六章 未來建議 ………………………………………………… 78 Reference …………………………………………………………… 80 Appendix …………………………………………………………… 84

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