電催化原位紅外附件

                  圖1：原理示意圖      

電化學原位紅外光譜分析是紅外分析技術的一個重要分支，能夠定性分析電催化(如CO2電還原等)反應、各種類型電池(如鋰離子、鋰硫電池等)充放電過程中電極表面的產物或中間產物隨時間(電位)不斷變化的趨勢，是研究電化學反應機理以及電化學反應動力學的重要手段之一。

一 基本原理：

內反射模式:

(1)在單晶硅(Si)上化學鍍或真空鍍一層納米金膜，納米金屬膜具有表面增強效應。

(2)納米金膜可作為導電基底，在導電基底上滴涂或電沉積上電催化劑，作為工作電極。

(3)表面增強紅外，可得到電催化劑吸附態產物以及中間產物信息。

 圖2：內反射模式基本原理

外反射模式:

(1)在基底電極(如GCE)表面電沉積或滴涂電催化劑作為工作電極。

(2)工作電極距離晶體的距離可以調節。

(3)晶體可選Ge，ZnSe，CaF₂，Si等。

圖3：外反射模式基本原理

二 附件組成：

(1)紅外光譜儀主機適配底板,適配主流紅外光譜儀。

(2)平面鏡加曲面鏡。

(3)入射角度調節系統。

(4)衰減全反射晶體。

(5)玻璃電化學池(單池或H型池)以及PEEK外反射池。

(6)電極(玻碳電極、對電極、參比電極)。

(7)距離調節系統。

三 主要特點：

(1)可變入射角光學臺，30-80度連續可調，以保證不同電催化劑處于最大光通量狀態。

(2)衰減全反射晶體上具有一層增透膜，光通量增大10％以上

(3)電化學池密封性能好，可通入反應氣體。

(4)晶體拆卸簡單，方便打磨清洗。

(5)晶體種類可選，如Si，CaF₂，ZnSe等。

(6)電化學單池或H型池，切換方便。

(7)提供現場技術服務。

(7)可根據客戶需求定制反應池并提供可行性方案。

四  ATR Crystal characteristics for FTIR sampling

 
應用案例

CO₂電還原 J. Am. Chem. Soc.2022, 144, 259?269

氧氣析出反應 J. Am. Chem. Soc. 2022, 144, 21, 9271–9279

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