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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90052完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 姜昌明 | zh_TW |
| dc.contributor.advisor | Chang-Ming Jiang | en |
| dc.contributor.author | 陳重宇 | zh_TW |
| dc.contributor.author | Jong-Yu Chen | en |
| dc.date.accessioned | 2023-09-22T17:12:54Z | - |
| dc.date.available | 2023-11-09 | - |
| dc.date.copyright | 2023-09-22 | - |
| dc.date.issued | 2023 | - |
| dc.date.submitted | 2023-08-13 | - |
| dc.identifier.citation | (1) Jerkiewicz, G. Standard and Reversible Hydrogen Electrodes: Theory, Design, Operation, and Applications. ACS Catalysis 2020, 10 (15), 8409-8417. DOI: 10.1021/acscatal.0c02046.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90052 | - |
| dc.description.abstract | 光電化學水分解是一個熱門的研究領域，用於綠色能源的生成和儲存。儘管過渡金屬氧化物具有良好的操作穩定性，但這些材料的載子遷移率低、復合速率高，導致入射光子到電流的效率低，限制了商業化的潛力。在可用的光吸收材料中，釩酸鉍（BiVO4，簡稱BVO）是最適合光電化學水氧化反應的金屬氧化物光陽極。本研究旨在通過於氟摻雜二氧化錫（FTO）基板與BVO薄膜之間或上方沉積一層鐵電性鐵酸鉍（BiFeO3，簡稱BFO）層來增強BVO的載子傳輸效率。通過對鐵電性BFO層進行電晕極化形成能帶彎曲，於BVO/BFO界面處產生強電場來協助分離BVO層中的光生電子-電洞對。藉著使用線性掃描伏安法來評估光電化學效率的提高；然後應用電化學阻抗譜（EIS）和強度調變光電流/電壓譜（IMPS/IMVS）來解析BVO和BVO/BFO複合材料的傳輸和復合時間常數、擴散係數和衰減長度。在無外加偏壓的情況下，進行瞬態吸收(TAS)光譜測量，以獲得不同極化方向的BFO/FTO的載子動力學。研究發現，BFO的自發極化不僅可以改善BVO中的載子分離，還能在BFO本身中顯著改變載子動力學。總體而言，本研究證明，BFO鐵電性所造成之能帶彎曲可以有效改變BVO中的載子動力學。然而，BFO內的載子傳輸特性主導了此異質接面電極的光子到電流轉換效率。 | zh_TW |
| dc.description.abstract | Photoelectrochemical water splitting has been a vigorous field of research for the generation and storage of green energy. Although transition metal oxides exhibit decent operational stability, these materials also suffer from low carrier mobilities and high recombination rates, leading to low incident photon-to-current efficiencies and limited commercialization potential. Among the available light absorbers, bismuth vanadate (BiVO4, BVO) represents the best-performing metal oxide photoanode for PEC oxygen evolution reaction. This research aims to enhance the carrier transport efficiency of BVO by inserting a bismuth ferrite (BiFeO3, BFO) layer between or above a BVO thin film deposited on fluorine-doped tin oxide (FTO) substrate. Corona polling was performed to induce spontaneous polarization of the multiferroic BFO layer, with the aim of using the strong electric field at the BVO/BFO interface to assist the separation of photogenerated electron-hole pairs in the BVO layer. The enhancement in PEC efficiency was evaluated by linear sweep voltammetry; electrochemical impedance spectroscopy (EIS) and intensity modulated photocurrent/voltage spectroscopy (IMPS/IMVS) were then applied to deconvolute transport and recombination time constants, diffusion coefficients, and decay lengths for BVO, BFO, and BVO/BFO composite. Transient absorption spectroscopy (TAS) was conducted to obtain carrier dynamics of BFO/FTO with different polarization orientations in the absence of external bias. It was found that the spontaneous polarization of BFO can not only improve the carrier separation in BVO but also largely modifies the carrier dynamics within BFO itself. Overall, this work demonstrates that the ferroelectric band bending of BFO can efficiently alter the charge dynamics in the BVO. However, the carrier transport within BFO played a dominant role in affecting the photon-to-current conversion efficiency of the heterojunction electrode. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-09-22T17:12:54Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2023-09-22T17:12:54Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Contents
