The voltammetric response of bipolar cells: Reversible electron transfer

Plana, Daniela; Jones, Fran G.E.; Dryfe, Robert A. W.

doi:10.1016/j.jelechem.2010.03.020

Cited by 46 publications

(43 citation statements)

References 27 publications

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“…Figure outlines our basic experimental setup. We form a closed BPE by electrically connecting two Pt disk microelectrodes, as has been previously reported . One pole of the BPE is placed in an analyte solution, and the other pole is placed in the optical reporter solution.…”

Section: Introductionmentioning

confidence: 99%

Electrogenerated Chemiluminescence Reporting on Closed Bipolar Microelectrodes and the Influence of Electrode Size

Oja

Zhang

2015

ChemElectroChem

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We report a fundamental study of the use of Ru(bpy)32+-based electrogenerated chemiluminescence (ECL) as an optical reporting system for the detection of redox-active analyte on closed bipolar microelectrodes, focused on gaining an in-depth understanding of the correlation between ECL emission intensity and electrochemical current. We demonstrate the significant effect that the size of the anodic and cathodic poles has on the resulting ECL signal and show how this influences the quantitative detection of analyte on a closed bipolar electrode. By carefully designing the geometry of the bipolar electrode, the detection performance of the system can be tuned to different analyte concentration ranges. We show that through a simple voltammetric study of the individual reactions, one can understand the coupled bipolar behavior and accurately predict the ECL signal response to a range of analyte concentrations, enabling the accurate prediction of calibration curves.

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Section: Introductionmentioning

confidence: 99%

Electrogenerated Chemiluminescence Reporting on Closed Bipolar Microelectrodes and the Influence of Electrode Size

Oja

Zhang

2015

ChemElectroChem

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“…25 As the cyclic voltammograms recorded here were acquired using a two electrode set up it is not possible to accurately define the exact potential at which the observed peaks occur; however we can approximate that, as the cell is symmetrical, both electrodes experience half of the magnitude of the applied potential. 29 As the applied potentials at which the peaks occur are ca. -0.25 and 0.25 V we can estimate that the potential differences across each electrode/electrolyte interface are ca.…”

Section: Open Cell Testingmentioning

confidence: 99%

Facile fabrication of metal–organic framework HKUST-1-based rewritable data storage devices

et al. 2016

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Metal-organic framework (MOF) HKUST-1 coated Cu electrodes synthesised by a quick and scalable anodic dissolution process and assembled into a sealed, symmetrical, two electrode coin cell configuration are shown to demonstrate redoxbased data storage behaviour. The observed behaviour is confirmed to be definitively due to the HKUST-1 itself as opposed to the underlying Cu/CuO electrode surface by demonstration of the same effect using HKUST-1/PVDF composite coated carbon fibre electrodes. This data storage behaviour is attributed to the immobilisation of a fixed number of electrically accessible active Cu cations within the porous HKUST-1 framework that are in the vicinity of the electrode surfaces and their ability to undergo facile Cu 2+/+ redox interconversion as a function of the potential applied across the electrodes. This proposed redox-based mechanism for the observed data storage effect has never previously been reported for MOF-based devices. Optimisation of electrolyte composition, electrolyte concentration and electrode separation results in "on"/"off" curent densitites of the order of 1 mA cm -2 , an "on":"off" ratio of ~ 5, "on"/"off" states stable to at least 10 consecutive reads, rewritability that persists over 6000 cycles, and the storage of data that can still be read hours after writing. The resulting data storage devices are more stable to successive reading and can be rewritten many more times than other previously reported pure MOF-based devices.

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“…FEEM uses a closed bipolar electrode [35][36][37][38][39] to electrically couple a conventional redox reaction of interest on one pole of the electrode to a fluorogenic reporter reaction on the opposite pole. 40,41 Under conditions where the reporter pole is not limiting, the rate of the conventional redox reaction can be monitored by optically monitoring the rate of the reporter reaction via fluorescence microscopy.…”

Section: Concentration Gradients Influence and Control Many Differentmentioning

confidence: 99%

Imaging Transient Formation of Diffusion Layers with Fluorescence-Enabled Electrochemical Microscopy

Oja

Zhang

2014

Anal. Chem.

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Fluorescence-enabled electrochemical microscopy (FEEM) is demonstrated as a new technique to image transient concentration profiles of redox species generated on ultramicroelectrodes (UMEs). FEEM converts an electrical signal into an optical signal by electrically coupling a conventional redox reaction to a fluorogenic reporter reaction on a closed bipolar electrode. We describe the implementation of FEEM for diffusion layer imaging and use an array of thousands of parallel bipolar electrodes to image the diffusion layers of UMEs in two and three dimensions. This new technique provides a way to image an entire 2-dimensional lateral cross section of a dynamic diffusion layer in a single experiment. By taking several of these lateral cross sections at different axial positions in the diffusion layer, a 3-dimensional image of the diffusion layer can be built. We image the diffusion layer of a 10 μm diameter carbon fiber electrode over the course of a cyclic voltammetry experiment and compare the FEEM-generated images to concentration profiles generated from numerical simulation. We also image the diffusion layer of a two electrode array consisting of two 10 μm diameter carbon fibers over the course of a potential step experiment.

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The voltammetric response of bipolar cells: Reversible electron transfer

Cited by 46 publications

References 27 publications

Electrogenerated Chemiluminescence Reporting on Closed Bipolar Microelectrodes and the Influence of Electrode Size

Electrogenerated Chemiluminescence Reporting on Closed Bipolar Microelectrodes and the Influence of Electrode Size

Facile fabrication of metal–organic framework HKUST-1-based rewritable data storage devices

Imaging Transient Formation of Diffusion Layers with Fluorescence-Enabled Electrochemical Microscopy

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