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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳浩銘(Hao-Ming Chen) | |
dc.contributor.author | Hsuan-Yu Lin | en |
dc.contributor.author | 林宣佑 | zh_TW |
dc.date.accessioned | 2021-06-15T11:35:48Z | - |
dc.date.available | 2018-08-26 | |
dc.date.copyright | 2016-08-26 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-15 | |
dc.identifier.citation | 1. https://en.wikipedia.org/wiki/Energy_development
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49579 | - |
dc.description.abstract | 隨著環境保護的意識增長,氫氣作為一種乾淨的能量來源日益受到重視。以電化學催化水分解產氫產氧是一種生產氫氣的良好方法。然而,在整個電解系統中,產氧端產氧反應因為牽涉到四電子轉移,故其過電位 (overpotential) 往往較還原端產氫反應來的高,因此整個系統之效率會受限於氧化端。故如果針對氧化端之催化劑做優化則可以提升整體之效率。在氧化端人們常用較便宜且地球蘊含量較高的過渡元素氧化物替代較昂貴的二氧化釕及二氧化銥。其中,尖晶石結構 (spinel) 是一種兼具活性以及穩定性的材料,但過去人們對其電催化產氧反應之反應機構還不甚了解,本研究希望透過研究以鈷為基底的尖晶石結構對產氧反應之反應機構有更多的認識。
本研究中,利用共沉澱法合成一系列以鈷為基底之正結構尖晶石 (normal spinel) 催化劑,以研究在晶體結構中不同位置及價數的鈷離子對電催化產氧反應的影響。利用X光繞射儀及X光吸收光譜鑑定材料結構與金屬所在位置等基本性質,並以掃描式電子顯微鏡及穿透式電子顯微鏡觀測其形貌。電化學的量測顯示,2價鈷在整體活性上優於3價鈷且於量測時發生相變的現象。同時,透過臨場X光繞射儀發現,2價之鈷原子隨施加電壓增加會逐漸生成鈷氧氫氧化物 Co(O)OH (Cobalt Oxy-hydroxide),推測此生成物是主導尖晶石活性之關鍵。 | zh_TW |
dc.description.abstract | Electrochemically catalyzed water splitting reaction is a promising green energy source. The water splitting commonly involves two reactions, including Oxygen Evolution Reaction (OER) and Hydrogen Evolution Reaction (HER). However, the OER is more sluggish than HER because four electrons are involved in OER. Recently, many researches are working on spinel materials for OER because of the both high reactivity and good long-term stability. Nevertheless, the mechanism of spinel materials toward catalyzing OER is still unclear. Consequently, more studies are essential to figure out what the metal ion actually act in spinel catalyst.
In this work, we synthesized a series of spinel materials (AB2O4, A = Co, Zn; B = Co, Cr) via a co-precipitation method in order to find out which part of spinel can electrochemically catalyze OER. X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), scanning electron microscope (SEM), transmission Electron Microscopy (TEM) and Current-Voltage characterization were carried out to realize the mechanism behind the reaction. Finally, we proposed that both sites in spinel can’t catalyze OER directly. However, the Co2+ ion in spinel can transform into Co(O)OH which is a good catalyst for OER. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T11:35:48Z (GMT). No. of bitstreams: 1 ntu-105-R03223172-1.pdf: 5430576 bytes, checksum: f253581ca1ef5dd38fe121c7fea1f0eb (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 摘要 i
Abstract ii 致謝 iii 目錄 iv 圖目錄 vii 表目錄 x 第一章 緒論 1 1.1 前言 1 1.2 氫能源 1 1.2.1 石化燃料方法產氫 2 1.2.2 光電化學水分解產氫 (Photoelectrochemical Water Splitting, PEC) 2 1.2.3 水的電解產氫 3 1.3 水的電解之氧化端 5 1.3.1 以銥、銠為基底之共催化劑 5 1.3.2 氧化物作為氧化端催化物之反應機構 6 1.3.3 產氧反應過電位 8 1.3.4 3d過渡金屬氧化物產氧催化劑進展 11 1.3.5 3d過渡金屬非氧化物產氧催化劑進展 17 1.4 研究動機與目的 18 第二章 實驗步驟與儀器 19 2-1 化學藥品 19 2.2 催化劑之製備過程 21 2.2.1 (CoxZn1-x)Cr2O4系列尖晶石催化劑製備40 21 2.2.1 Zn(CoxCr2-x)O4尖晶石催化劑製備40 22 2.2.3 三電極電化學系統之工作電極製作 23 2.3 樣品之鑑定與分析 24 2.3.1 X光粉末繞射儀 (X-ray Powder Diffractometer; XRD) 25 2.3.2穿透式電子顯微鏡 (Transmission Electron Microscopy; TEM) 28 2.3.3掃描式電子顯微鏡 (Scanning Electron Microscope; SEM) 31 2.3.4能量散布X光光譜儀 (Energy Dispersive X-ray Spectrometer; EDS, EDX) 34 2.3.5同步輻射光源 (Synchrotron Radiation) 35 2.3.6電化學量測 40 2.3.7氣相層析儀 (Gas chromatography; GC) 45 第三章 結果與討論 48 3.1 合成樣品之晶相確認 48 3.2合成樣品中各元素比例確認 50 3.4 透過同步輻射光源之X光吸收光譜 (XAS) 輔助確認樣品性質 53 3.4.1 樣品中鈷原子之價數 53 3.4.2 樣品中金屬原子位置判斷 56 3.5 電化學量測 59 3.5.1 線性掃描伏安法 (LSV) 59 3.5.2 電化學活性表面積活性校正 61 3.5.3 活性隨掃描次數改變之觀察 63 3.5.4 樣品氧化還原峰之觀察 66 3.5.5 電化學阻抗量測 (EIS) 68 3.6 樣品法拉第效率之比較 70 3.7 產氧反應前後樣品變化觀察 72 3.8 產氧反應時樣品表面之變化 76 3.9 產氧反應發生時樣品變化之猜想 81 第四章 結論 84 附錄 參考文獻 85 | |
dc.language.iso | zh-TW | |
dc.title | 尖晶石結構催化劑於電催化產氧反應之研究 | zh_TW |
dc.title | Investigation of Oxygen Evolution Reaction by Spinel Materials | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 廖尉斯(Wei-Ssu Liao),羅世強(Shyh-Chyang Luo),李介仁(Jie-Ren Li) | |
dc.subject.keyword | 水分解反應,產氧反應,尖晶石, | zh_TW |
dc.subject.keyword | water splitting,oxygen evolution reaction,spinel, | en |
dc.relation.page | 91 | |
dc.identifier.doi | 10.6342/NTU201602765 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-08-17 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 化學研究所 | zh_TW |
顯示於系所單位: | 化學系 |
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