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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 韋文誠(Wen-Cheng Wei) | |
dc.contributor.author | Tung Chou | en |
dc.contributor.author | 周曈 | zh_TW |
dc.date.accessioned | 2021-06-15T06:44:36Z | - |
dc.date.available | 2011-07-07 | |
dc.date.copyright | 2011-07-07 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-06-29 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48022 | - |
dc.description.abstract | 螢石結構的鉺鈮氧化物共摻雜氧化鉍(縮寫為ENSB)擁有應用於中溫固態氧化物燃料電池(IT-SOFC)電解質的潛力。本研究利用膠粒製程,製作三成分混合的ENSB生胚,在870oC燒結16小時後,具有良好的密度與均勻度,並對ENSB的相穩定、導電度、長時間操作性、離子傳導係數做深入的探討。
本研究探討發鉺/鈮摻雜的比例與濃度,對於相穩定及電性的影響。利用特定鉺/鈮摻雜比例,總摻雜濃度(TDC)可以降到10 mol%來穩定得單相的δ相氧化鉍,並觀察到一個不尋常的晶格收縮行為,而當摻雜濃度低於10 mol%時,正方結構的β相會在降溫過程中生成。我們也利用TEM及EDS對晶界做化學成分的分析,發現在晶界附近並沒有明顯的偏析現象發生。 導電性方面利用兩點式直流測量,發現6.7E3.3NSB(6.7 mol% Er2O3和3.3 mol% Nb2O5共摻雜氧化鉍) 最佳的導電度在500oC、600oC與700oC分別為 0.351、0.209與0.116 Scm-1,10E5NSB則在650oC,300小時的熱處理下,展現最佳的相穩定性與穩定的導電性1.6x10-2 Scm-1。接著利用DTA、TEM、SEM及XRD及兩點式直流測量,證明電性劣化的機制不是因為氧空缺有序化,而是由γ-相生成所控制。最後,利用EMF法來測量ENSB的離子傳導係數,在600oC以上,離子傳導係數皆可達到大於0.9的水準,具有良好的離子導電性。 | zh_TW |
dc.description.abstract | Er- and Nb- co-doped Bi2O3 materials (abbreviated as ENSB) with fluorite structure show a great potential to be applied as the electrolyte of intermediate temperature-solid oxide fuel cell (IT-SOFC). The colloidal process was used to prepare well-mixed green bodies and sintered at 870oC for 16 hr to get homogenous and dense ENSB samples. The phase stabilization, electrical conductivity, long-term test, and ionic transference number of ENSBs were studied.
This study investigated the effects of dopant ratio Er/Nb, minimal total doping concentration (TDC) on several interesting electric conductive properties. The TDC can be decreased to 10 mol% which is still able to stabilize δ-Bi2O3 in short term. However, when the concentration is lower than 10 mol%, tetragonal β-Bi2O3 appears after cooling. Additionally, an abnormal lattice contraction behavior of the δ-phase was observed in the ENSB. TEM and micro-beam EDS were carried out to analyze the composition around the grain boundaries. No significant segregations of the dopants were found around the grain boundaries. 6.7E3.3NSB (6.7 mol% Er2O3 and 3.3 mole% Nb2O5 co-doped stabilized Bi2O3) exhibited best conductivity of 0.351, 0.209, and 0.116 Scm-1 at 500oC, 600oC and 700oC, respectively, which were measured by 2-probes DC method. The 10E5NSB presents the best phase stability and stable conductivity of 1.6x10-2 Scm-1 after annealing at 650oC for 300 hr. The DTA, TEM, SEM and XRD results demonstrated the degradation of conductivity of 10E5NSB at 650oC, which was controlled by γ-phase formation, not by oxygen vacancy-ordering. The ionic transference number of ENSB measured by EMF method is greater than 0.9 at 600oC to 700oC. High transference number implies high ionic conductivity of ENSB materials. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T06:44:36Z (GMT). No. of bitstreams: 1 ntu-100-R98527040-1.pdf: 5512651 bytes, checksum: 044cc9f5c40dbd158cdf977bd641a535 (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 摘要 I
Abstract II List of Figures VI List of Tables IX Chapter 1 Introduction 1 Chapter 2 Literature Review 4 2.1 Characteristics of Bi2O3 Material 4 2.1.1 Phase Transformation and Properties of Pure Bi2O3 5 2.1.2 Doped Bi2O3 systems 6 2.1.3 Long-term stability and degradation of Conductivity 8 2.2 Ionic Transference Phenomena 10 2.3 Collidal Processing 13 2.3.1 Stability of Suspension 13 2.3.2 Interaction of Particles with Dispersant 16 Chapter 3 Experimental Procedure 31 3.1 Sample Preparation 31 3.1.1 Materials 31 3.1.2 Pressure Filtration 31 3.2 Charactrization 32 3.2.1 Sedimentation Test 32 3.2.2 Particles Size Measurement 32 3.2.3 Zeta Potential Measurement 33 3.2.4 Density Measurement 33 3.3.5 X-ray Diffraction 34 3.2.6 Electrical Conductivity Measurement 35 3.2.7 Microstructure Observations 35 3.2.8 Thermal Analysis 36 3.2.9 Electromotive Force (EMF) Test 36 3.3 Nomenclature of Composition 37 Chapter 4 Results and Discussion 41 4.1 Colloidal Processing of ENSB Samples 41 4.1.1 Milling Effect of Milling-Ball Content 41 4.1.2 Properties of Er2O3 Powders 42 4.1.3 Pressure Filtration Forming 44 4.2 Phase Stabilization 51 4.2.1 Effect of Dopant Ratio 51 4.2.2 Effect of Total Doping Concentration on the Structures 51 4.2.3 Structure Abnormity at Grain Boundaries 54 4.3 Electrical Conductivity 67 4.3.1 Effect of TDC 67 4.3.2 Discussion of Minimum Doping Concentration 69 4.4 Long-term Stability 74 4.4.1 Phase Stability 74 4.4.2 Degradation of Electrical Conductivity 76 4.4.3 Investigation on Stability in Compositional Domain 78 4.5 Ionic Transference Number 93 4.5.1 Effect of Temperature 93 Chapter 5 Conclusions 98 Reference 102 | |
dc.language.iso | en | |
dc.title | 鉺鈮氧化物共摻雜氧化鉍電解質之相穩定性與電性之研究 | zh_TW |
dc.title | Study of Phase Stability and Electric Conductivity of Er2O3-Nb2O5 Co-doped Bi2O3 Electrolyte | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 馬小康(Hsiao-Kan Ma),林永仁(Yung-Jen Lin),郭俞麟(Yu-Lin Kuo) | |
dc.subject.keyword | 氧化鉍,固態氧化物燃料電池,螢石結構,導電性,離子傳導係數, | zh_TW |
dc.subject.keyword | Bi2O3,SOFC,conductivity,fluorite,ionic transference number,annealing, | en |
dc.relation.page | 110 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-06-30 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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