新式夹心型光透薄层光谱电化学电解池

本文设计了一种新式夹心型光透薄层紫外-可见光谱电化学池。该池采用铂网工作电极,两侧平行放置铂片为对极置于同一石英窗口夹层中,同时以聚四氟乙烯隔离膜作为边际限制器,结合池内小孔道设置内参比点进行精确的电位控制,具有理想的光谱电化学响应。利用循环伏安、循环电位-吸收、恒电位现场光谱、双电位跃-计时电量、双电位跃-计时吸收等技术,对铁氰化钾在氯化钾溶液中的行为进行了表征。

A NOVEL SANDWICH OPTICALLY TRANSPARENT THIN-LAYER SPECTROELECTROCHEMICAL CELL

An optically transparent platinium minigrid thin-layer spectroelectrochemical cell (OTTLSEC) with two platinium plates at each side of working electrode(WE) as auxiliary electrodes was designed and constructed. The WE, AE and two quartz plates form a "sandwich" with teflon film as the eliminator for minimizing the edge diffusional effect, A small inner channel sets an internal reference point for accurate potential control. Symmetrical thin-layer cyclic voltammograms with negligible peak-to-peak separation were obtained by this cell for ferri/ferrocyanide couple at low scan rates. The excellent optical and electrochemical responses of this couple in the cell by cyclic voltammetry, cyclic voltaabsorptometry, constant potential control in situ spectrum, double potential step-chronoabsorptometry and double potential step-chronocoulometry were achieved.