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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 何國川 | |
dc.contributor.author | Wan-Yu Cheng | en |
dc.contributor.author | 程琬淯 | zh_TW |
dc.date.accessioned | 2021-06-16T07:06:17Z | - |
dc.date.available | 2015-07-15 | |
dc.date.copyright | 2014-07-15 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-07-10 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57832 | - |
dc.description.abstract | This thesis aims to prepare the TiO2 as the photoanodes and highly efficient catalytic materials of the counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). There are three parts in this thesis: applying TiO2 nanotubes (TNTs) to the photoanodes, preparing the Pt-free catalysts for CEs in DSSCs (Chapter 5), and finally coupling the above prepared TiO2 electrodes with the Pt-free CEs (Chapter 5).
In Chapter 3, one–dimensional TNT arrays (TNT-A) prepared by electrochemically anodizing Ti foils have been suggested to apply as the photoanode of DSSCs for many years to improve the charge transfer and reduce the charge recombination. In this study, to avoid back illumination, the detached TNT-A obtained through a two–step anodization process is transferred onto an fluorine-doped tin oxide (SnO2:F) (FTO) glass. The influence of the configuration of the detached TNT-A is studied by attaching single–end and double–ends opened TNT-A on FTO glasses with different sides facing up. By considering the dye loading amount and light utilization, the best light–to–electricity conversion efficiency of 8.46% was obtained for the DSSC with the photoanode fabricated by using a double–ends opened TNT-A with the larger–diameter-end facing up. Since high temperature sintering of a semiconductor film is not possible for a flexible DSSC, due to low thermal endurance of its plastic substrates. A new technique is developed in Chapter 4 to fabricate a flexible DSSC. TNT were obtained by anodization of Ti foil, detached, sintered, ground, and mixed with a paste of P25 (commercial TiO2 powders) and TTIP (tetraisopropoxide) in ethanol; the paste was coated on an ITO glass by a doctor-blade technique, and the thus obtained film was sintered at a low temperature of 150 ◦C to obtain the photoanode for a DSSC. Sintering temperature of the TNT was optimized with respect to photovoltaic performance of the DSSC. Different weight percentages of the sintered TNT were added to the above mentioned paste to prepare photoanodes, and the photovoltaic performance of the corresponding DSSCs was also studied. Electrochemical impedance spectra (EIS) analysis has revealed that the incorporation of the TNT in the paste has actually accelerated the electron transfer at the interface of the semiconductor film electrolyte. While the DSSC with glass substrates shows an η of 6.80% under one sun condition, the DSSC with semi-flexible photoanode and the fully flexible DSSC show η of 4.62% and 4.35%, respectively. The films are characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) patterns. The photovoltaic parameters are substantiated by EIS, UV-Vis absorption spectra, and incident photon-to-current conversion efficiency (IPCE) spectra. In Chapter 5, Ni3Se4/graphene composites were synthesized in an oil bath at a low temperature (90 oC) with the precursors of Ni and Se in the presence of graphene. By tuning the concentrations of the precursors, the size and distribution of the Ni3Se4 nanoparticles (NPs) on the graphene sheet could be controlled, which were crucial factors for approaching high electrocatalytic ability of the I3- reduction. Ni3Se4 NPs, with the size of 50 to 90 nm in diameter, were uniformly grown on the surface of graphene for 1.0 mM precursors. Due to the incorporation of graphene, which not only acted as a matrix to control the size and distribution of the Ni3Se4 NPs, but also acted as the linker to enhance the electrical connection between the NPs. Ni3Se4/graphene showed high electrocatalytic ability and low charge transfer resistance. As a result, a composite film of Ni3Se4 /graphene as the CE, exhibited an efficiency of 8.49%, which was higher than those of NixSey NPs (6.29%), graphene (2.61%) and Pt (8.24%) CEs. KEYWORDS: Anodized TiO2 nanotubes, Dye–sensitized solar cell, Flexible dye–sensitized solar cell,Free-standingTiO2 nanotubes, Ni3Se4/graphene, Sintering temperature | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T07:06:17Z (GMT). No. of bitstreams: 1 ntu-103-R01524019-1.pdf: 3664764 bytes, checksum: 16aad18bb792e191f614a236325d6ca9 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | Chapter 1. Introduction 1
