Electrochemiluminescence at 3D Printed Titanium Electrodes
The fabrication and electrochemical properties of a 3D printed titanium electrode array are described. The array comprises 25 round cylinders (0.015 cm radius, 0.3 cm high) that are evenly separated on a 0.48 × 0.48 cm square porous base (total geometric area of 1.32 cm 2 ). The electrochemically ac...
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Published in | Frontiers in chemistry Vol. 9; p. 662810 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Frontiers Media S.A
25.05.2021
|
Subjects | |
Online Access | Get full text |
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Summary: | The fabrication and electrochemical properties of a 3D printed titanium electrode array are described. The array comprises 25 round cylinders (0.015 cm radius, 0.3 cm high) that are evenly separated on a 0.48 × 0.48 cm square porous base (total geometric area of 1.32 cm
2
). The electrochemically active surface area consists of fused titanium particles and exhibits a large roughness factor ≈17. In acidic, oxygenated solution, the available potential window is from ~-0.3 to +1.2 V. The voltammetric response of ferrocyanide is quasi-reversible arising from slow heterogeneous electron transfer due to the presence of a native/oxidatively formed oxide. Unlike other metal electrodes, both [Ru(bpy)
3
]
1+
and [Ru(bpy)
3
]
3+
can be created in
aqueous
solutions which enables electrochemiluminescence to be generated by an annihilation mechanism. Depositing a thin gold layer significantly increases the standard heterogeneous electron transfer rate constant, k
o
, by a factor of ~80 to a value of 8.0 ± 0.4 × 10
−3
cm s
−1
and the voltammetry of ferrocyanide becomes reversible. The titanium and gold coated arrays generate electrochemiluminescence using tri-propyl amine as a co-reactant. However, the intensity of the gold-coated array is between 30 (high scan rate) and 100-fold (slow scan rates) higher at the gold coated arrays. Moreover, while the voltammetry of the luminophore is dominated by semi-infinite linear diffusion, the ECL response is significantly influenced by radial diffusion to the individual microcylinders of the array. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Edited by: Neso Sojic, Université de Bordeaux, France Reviewed by: Emily Maria Kerr, Deakin University, Australia; Zhifeng Ding, Western University, Canada; Federico Polo, Ca' Foscari University of Venice, Italy This article was submitted to Electrochemistry, a section of the journal Frontiers in Chemistry |
ISSN: | 2296-2646 2296-2646 |
DOI: | 10.3389/fchem.2021.662810 |