| 研究生: |
白琦 Pai, Chi |
|---|---|
| 論文名稱: |
硒類與錸類化合物在離子液體中的電化學性質探討 Electrochemical Studies of Selenium and Rhenium Compounds in the Ionic Liquids |
| 指導教授: |
孫亦文
Sun, Yi-Wen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 178 |
| 中文關鍵詞: | 離子液體 、電沉積 、硒和硒化鋅 、錸化合物 |
| 外文關鍵詞: | Ionic liquid, Elelctrodeposition, Selenium and Zinc selenide, Rhenium compound |
| 相關次數: | 點閱:82 下載:1 |
| 分享至: |
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利用電化學(CV)和光譜(UV/VIS、XAS)的技術將氧化硒(SeO2)和氯化硒(SeCl4)在室溫離子液體(EMIC-BF4)中的配位模式求出。另外兩個硒類前驅物在EMIC-BF4中的電化學行為會受到Cl-離子濃度、硒元素的形態不同而影響。在接近室溫下(40oC),藉由XRD、SEM 的技術比較兩前驅物(SeO2、SeCl4)在不同還原電位生成的硒元素形貌和性質上的差異。
在離子液體(ZnCl2-EMIC)中,利用添加氧化物(Na2CO3、SeO2)的方式證實了在離子液體中SeCl4 確實會和氧產生反應,進而影響到在離子液體中的電化學行為。另外在40–60 mol% ZnCl2-EMIC 的離子液體中,利用成本較低的氧化硒(SeO2)作為電沉積硒(Se)和硒化鋅(ZnSe)半導體的前驅物。藉由電定位法發現在鎢電極上,Se4+還原到Se0的成核機制為瞬時成核。將Se4+經由4個電子還原成Se0後,若繼續還原到Se2-離子,將會和溶液中的Zn2+離子產生化學反應形成ZnSe。對於影響電沉積硒(Se0)和硒化鋅(ZnSe)的參數像是溫度、還原電位進行研究。電沉積樣品表面的形貌、成分和晶型結構以掃描式電子顯微鏡(SEM)、能量分散光譜儀(EDS)、X繞射分析儀(XRD)、穿透式電子顯微鏡(TEM)進行結構分析。
從UV/VIS吸收光譜的實驗指出K2ReCl6 溶解進入EMI-BF4 中,依然會是以[ReCl6]2- 的配位形式存在,並且[ReCl6]2- 在EMI-BF4 中氧化到Re5+ 和還原到Re3+ 皆是半可逆的單電子轉移。[ReCl6]2- 在EMI-BF4 中,標準異質化速率常數(ko)、還原轉移系數(σ),分別為1.11x10-3 cm/s 、0.45。藉由Nernst Plots可求出[ReCl6]2- 在EMI-BF4 中,確實是以1個電子的氧化致[ReCl6]- 。另一方面計算還原電解[ReCl6]2- 在EMI-BF4 中所得的結果接近2個電子,並且在還原電解的過程,一莫爾的[ReCl6]3- 會釋放出一莫爾的Cl- 離子,並產生雙聚體化的反應發生。還原過程中所發生的反應可藉由循環伏安法、庫倫法和拉曼光譜圖幫助說明。當DCA- 陰離子存在於EMI-BF4 中時,還原電解[ReCl6]2-所得到的結果與不含DCA- 的結果不同,除了上述反應(釋放出Cl- 離子和雙聚體化)會發生外,還原產物還會和DCA- 產生錯核反應,形成包含DCA- 配位基的Re雙聚體化合物。
When selenium dioxide(SeO2) and selenium tetrachloride(SeCl4) dissolved in room temperature ionic liquids (EMIC-BF4), the coordination mode of these two precursor in ionic liquid can be determined by electrochemical (CV) and spectroscopic (UV/VIS,XAS) methods. The electrochemical behavior of [SeO2Cl]- and [SeCl6]2- in EMIC-BF4 were influenced by chloride ion(Cl-) concentration and the nature of selenium . In addition, near the room temperature (40oC), using XRD, SEM technology to comparison the morphology and the nature of selenium at different reduction potential of these two precursors (SeO2, SeCl4).
The electrochemical behavior of SeCl4 in ionic liquids (40-60 mol% of ZnCl2- EMIC) is very sensitive to oxygen confirmed by adding some oxides (Na2CO3, SeO2). Also, we are choosing lower cost of the selenium dioxide(SeO2) as a precursor to elelctrodeposit of Se and ZnSe semiconductor in the 40-60 mol% of ZnCl2- EMIC ionic liquid. The chronoamperometric result indicates that deposition of Se at tungsten substrate under three-dimensional instantaneous nucleation. Initially, the deposition of Se0 proceeds by four electron reduction of Se4+ to Se0, then further reduced to Se2- which chemically react with Zn2+ to produce ZnSe. The deposition parameters like temperature, reduction potential are discussed. The surface morphology, composition and crystal structure are studied with X-ray diffraction(XRD), Energy-dispersive spectroscopy(EDS) and scanning electron microscope(TEM).
UV/VIS absorption spectrum pointed out that the species of K2ReCl6 in the EMI-BF4 is [ReCl6]2-, would not influence by the weak ligand (BF4-) in the ionic liquid. The CV shows that [ReCl6]2- can be oxidized to Re5+ and reduced to Re3+ via quasi reversible one-electron charge transfer process. The standard heterogeneous rate constant(ko), anodic transfer coefficient(σ), were 1.11x10-3 cm/s , 0.45. [ReCl6]2- in the EMI-BF4 is indeed via one electron oxidation to [ReCl6]- obtain from Nernst Plot . On the other hand, calculation the needed coulomb quantity to reduction of [ReCl6]2-, the result shows that nearly two electrons. At the reduction electrolysis process, [ReCl6]3- will release a Cl- ions and occurring the dimmerization reaction forming dimmer, the proof of this phenomenon are Cyclic Voltammetry, Coulometry and Raman spectra. On other hand, when DCA- anion present in the EMI-BF4, the result of reduction electrolysis is totally different from the reduction results without DCA- ion present in the EMI-BF4. Beside to the above reaction (release of Cl- ions and dimmerization), the reduce product will also complex with DCA- ligand, formation of Re dimmer compound that containing DCA- as a ligand.
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