指導教授：林唯芳臺灣大學：材料科學與工程學研究所涂煜杰Tu, Yu-ChiehYu-ChiehTu2014-11-262018-06-282014-11-262018-06-282014http://ntur.lib.ntu.edu.tw//handle/246246/262054The bismuth-based metal oxides, such as BiFeO3 (BFO) and Bi/B-doped TiO2 are potential candidates for electrolyte of low temperature solid oxide fuel cell and solution processable hybrid solar cell, respectively. In this study, we synthesize bismuth-based metal oxides, and investigate the material characteristics and the cell characteristics. For low temperature solid oxide fuel cells, we prepared BFO as electrolyte. The material was synthesized using solution approach. Bismuth nitrate pentahydrate (Bi(NO3)3．5H2O) and iron nitrate nonahydrate (Fe(NO3)3．9H2O) were dissolved in the mixture of 2-ethoxyethanol and acetic acid at 70°C for 30 min. After evaporating the solvent, the BFO was calcined at 500°C for 2 hrs in air. The air calcined BFO was pressed into a disk which showed a pure BFO perovskite structure after sintered at either 850°C or 900°C. The BFO was coated with 100 micron yttria-stabilized zirconia (YSZ) buffer layer to avoid hydrogen reduction of BFO. This bilayer electrolyte exhibits 1.6 times increasing in maximum power density as compared with pure YSZ due to its perovskite structure, when Ni-YSZ anode and lanthanum strontium cobalt ferrite cathode were used in the fuel cell at 650°C. TiO2 nanorods were synthesized to fabricate hybrid P3HT:TiO2 solar cells. The TiO2 nanorods were synthesized using sol-gel process in the presence of oleic acid surfactant at 98℃ for 9 hrs. The size of TiO2 nanocrystal is about 35 nm in length and 5 nm in diameter. The insulating oleic acid on TiO2 nanorods was replaced by pyridine (as-synthesized TiO2) for good charge transport between P3HT and TiO2 in the application of hybrid P3HT:TiO2 nanorods solar cells. In order to improve the power conversion efficiency (PCE) of P3HT:TiO2 solar cell, we have further increased the crystallinity of anatase TiO2 nanorods. Two novel approaches: (1) ripening and (2) bismuth/boron doping for TiO2 nanorods were explored. The crystallinity of the as-synthesized TiO2 nanorods was increased through ripening (120℃, 24 hrs) by using an autoclave reactor while the size of nanocrystal was not significantly changed. The bismuth doped TiO2 (Bi-doped TiO2) and boron doped TiO2 nanorods (B-doped TiO2) were synthesized using the same sol-gel process of as synthesized TiO2 nanorods. The PCE of P3HT:TiO2 solar cells was increased by 1.31 times and 1.79 times under A. M. 1.5 illumination for ripened and B-doped TiO2, respectively, as compared with as-synthesized TiO2. The B-doped TiO2 has the highest mobility and PCE, mainly due to the presence of partially reduced Ti4+ by boron atom with delocalized electrons. W4-dye is a promising way for modifying the interface between P3HT and TiO2 charge transport further. The Bi-doped TiO2 has higher Jsc as compared with B-doped TiO2, mainly due to the presence of improvement of electron density under TiO2. The PCE of solar cell made of W4-dye modified TiO2 nanorods has been increased by 1.33 times and 1.30 times for Bi-doped TiO2 and B-doped TiO2, respectively, as compared with that of as-synthesized TiO2.摘要 I Abstract III Acknowledgement VI Table of Contents VII List of Figures IX List of Tables XI Chapter 1 Introduction 1 1.1 Green Energy 1 1.2 Solid Oxide Fuel Cell 2 1.2.1 Principle of Solid Oxide Fuel Cell 2 1.2.2 State of Art of Solid Oxide Fuel Cell 4 1.2.2.1 Fluorite-Type Structure 5 1.2.2.2 Perovskite-Type Structure 9 1.2.2.3 Structures of Bismuth-Based Electrolytes 10 1.3 Solar Cell 14 1.3.1 Principle of Bulk Heterojunction Solar Cells 14 1.3.2 State of Art of Solar Cell 16 1.4 Motivation 20 1.4.1 Bismuth Iron Oxide (BFO) as Electrolyte Used in Low Temperature (≤650°C) Solid Oxide Fuel Cell 20 1.4.2 Bismuth/boron Doped TiO2 for High Efficiency Polymer-Inorganic Nanoparticle Solar Cell 21 Chapter 2 Experimental Section 22 2.1 Solid Oxide Fuel Cell 22 2.1.1 Material 22 2.1.2 Synthesis and Characterization of BiFeO3 23 2.1.3 Fabrication and Characterization of Anode-Supported Solid Oxide Fuel Cell 31 2.2 Polymer-Nanoparticle Hybrid Solar Cell 32 2.2.1 Material 32 2.2.2 Synthesis and Characterization of Bi/ B Doped TiO2 Nanorods 33 2.2.3 Fabrication and Characterization of P3HT:TiO2 Solar Cell 38 Chapter 3 Results and Discussion 40 3.1 Low Temperature Solid Oxide Fuel Cell 40 3.1.1 Characterization of BiFeO3 Powder 40 3.1.2 Characterization of NiO-8YSZ / 8YSZ / BiFeO3 / LSCF-GDC Cell 51 3.2 Hybrid Solar Cell 57 3.2.1 Characterization of TiO2 Nanorods 57 3.2.2 Characterization of Performance of P3HT:TiO2 Solar Cells 69 Chapter 4 Conclusions 73 4.1 Solid Oxide Fuel Cell 73 4.2 P3HT:TiO2 Nanorods Solar Cell 73 Chapter 5 Recommendation 75 5.1 Improve the Power Density of Fuel Cell 75 5.1.1 Composite Cathode Based on BFO-YSZ for Low Temperature Solid Oxide Fuel Cell 75 5.2 Improve the Performance of Solar Cell 75 5.2.1 Synthesis of Bismuth and Boron Co-doped TiO2 Nanorods 75 5.2.2 Synthesis of Bismuth Titanate Nanoparticles 76 5.3 Synthesis of High Crystalline Bismuth-Doped TiO2 Nanorods for Photocatalysts 76 Chapter 6 References 78 Curriculum Vitae of Yu-Chieh Tu 933094629 bytesapplication/pdf論文公開時間：2015/07/11論文使用權限：同意有償授權(權利金給回饋本人)鐵酸鉍固態燃料電池二氧化鈦聚三己基噻吩太陽能電池thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/262054/1/ntu-103-D96527009-1.pdf