2017-07-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/682034摘要：本計畫將建立二維材料在能源應用研究的電子顯微鏡臨場觀察技術，以了解電化學反應過程 中材料的演變機制。二維材料在能源領域之應用上，包括本計畫成長之二維原子層材料及二維孔洞MOF材料，特別是在電池之應用上具有相當大之潛力。然而，了解其真正電化學之反應機制， 是目前科學界相當重要之議題。因此，建立臨場(In-Situ)觀察技術，特別是臨場電子顯微鏡觀察 (In-situ electron microscopy)是此領域相當重要之議題及挑戰。國內對於這方面的研究還在發展階 段。二維原子層材料(如 MoS2)的層狀結構特性，允許金屬離子在結構中快速遷移，因此極有潛力在未來應用於二次電池等儲能裝置中。目前文獻中的研究結果已證明此優異性質，然而對於儲能的機制仍有待更多的了解。二維材料的奈米結構特性適合以穿透式電子顯微鏡(TEM)進行觀察， 並分析電子能量損失光譜獲得成份資訊，本人在過去建構了可以施加電壓，用以觀察電極材料與電解液反應的 TEM 試片座，此裝置將運用於這項研究中，做臨場觀察。同時也將設計二維結構 臨場表面分析的觀察實驗，以掃描式歐傑電子能譜儀觀察電化學反應過程中，材料形貌、組成成 份、與結構的變化，以對電化學反應機制有更深入的了解。本研究將嘗試結合電子顯微影像與光譜分析技術於臨場觀察中，此分析技術未來也能應用於其他儲能材料系統，以及光電化學等能源應用研究中，建立先進的能源材料研究方式。<br> Abstract: This subproject focuses on the development of in-situ/operando transmission electron microscopy (TEM) observation methods for studying electrochemical reactions of two-dimensional atomic materials. Understanding electrochemical energy-conversion reactions in materials is important for designing better energy storage system. Two-dimensional materials, such as MoS2, exhibit layer structures, which allow rapid diffusion of metal ions in-between the layers. There materials are therefore very potential for applications in secondary batteries. The excellent performance of the secondary batteries based on the two-dimensional materials has been reported; however, the details of the charging/discharging mechanism in these materials are not clear yet. The small thickness of two-dimensional materials are very suitable for observations in TEM, and the chemical composition in these materials can be analyzed by electron energy loss spectroscopy in TEM. We have set up a liquid cell device that allows us to apply bias on materials in electrolytes and meanwhile perform real-time observations. This setup will be used in this research for in-situ observations. We also intend to design surface analytical method to perform real-time observation on two-dimensional materials, such as using Auger electron spectroscopy in a scanning electron microscope to study the morphology, structural evolution, and chemical reaction in two-dimensional materials. The in-situ analytical technique that combines TEM images and EELS will be developed in this study. It will also be applied to study other energy storage systems and photoelectrochemical reactions.二維材料穿透式電子顯微鏡臨場觀察電子能量損失圖譜儲能機制歐傑電子能譜儀Two-dimensional materialstransmission electron microscopyin-situ observationselectron energy loss spectroscopyenergy storage mechanismAuger electron spectroscopy