研究生: |
邱芸暄 Yun-Xuan Qiu |
---|---|
論文名稱: |
靜電紡絲製備鎳錳摻雜型硫氧化鋅/碳材複合纖維光催化劑於高效析氫應用 Electrospinned Ni- and Mn-doped zinc oxysulfide/ carbon microfibrous composite photocatalysts for highly efficient hydrogen evolution |
指導教授: |
郭東昊
Dong-Hau Kuo 王賈荃 Hairus Abdullah |
口試委員: |
郭東昊
Dong-Hau Kuo 柯文政 Wen-Cheng Ke 薛人愷 Ren-Kae Shiue |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2023 |
畢業學年度: | 111 |
語文別: | 中文 |
論文頁數: | 121 |
中文關鍵詞: | 靜電紡絲 、硫化鋅 、複合材料 、光催化水分解 |
外文關鍵詞: | Electrospinning, Zinc sulfide, Composite material, Photocatalytic water splitting |
相關次數: | 點閱:764 下載:0 |
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光催化是能克服能源短缺與全球暖化的技術之一,此技術已廣泛應用於產氫、二氧化碳還原、有機汙染物降解、生質能轉換等眾多應用,都是為環境議題尋找一個可靠又穩定的解決方案。然而,光催化劑需具備高活性、氧化還原能力及物質合成和轉換等目的,因此科學家紛紛尋找可增強光催化能力的方法。要實現光生電子-電洞對的有效分離以及隨後的能量轉移過程仍然具有挑戰性,為了克服此限制,可採取一些策略,例如金屬摻雜與p-n複合光觸媒,其係支持大規模應用的最簡便方法,且可降低電子-電洞對復合的機率。
本研究藉由靜電紡絲技術進行Ni與Mn金屬對低成本Zn(O,S)材料進行改質。利用X光繞射儀(XRD)、掃描式電子顯微鏡(SEM)、能量散射X-ray譜分析(EDS)、X射線光電子能譜(XPS)、穿透式電子顯微鏡(TEM)對所製備的Zn(O,S)複合纖維光催化劑進行物理與化學現象分析,此外,紫外/可見光漫反射光譜儀(DRS)、螢光光譜儀(PL)、電化學阻抗頻譜法(EIS)、瞬態光電流(TPC)、Mott-Schottky圖譜(MS)及循環伏安法(CV)用於光學及電特性分析。最後,用所製備的Ni摻雜Zn(O,S)和Ni摻雜Zn(O,S)/MnS2纖維複合材料進行光催化析氫反應。結果顯示,摻雜Ni可將氫氣產率提高至648.2 μmol g-1h-1,進一步使用摻雜Ni的 Zn(O,S)/MnS2 進行改質,由於p-n異質結構的形成,增強電荷分離,氫氣產率可達2036.4 μmol g-1h-1。
Photocatalysis is one of the sustainable technologies that can overcome energy shortages and global warming. This technology has been widely used in many applications, such as producing hydrogen, reducing carbon dioxide, degrading organic pollutants, and converting biomass to energy. It is all about finding a reliable and stable solution for environmental issues. However, photocatalysts must have high activity, redox ability, material synthesis, conversion, etc. Therefore, scientists are looking for ways to enhance photocatalytic ability. Effective separation of photogenerated electron-hole pairs and the subsequent energy transfer process are still challenges in photocatalysis. Some strategies can be adopted to overcome this limitation, such as metal doping and p-n composite photocatalyst, which are some of the most convenient methods to support a large-scale application. They can reduce the probability of electron-hole pair recombination.
This study uses an electrospinning method to modify a low-cost Zn(O,S) material with Ni and Mn metals. The as-prepared Zn(O,S)-based microfiber catalysts are identified with X-ray Diffractometer (XRD), Scanning Electron Microscopy (SEM), energy dispersive X-ray spectrum analysis (EDS), X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscope (TEM) to analyze its physical and chemical phenomena. Moreover, UV-VIS/NIR Spectrophotometer (DRS), photoluminescence (PL), Electrochemistry Impedance Spectroscopy (EIS), Transient Photocurrent (TPC), Mott-Schottky(MS), and Cyclic voltammetry (CV) are used to analyze optical and electrochemical properties. Finally, the photocatalytic hydrogen generation reaction is demonstrated with the as-prepared Ni-doped Zn(O,S) and Ni-doped Zn(O,S)/MnS2 composite microfibers. The results indicated Ni dopant could improve the hydrogen production rate to 648.2 μmol g-1h-1. Further modification with Ni-doped Zn(O,S)/MnS2 allows the hydrogen generation rate to achieve 2036.4 μmol g-1h-1 because the p-n heterojunction formation enhances the charge separation.
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