1.1. Background 1 1.2. Dye-sensitized solar cells (DSSCs) 2 1.2.1. Basic working principles of DSSCs 2 1.2.2. Construction of DSSCs 4 1.2.3. Photovoltaic parameters of DSSCs 19 Chapter 2. Experimental 24 2.1. Reagents and materials 24 2.2. Fabrication of photoanodes 25 2.3. Fabrication of counter electrodes with sputtered Pt film 26 2.4. Assembly of DSSCs 26 2.5. Instruments 26 2.5.1. Bode-phase plots 26 2.5.2. Cyclic voltammetry (CV) 27 2.5.3. Electrochemical impedance spectra (EIS) 27 2.5.4. Energy dispersive X-ray spectroscopy (EDX) 28 2.5.5. Incident photon-to-current conversion efficiency (IPCE) 29 2.5.6. Rotating disk electrode (RDE) 29 2.5.7. Scanning electron microscope (SEM) 31 2.5.8. Solar simulator 31 2.5.9. Transmission electron microscopy (TEM) 31 2.5.10. Tafel polarization plots 32 2.5.11. Ultraviolet-visible (UV-vis) spectrophotometer 33 2.5.12. X-ray diffraction (XRD) analysis 33 Chapter 3. Efficient Photoanode of Dye-Sensitized Solar Cells with TiO2 Nanotube Arrays: Study of Configuration on Optical and Light-absorber Loading Properties 34 3.1. Introduction 34 3.2. Experimental 35 3.2.1. Preparation of the photoanode with TNT films and the corresponding DSSC 35 3.2.2. Cell assembly and measurements 40 3.3. Results and discussion 41 3.3.1. Freestanding TNT-A 41 3.3.2. Photovoltaic performance and incident photon–to–current conversion efficiency of the DSSCs with freestanding TNT-A on the photoanode 44 3.3.3. Optical properties and dye-loading amounts for the photoanodes with TNT-A 47 3.4. Summary 51 Chapter 4. Sinter-Free Composite Film of Titanium Nanotubes and Titanium Nanoparticles for the Photoanode of a Flexible Dye-Sensitized Solar Cell 53 4.1. Introduction 53 4.2. Experimental 56 4.2.1. Preparation of titanium dioxide nanotubes 56 4.2.2. Preparation of a paste to obtain titanium nanoparticles 56 4.2.3. Preparation of the composite films 56 4.2.4. Cell assembly 57 4.3. Results and discussion 57 4.3.1. Surface morphologies of a bare TNP film and of the composite film with 0.1 wt% of TNT 57 4.3.2. XRD patterns of the ground TNT annealed at different temperatures 60 4.3.3. Photovoltaic performance of the DSSCs using composite films of TNT and TNP with TNT being annealed at different temperatures 60 4.3.4. EIS analysis for DSSCs using TNT annealed at different temperatures 63 4.3.5. Photovoltaic performance of the DSSCs using composite films with different weight percentages of TNT 65 4.3.6. EIS analysis for DSSCs with various amounts of TNT 67 4.3.7. UV-visible absorption spectra of the dyes desorbed from composite films 68 4.3.8. IPCE of the DSSCs with various amounts of TNT 69 4.3.9. Analysis of electron lifetime 71 4.3.10. Photovoltaic performance of non-flexible, semi-flexible and flexible DSSCs 72 4.3.11. Electrochemical impedance spectra of the non-flexible, semi-flexible and flexible DSSCs 73 Chapter 5. Ni3Se4/graphene composite materials for Dye-Sensitized Solar Cells 76 5.1. Introduction 76 5.2. Experimental 77 5.2.1. Synthesis of Ni3Se4 and NixSey NPs 77 5.2.2. Preparation of the Ni3Se4/graphene nanocomposites 78 5.2.3. Cell assembly 79 5.3. Results and discussion 79 5.3.1. Morphologies and compositions of the film of pristine graphene, Ni3Se4 NPs and Ni3Se4/graphene with various concentrations of precursors 79 5.3.2. Photovoltaic performance of DSSCs with pristine graphene, 10-NixSey NPs, and 10-Ni3Se4/graphene as CEs 84 5.3.3. Cyclic voltammetric analysis of the electrocatalytic activities of the electrodes with pristine graphene, 10-NixSey NPs, and 10-Ni3Se4/graphene as CEs 87 5.3.4. Photovoltaic performance of DSSCs with the CEs containing Ni3Se4/graphene with various concentrations of precursors 88 5.3.5. Cyclic voltammetric analysis of the electrocatalytic activities of the electrodes with the CEs containing Ni3Se4/graphene with various concentrations of precursors 89 5.3.6. Electrochemical impedance spectroscopic studies and Tafel polarization plots of the DSSCs with the CEs containing Ni3Se4/graphene with various concentrations of precursors 91 5.3.7. Photovoltaic performance of DSSCs with Pt and 1-Ni3Se4/graphene as CEs 94 5.3.8. Cyclic voltammetric analysis of the electrocatalytic activities of the electrodes with Pt and 1-Ni3Se4/graphene as CEs 95 5.3.9. Electrochemical impedance spectroscopic studies and Tafel polarization plots of the DSSCs with Pt and 1-Ni3Se4/graphene as CEs 96 5.3.11. Photovoltaic performance, IPCE spectra and EIS curves of the DSSCs with photoanode of LEU couple with the CE of 1-Ni3Se4/graphene and Pt, respectively 100 5.3.12. Photovoltaic performance, IPCE spectra and EIS curves of the DSSCs with photoanode of TiO2 composite film couple with the CE of 1-Ni3Se4/graphene and Pt, respectively 103 5.4. Summary 106 Chapter 6. Conclusion 107 Chapter 7. Suggestions and Prospects 108 7.1. Suggestion for single-end and double-ends opened TNT-A 108 7.2. Suggestion for the TiO2 composite films 108 7.3. Suggestion for Ni3Se4/graphene composite 109 References 110 Appendix 124 | |
dc.language.iso | en | |
dc.title | 應用二氧化鈦奈米管及硒化鎳/石墨烯於染料敏化太陽電池之研究 | zh_TW |
dc.title | TiO2 Nanotubes and Ni3Se4/Graphene for Dye-Sensitized Solar Cells | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 周澤川,楊明長,吳春桂,陳林祈 | |
dc.subject.keyword | 經陽極氧化的二氧化鈦奈米管,染料敏化太陽能電池,可撓染料敏化太陽能電池,脫離的二氧化鈦奈米管,硒化鎳/石墨烯,燒結溫度, | zh_TW |
dc.subject.keyword | Anodized TiO2 nanotubes,Dye–sensitized solar cell,Flexible dye–sensitized solar cell,Free-standing TiO2 nanotubes,Ni3Se4/graphene,Sintering temperature, | en |
dc.relation.page | 125 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-07-10 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
顯示於系所單位: | 化學工程學系 |
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