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Time-Resolved Luminescence Spectroelectrochemistry at Screen-Printed Electrodes: Following the Redox-Dependent Fluorescence of [Ru(bpy)3]2+
journal contribution
posted on 2017-09-11, 00:00 authored by Daniel Martín-Yerga, Alejandro Pérez-Junquera, David Hernández-Santos, Pablo Fanjul-BoladoIn
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.
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Rumultipulsed amperometric measurementsscreen-printed carbon electrodeselectrofluorochromic specieselectrochemical processesmultipulsed amperometric detectionTime-Resolved Luminescence Spectroelectrochemistryoxygen reduction reactionredox-dependent luminescencequenching effectchlorine-based speciesfluorescence variationscreen-printed electrodesRedox-Dependent Fluorescencereflection probeScreen-Printed Electrodestime-resolved luminescence spectroelectrochemistry
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