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研究生： 程柏諺
Cheng, Bo-Yan
論文名稱： 四氧化釩鉍-二氧化鈦異質奈米結構光陽極於光電化學分解水之應用
BiVO4-TiO2 Nanostructured Heterojunction Photoanode for Photoelectrochemical Water Oxidation
指導教授： 吳季珍
Wu, Jih-Jen
學位類別： 碩士
Master
系所名稱： 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年： 2015
畢業學年度： 103
語文別： 中文
論文頁數： 91
中文關鍵詞： 四氧化釩鉍 、二氧化鈦 、金屬有機物分解法 、異質奈米結構 、光陽極 、光電化學分解水
外文關鍵詞： BiVO4, TiO2, metal organic decomposition method, nanostructured heterojunction, photoanode, photoelectrochemical water oxidation
相關次數： 點閱：98  下載：2 
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    • 本研究以金屬有機物分解法成長四氧化釩鉍具孔洞性的薄膜，並將其應用於光電化學分解水。同時也以水熱法結合化學浴法先成長二氧化鈦層於導電玻璃基板，繼以沉積四氧化釩鉍，以建構二氧化鈦-四氧化釩鉍異質奈米結構。研究結果顯示，兩光電極在1.23V vs RHE，最高可達到0.8 mA/cm2 。當電壓高於1.23V後，二氧化鈦-四氧化釩鉍異質奈米結構光陽極，則具有較高之光電流。進一步以過氧化氫為電洞犧牲試劑分析得知，二氧化鈦-四氧化釩鉍電極電荷分離效率較四氧化釩鉍電極高，而電荷注入效率則較低。繼以電沉積法於二氧化鈦-四氧化釩鉍電極表面上成長共觸媒Co-Pi，起始電壓往左位移，且在1.23V vs RHE下光電流提升了104 %，可達1.61 mA/cm2。

    In this work, porous bismuth vanadate (BiVO4) thin film has been deposited on fluorine-doped tin oxide (FTO) by metal organic decomposition for the application to photoelectrochemical water splitting. Titanium oxide (TiO2) thin layer which is grown by combing hydrothermal method and chemical bath deposition is developed between FTO and BiVO4 for increasing the photocurrent density in photoelectrochemical water oxidation. The results show that an optimal TiO2-BiVO4 nanostructured heterojunction photoanode produces a photocurrent density of 0.8 mA/cm2 at a potential of 1.23V versus RHE under illumination of AM 1.5G (100 mWcm-2). By using hydrogen peroxide (H2O2) as a hole scavenger, it demonstrates that charge separation efficiency in the TiO2-BiVO4 photoanode is superior to that in the BiVO4 photoanode. However, charge injection efficiency in the TiO2-BiVO4 photoanode is lower than that in the BiVO4 photoanode. By depositing cocatalyst Co-Pi on the surface of TiO2-BiVO4 photoanode, the onset potential shift toward the cathodic direction. A 104 % increase of the photocurrent density at a potential of 1.23V versus RHE is measured in the Co-Pi/ TiO2-BiVO4 photoanode.

    摘要 II 誌謝 IX 目錄 XI 圖目錄 XV 表目錄 XX 第一章 緒論 1 1-1 前言 1 1-2 Honda-Fujishima Effect 3 1-3 研究動機 4 第二章 文獻回顧 6 2-1 光觸媒原理 6 2-1-1 光觸媒的催化原理 6 2-1-2 光分解水的原理 7 2-1-3 光觸媒分解水反應程序 9 2-1-4 光觸媒分解水裝置 10 2-2半導體光觸媒的介紹 12 2-3 光觸媒分解水 14 2-3-1 光觸媒電極作用原理 14 2-3-2 光觸媒電極種類 17 2-3-3 光觸媒電極之偏壓系統 20 2-4 四氧化釩鉍的結構與其半導體性質 22 2-5 四氧化釩鉍的合成方式 25 2-5-1金屬有機物分解法(Metal Organic Decomposition，MOD) 25 2-5-2電化學法(Electrochemical synthesis) 26 2-5-3氣相法(Gas phase synthesis) 27 第三章 實驗步驟與研究方法 28 3-1 實驗材料 28 3-2實驗儀器設備 30 3-2-1中低溫爐 30 3-2-2 高溫爐 30 3-2-3烤盤 31 3-2-4旋轉塗佈機 31 3-3實驗流程設計 32 3-4實驗步驟 33 3-4-1基板清潔 33 3-4-2水熱法和化學浴法成長二氧化鈦薄膜 33 3-4-3金屬有機物分解法成長四氧化釩鉍薄膜 34 3-4-4成長共觸媒Co-Pi 35 3-4-5四氧化釩鉍薄膜電極製備及量測 36 3-4-6 電荷分離效率與注入效率之量測 37 3-5分析儀器 38 3-5-1掃描式電子顯微鏡 (Scanning Electron Microscope，SEM) 38 3-5-2 X光繞射分析 39 3-5-3紫外光-可見光吸收光譜儀 (UV-Visible Absorption Spectrometer) 41 3-5-4拉曼分析儀 (Raman Spectroscopy) 43 3-5-5 太陽光模擬器 (Solar Simulator) 45 3-5-6恆電位儀 (Potentiostat) 46 第四章 結果與討論 47 4-1以金屬有機物分解法成長四氧化釩鉍薄膜 47 4-1-1反應物濃度對四氧化釩鉍薄膜的均勻性之影響 47 4-1-2熱裂解溫度對四氧化釩鉍薄膜均勻性之影響 51 4-1-3塗佈層數對四氧化釩鉍薄膜厚度與光吸收度之影響 53 4-2二氧化鈦-四氧化釩鉍異質奈米結構特性分析 58 4-2-1二氧化鈦奈米薄膜之成長與鑑定 58 4-2-2塗佈層數對二氧化鈦-四氧化釩鉍異質奈米結構光吸收度之影響 60 4-2-3二氧化鈦-四氧化釩鉍異質奈米結構之結構分析與鑑定 64 4-3四氧化釩鉍薄膜與二氧化鈦-四氧化釩鉍異質奈米結構於光電化學分解水之應用 67 4-3-1四氧化釩鉍薄膜之光電化學分解水特性 67 4-3-2二氧化鈦-四氧化釩鉍異質奈米結構之光電化學分解水之特性 68 4-3-3 四氧化釩鉍薄膜與二氧化鈦-四氧化釩鉍異質奈米結構光電化學特性之比較 70 4-3-3-1 光電化學分解水特性之比較 70 4-3-3-2光電轉換效率(IPCE)之比較 72 4-3-3-3 二氧化鈦於異質奈米結構應用於光電化學分解水之作用 73 4-3-4穩定性測試 78 4-3-5 表面電沉積共觸媒之效應 80 第五章 結論 84 第六章 參考文獻 86

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