Time-Resolved Luminescence Spectroelectrochemistry
at Screen-Printed Electrodes: Following the Redox-Dependent Fluorescence
of [Ru(bpy)<sub>3</sub>]<sup>2+</sup>
Daniel Martín-Yerga
Alejandro Pérez-Junquera
David Hernández-Santos
Pablo Fanjul-Bolado
10.1021/acs.analchem.7b01734.s003
https://acs.figshare.com/articles/media/Time-Resolved_Luminescence_Spectroelectrochemistry_at_Screen-Printed_Electrodes_Following_the_Redox-Dependent_Fluorescence_of_Ru_bpy_sub_3_sub_sup_2_sup_/5435092
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)<sub>3</sub>]<sup>2+</sup> 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)<sub>3</sub>]<sup>2+</sup> was oxidized
to [Ru(bpy)<sub>3</sub>]<sup>3+</sup> and part of this fluorescence
is recovered when [Ru(bpy)<sub>3</sub>]<sup>3+</sup> 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)<sub>3</sub>]<sup>2+</sup> finding a continuous
quenching over time attributed to bleaching chlorine-based species.
2017-09-11 00:00:00
Ru
multipulsed amperometric measurements
screen-printed carbon electrodes
electrofluorochromic species
electrochemical processes
multipulsed amperometric detection
Time-Resolved Luminescence Spectroelectrochemistry
oxygen reduction reaction
redox-dependent luminescence
quenching effect
chlorine-based species
fluorescence variation
screen-printed electrodes
Redox-Dependent Fluorescence
reflection probe
Screen-Printed Electrodes
time-resolved luminescence spectroelectrochemistry