Ru(bpy)^2^+~3-C2O^2^-~4-PtE体系的两条电致化学发光通道

运用电位分辨电致化学发光(PRECL)手段发现Ru(bpy)^2^+~3-C2O^2^-~4-PtE体系在预氧化的多晶铂电极上存在两个发光通道，这两个通道分别位于1.22V和1.44V处，对影响两发光通道的条件进行了研究，比较了几种经过不同预处理方式(直接抛光、阳极极化和阴极极化的电极以及S吸附电极)以及体系中不同C2O^2^-~4浓度，pH，溶解氧和溶解二氧化碳对两PRECL峰形、峰强度的影响。提出第二个ECL发光峰的机制为C2O^2^-~4直接电极氧化产物CO^-^.~2(或C2O^-^.~4)的催化发光。

Two electrochemiluminescence pathways of Ru(bpy)^2^+~3/C2O^2^-~4 system on platinum electrode

Two anodic electrochemiluminescence (ECL) pathways were resolved at Ru(bpy)^2^+~3/C2O^2^-~4 system on Pt electrodes, correspondign to two anodic potential resolved ECL peaks observed at 1.22V (vs. SCE) (peak 1) and 1.40V (peak 2), respectively. The location and intensity of these peaks were characterized by the different method of pretreatment of the Pt electrode, including polishing, pre- deoxidizing, pre-oxidizing sulfur modification, as well as the effect of C2O^2^-~4 concentration, medium pH, dissolved O2 and dissolved CO2. The mechanism of ECL peak 2 was proposed as the catalytic luminescence of CO^-^.~2 (or C2O^-^.~4) generated from direct electrode-oxidation of C2O^2^-~4.