國立臺灣大學碩士學位論文口試委員會審定書 i 致謝 iii 摘要 iv Abstract v List of figures x List of tables xviii Chapter 1. Introductions 1 1.1 Photoelectrochemical water splitting 1 1.2 Selection criteria of photoelectrode material 3 1.2.1 Band alignment with electrolyte 3 1.2.2 Bandgap 4 1.2.3 Carrier transport, stability, and reactivity 4 1.3 BiVO4 photoanode for water splitting 6 1.4 Basic theory for ferroelectricity 8 1.4.1 Effects of ferroelectric spontaneous polarization on catalysis 12 1.5 Motivation for choosing ferroelectric BiFeO3 14 1.6 Impedance-Based Techniques 16 1.6.1 Basic circuitry 16 1.6.2 Impedance - Reactance & Resistance 17 1.6.3 The phasor approach for solving circuit impedance 18 1.6.4 Transfer function 19 1.6.5 Electrochemistry equivalent circuit components 20 1.6.6 Frequently used equivalent circuits in photoelectrochemistry 22 1.6.7 Electrochemical Impedance Spectroscopy 24 1.6.8 Intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) 27 1.6.9 Microscopic perspective of impedance techniques in terms of semiconductor physics 37 Chapter 2. Experimental Techniques and Principles 44 2.1 Chemical solution deposition 44 2.2 Characterization methods 45 2.2.1 X-ray Diffractometry 45 2.2.2 Raman Spectroscopy 46 2.2.3 UV-Vis Spectroscopy 47 2.2.4 X-ray Photoelectron Spectroscopy 49 2.2.5 Scanning Electron Microscopy 50 2.2.6 Piezoresponse Force Microscopy 51 2.3 Electrochemical methods 52 2.3.1 Linear Sweep Voltammetry 52 2.3.2 Mott-Schottky Analysis 54 2.3.3 Electrochemical impedance spectroscopy 56 2.3.4 Impedance-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) 56 Chapter 3. Fabrication and characterization of BiVO4 and BiFeO3 thin films 58 3.1 FTO substrate 58 3.1.1 Substrate pretreatment 58 3.1.2 FTO X-ray diffractogram 58 3.1.3 FTO substrate SEM image 59 3.1.4 FTO substrate UV-Vis spectrum 60 3.2 BiFeO3 thin film 61 3.2.1 BiFeO3 thin film fabrication 61 3.2.2 BiFeO3 thin film characterization 62 3.3 BiVO4 thin film 68 3.3.1 BiVO4 thin film fabrication 68 3.3.2 BiVO4 thin film characterization 69 3.4 BiVO4/BiFeO3/FTO and BiFeO3/BiVO4/FTO thin film characterization 72 3.4.1 X-ray diffractogram of BiVO4/BiFeO3/FTO and BiFeO3/BiVO4/FTO 72 3.4.2 SEM images 73 3.4.3 Raman and UV-Vis spectra 76 3.4.4 Piezoresponse force microscopy 77 3.5 X-ray Photoelectron Spectroscopy 79 3.5.1 O 1s spectra 79 3.5.2 Bi 4f spectra 81 3.5.3 Fe 2p spectra 82 3.5.4 V 2p spectra 83 Chapter 4. Electrochemical Performance 84 4.1 Electrode fabrication and polarity definition 84 4.1.1 Electrode Fabrication 84 4.1.2 Corona polling 84 4.1.3 Polarity definition 85 4.2 Linear Sweep Voltammetry 86 4.2.1 BVO/FTO 86 4.2.2 BVO/BFO/FTO of different poling polarity 89 4.2.3 BFO/BVO/FTO of different poling polarity 92 4.3 Mott-Schottky Analysis 98 4.3.1 BVO/FTO 98 4.3.2 BVO/BFO/FTO of different poling polarity 99 4.3.3 BFO/BVO/FTO of different poling polarity 101 4.4 Electrochemical Impedance Spectroscopy 103 4.4.1 Equivalent circuits 103 4.4.2 Comparison of BVO/FTO front/back illumination 105 4.4.3 Comparison of BVO/BFO8L/FTO with different poling polarity 108 4.4.4 Comparison of BFO6L/BVO8L/FTO with different poling polarity 112 Chapter 5. Carrier Dynamics Measurements 116 5.1 Intensity modulated photocurrent spectroscopy 116 5.1.1 BVO/FTO 116 5.1.2 BVO/BFO10L/FTO of different poling polarity 119 5.2 Intensity modulated photovoltage spectroscopy 125 5.2.1 BVO/FTO 125 5.2.2 BVO/BFO10L/FTO of different poling polarity 127 5.3 BFO Transient Absorption Spectroscopy of different poling polarity 135 5.3.1 Spectra at different delay time 135 5.3.2 Decay profile at specific wavelength 137 Conclusion 143 Appendix: X-ray absorption spectroscopy 144 XAS spectra of different polarity BFO/FTO thin films 144 Comparing oxidation states of powder standards and BFO thin films 145 EXAFS analysis in R-space 146 References 147 | - |
| dc.language.iso | en | - |
| dc.title | 鐵電性鐵酸鉍層對釩酸鉍光陽極催化水分解之影響 | zh_TW |
| dc.title | Photoelectrochemical Water Splitting by BiVO4 Photoanode Altered with Ferroelectric BiFeO3 | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 111-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 陳俊顯;陳浩銘;黃彥霖 | zh_TW |
| dc.contributor.oralexamcommittee | Chun-Hsien Chen ;Hao-Ming Chen;Yen-Ling Huang | en |
| dc.subject.keyword | 光電催化,過渡金屬氧化物,半導體載子動力學,阻抗方法, | zh_TW |
| dc.subject.keyword | photoelectrochemical catalysis,transition metal oxide,semiconductor carrier dynamics,impedance-based techniques, | en |
| dc.relation.page | 154 | - |
| dc.identifier.doi | 10.6342/NTU202304062 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2023-08-13 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 化學系 | - |
| 顯示於系所單位： | 化學系 | |
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