In this work, a compact instrument for time-resolved luminescence spectroelectrochemistry using low-cost disposable electrodes is reported. This instrument can be coupled with screen-printed electrodes via a specific cell and a reflection probe, which allows one to observe changes occurring at the electrode/solution interface. This approach allowed one to follow the fluorescence variation of electrofluorochromic species such as [Ru(bpy)₃]²⁺ at screen-printed carbon electrodes. A strong correlation between the electrochemical processes and the fluorescence was found during potentiostatic or multipulsed amperometric measurements. A decrease of the fluorescence was observed when the [Ru(bpy)₃]²⁺ was oxidized to [Ru(bpy)₃]³⁺ and part of this fluorescence is recovered when [Ru(bpy)₃]³⁺ was reduced to the initial species. Moreover, a significant increment of the fluorescence was found when the oxygen reduction reaction takes place, which also confirms its quenching effect. Finally, multipulsed amperometric detection was employed in order to obtain more information about the redox-dependent luminescence of [Ru(bpy)₃]²⁺ finding a continuous quenching over time attributed to bleaching chlorine-based species.

中文翻译：

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丝网印刷电极上的时间分辨荧光光谱电化学：依赖于[Ru（bpy）₃ ] ²⁺的氧化还原依赖性荧光

在这项工作中，报告了一种使用低成本一次性电极的紧凑型仪器，用于时间分辨发光光谱电化学。该仪器可以通过特定的电池和反射探针与丝网印刷的电极耦合，从而可以观察在电极/溶液界面发生的变化。这种方法使人们可以在丝网印刷的碳电极上跟踪诸如[Ru（bpy）₃ ] ^2+之类的电致变色物质的荧光变化。在恒电位或多脉冲安培测量中发现了电化学过程与荧光之间的强相关性。将[Ru（bpy）₃ ] ²⁺氧化为[Ru（bpy）₃] ³⁺和[Ru（bpy）₃ ] ³⁺还原为初始物种时，部分荧光得以恢复。此外，当发生氧还原反应时，发现荧光显着增加，这也证实了其猝灭作用。最后，为了获得有关[Ru（bpy）₃ ] ²⁺的依赖于氧化还原的发光的更多信息，采用多脉冲安培检测法，发现随着时间的推移，连续的淬灭归因于基于氯的物质的漂白。