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研究生： 林承毅
Lin, Cheng-Yi
論文名稱： 探討氧化鋅奈米結構長寬比和氧缺陷對壓電產氫的影響
Probing the effects of aspect ratios and oxygen vacancies of ZnO nanostructures on piezocatalytic hydrogen production
指導教授： 呂明諺
Lu, Ming-Yen
口試委員: 郭俊宏
呂明霈
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年： 2021
畢業學年度： 110
語文別： 中文
論文頁數： 67
中文關鍵詞： 產氫反應 、氧化鋅 、長寬比 、氧缺陷 、有限元素模擬
外文關鍵詞： ratio, oxygen, vacancy, finite, element
相關次數： 點閱：2  下載：0 
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    • 隨著科技的進步，能源的使用已變成日常生活不可劃分的一部分，但目前碳循環能源的使用除有存量限制之外，還伴隨溫室效應等隱憂，為了更乾淨的能源，氫循環能源的發展是必要的，其中的問題包含如何以再生能源生產氫氣以及如何儲存氫氣。在產氫的發展中，催化產氫反應是主要的研究方向。本研究將以氧化鋅調控長寬比及氧缺陷量探討壓電產氫機制。
    本研究藉由調控前驅物的成份以及氫化反應得到不同長寬比及氧缺陷的氧化鋅，氫化時間最長的氧化鋅在不同長寬比，0.21、0.74及15.84下皆有最高的壓電產氫量，分別為378.25、557.55、857.4 μmol h-1 g-1，約比無氫化反應多2.5倍，影響的機制為氫化時間增加會提高氧缺陷量，而氧缺陷除能降低活化能外，還是反應點。此外，壓電產氫量變化隨著氫化時間的增加，維持與長寬比成正比的趨勢，最低與最高長寬比的產量維持約2倍的差異，由有限元素法模擬可知越高長寬比的氧化鋅有更高的壓電場，因此能推論壓電場大小是影響壓電產氫機制的重要因素。

    Energy issue becomes extremely important in our life. Owing to the development of technology. Since the carbon cycle energy induces the global warming, the demands for clear energy, such as hydrogen energy are increasing. However, the key challenges of hydrogen energy are the production and storage of hydrogen. Among the production methods, catalytic reaction is one of the promising approaches. This study utilized zinc oxide nanostructures with different aspect ratio and oxygen vacancies for piezo-catalytic hydrogen production.
    In this research, we tuned the synthesis parameters, such as the amounts of the precursors for hydrothermal method and hydrogenation time to obtain ZnO with different aspect ratio and oxygen vacancies. ZnO nanostructures with aspect ratios of 0.21, 0.74 and 15.84 have the optimized hydrogen production, 378.25, 557.55 and 857.4 μmol h-1 g-1, respectively after 6 hour hydrogenation. The hydrogen production after 6 hours hydrogenation is 2.5 times higher than the pristine ones, implying that the increasing amount of oxygen vacancies can improve the hydrogen production. Moreover, hydrogen production is corelated to aspect ratios. Finite element calculation was carried out, which proves that aspect ratios and piezoelectric potential are positive related.

    目錄 摘要 I Abstract II 致謝 III 目錄 IV 圖目錄 VI 表目錄 VIII 第一章 緒論與文獻回顧 1 1.1. 氫能源及水分解產氫反應 1 1.2. 壓電催化產氫機制 3 1.3. 犧牲劑在壓電催化水分解產氫反應扮演的角色 6 1.4. 長寬比對催化特性的影響 7 1.5. 陰離子缺陷對催化反應的影響 10 1.6. 壓電材料 12 1.6.1. 氧化鋅 12 1.6.2. 鈣鈦礦(Perovskites) 13 1.6.3. 二維材料 13 1.7. 氧化鋅奈米材料基本性質與合成 15 1.7.1. 氧化鋅合成方法 15 1.7.2. 氧化鋅結構氧缺陷調控 20 1.7.3. 氫化反應 21 1.8. 研究動機 22 第二章 實驗步驟 23 2.1. 實驗架構與步驟 23 2.1.1. 實驗架構 23 2.1.2. 水熱法合成氧化鋅奈米結構 24 2.1.3. 真空爐管進行氫化反應 25 2.1.4. 壓電催化水分解產氫反應 26 2.1.5. 有限元素法壓電場模擬 27 2.2. 儀器介紹 28 2.2.1. 掃描式電子顯微鏡(Scanning electron microscopy, SEM) 28 2.2.2. X光繞射分析(X-Ray diffraction spectroscopy, XRD) 29 2.2.3. 穿透式電子顯微鏡(Transmission electron microscopy, TEM) 30 2.2.4. 光致螢光 (Photoluminescence spectroscopy, PL) 光譜 31 2.2.5. X光電子能譜(X-ray photoelectron spectroscopy, XPS) 32 2.2.6. 氣相層析儀(Gas chromatography, GC) 33 第三章 結果與討論 34 3.1. 氧化鋅奈米結構分析 34 3.1.1. SEM影像分析 34 3.1.2. 氫化前後氧化鋅形貌比較 35 3.1.3. XRD光譜分析 36 3.1.4. TEM影像分析 37 3.2. 氧化鋅奈米結構缺陷分析 44 3.2.1. PL光譜分析 44 3.2.2. XPS能譜分析 46 3.3. 壓電產氫反應 49 3.4. 壓電場有限元素法模擬 53 3.5. 產氫反應比較 58 第四章 結論 59 第五章 未來展望 60 參考文獻 62

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