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研究組主要是探討表界面間電子轉移和能量傳遞的超快過程𓀑，包括光致反應、光電催化🤽、電化學反應等，研究其反應途徑與機理，以及生物酶蛋白的金屬氧化還原a8的功能結構。發展X射線譜學方法學（XAS🧑🏼🦳、XES、IXS）與實驗探測技術，研製高能量分辨X射線光譜儀（圖 1,2,3）。在同步輻射設施和X射線自由電子激光裝置應用X射線光譜技術，在原位反應條件下🪦🧜🏽♀️，結合時間分辨技術，配合第一原理計算，表征反應位點電子結構，進行能源材料的機理研究⭕️。
目前在研項目主要包括三個方面：（1）利用pump-probe探測技術研究光催化反應的電荷轉移動力學（圖 4,5,6）；（2）（光）電催化反應催化劑的製備👩🏽🏭、表征和機理研究（圖 7）🙃；（3）用於X射線光譜儀的元件和材料的製備研究（圖 8,9,10）。
圖 1：研製的高能量分辨X射線光譜儀
圖 2🤟🏻🧜🏽♂️：依托高能量分辨能譜儀發展的先進X射線譜學方法學
圖 3👨🌾：多維超快X射線譜學
圖 4：利用超快光譜技術研究量子點表面缺陷對電子轉移過程影響。（a）泵浦探測技術原理示意圖；（b）（c）CdSe QDs的瞬態吸收光譜。
圖 5🧑🏻✈️：（a）（b）在酸處理前後👩👧👦，測試ZnO中的 Zn L-edge和 O K-edge的XAS，證明了ZnO經酸處理後氧空位增多；（c）通用同步加速器超快泵浦探測束示意圖🌒。
圖 6👩🏿🦲：通過調控碳源和摻雜前驅體，合成具有UV- Visible波段的熒光發射的碳點。基於瞬態吸收光譜（TA）,研究碳點的碳核態🌛、表面缺陷態和分子態，在光催化體系下的電荷轉移動力學過程🐮🐙。
圖 7🏄🏽：采用電化學沉積的手段製備了高效能的電解水催化劑，利用XPS5️⃣，XAS等手段證明了Fe原子對Ni原子的價態的調控🧑🦽➡️，通過FTIR以及Raman光譜證明了羧酸自由基的存在🧚🏼，采用動力學同位素實驗證明在析氧反應中發生的質子耦合電子轉移過程⛄️。
圖 8👷🏻♀️：利用激光直寫光刻和反應離子束刻蝕實現可見光波段的金剛石光柵製備，實現核心刻蝕工藝的突破🌽。目前致力於金剛石離子束註入光刻的實現，實現高效率高準確度的金剛石光刻工藝🪘👐🏽。
圖 9：將矽/鍺/石英晶片壓彎並粘接在玻璃基底上，保證曲率半徑和表面形貌滿足使用條件。使用膠水粘合工藝🏃🏻➡️，完成半徑1000mm彎晶單色器的製備，且表面RMS、聚焦性能、曲率半徑等幾何面型參數與成品彎晶接近。
圖 10：利用脈沖激光沉積技術(Pulsed Laser Deposition)在襯底上沉積BiFeO3 (BFO)薄膜🐔，用XRD和RSM(Reciprocal Space Mapping），AFM技術來判斷薄膜生長的質量🥝，並采用C-AFM(Conductive-AFM)♾，PFM(Piezoresponse Force Microscopy)等方法來進行電學測試，同時結合課題組的XAS技術，研究BFO薄膜的晶體結構🏎，鐵電性以及反鐵磁性三者之間的耦合關系和其他獨特性質🌀。左圖為PLD技術示意圖，右圖為經過氫氟酸酸洗後得到的具有原子臺階的SrTiO3襯底表面的AFM測試結果🧎🏻。
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元春澤
副研究員
研究方向：光電催化反應動力學研究🧑🗃；電化學能源材料和金屬離子電池的研究🧑🏻⚕️。
郵箱 Email：yuanchz@shanghaitech.edu.cn
