Understanding Voltammetry

Compton, Richard G.; Batchelor‐McAuley, Christopher; Dickinson, Edmund J. F.

doi:10.1142/p783

Cited by 318 publications

(193 citation statements)

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“…3) electron transfer redox probes, where in the former the voltammetric behaviour is characteristic of a macro-electrode 15 while the latter exhibits a response associated with that of a micro-electrode. 15 In order to try and gain further insights, we utilised Energydispersive X-ray spectroscopy (EDX) on a Scanning Electron Microscope (SEM) and mapped an area within the centre of the bare nickel and CVD-graphene electrodes. Analysis of the bare Ni electrode exhibited a uniform EDX signature indicating the presence of 100% atomic nickel throughout the sample, as expected.…”

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confidence: 99%

CVD graphene electrochemistry: the role of graphitic islands

Brownson

Banks

2011

Phys. Chem. Chem. Phys.

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confidence: 99%

CVD graphene electrochemistry: the role of graphitic islands

Brownson

Banks

2011

Phys. Chem. Chem. Phys.

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“…For this purpose, the time dependent current response of reaction of TMB for a fixed potential step, E = 0.15 V, was recorded in case of no reaction occurrence on the surface at the beginning of the experiment. The diffusion coefficient estimated as 9.43± 0.74 × 10 −6 cm 2 /s using the Shoup and Szabo's approximated expression [40], [42]. This value is three-fold larger than the one calculated as 3.11 × 10 −6 cm 2 s −1 using the Wilke and Chang semiempirical formula in the study of Baldrich et al [30].…”

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confidence: 69%

“…5). In both reversible and irreversible reactions, there is a square root dependence of the scan rate on the acquired peak current [40]. Cyclic voltammograms of TMB oxidation in the presence of H 2 O 2 for different scan rates demonstrated that the peak current is linearly proportional to the square root of scan rate (Fig.…”

Section: ) Detection Of Tmbmentioning

confidence: 92%

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A Fully Microfabricated Electrochemical Sensor and its Implementation for Detection of Methicillin Resistance in <italic>Staphylococcus Aureus</italic>

et al. 2014

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On-chip detection of biological analytes can enable diagnosis at the point of care. Combining the advantages of microelectromechanical system (MEMS) technology and molecular methods, we present the design of an integrated microfluidic platform, a microelectrochemical sensor (µECS), and its implementation for the detection of methicillin resistance in Staphylococcus aureus. This platform is capable of electrochemically sensing the target analyte in a microfluidic reactor without the usage of bulky electrodes, rendering it useful for in vitro diagnostics. In our experiments, the functionality of the sensor was tested for detecting specific DNA sequences of mecA gene (an indicator of methicillin resistance) over a range of concentrations of DNA (down to 10 pM). Synthetic oligonucleotides and bacterial PCR product were used as a target analyte in Hoechst 33258 marker-based detection and horseradish peroxidase-based detection, respectively. The results revealed that this platform has high sensitivity and selectivity. Also, its compatibility to MEMS processes enables its use with different applications ranging from detecting various types of cancers to endemics. The designed µECS can enable the detection of biological analytes of interest at low cost and high throughput.

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“…6,31 Consequently, the CNT constituted electrode array should behave as a planar electrode with an effective area equal to the projected area. 7 However, it was noted that the estimated A calculated from the relationship for i p was greater than the projected area of a typical sample (wafer diced to 0.25 cm 2 ). Noting that the relation was derived assuming semi-infinite linear diffusion equations with flux balance of species at the electrode interface, the obtained A would then seem to imply non-planar diffusion processes.…”

Section: Resultsmentioning

confidence: 96%

Electrochemical Characteristics of Closely Spaced Defect Tuned Carbon Nanotube Arrays

Hoefer

Bandaru

2013

J. Electrochem. Soc.

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The ability to understand the role of defects in nanostructures, such as carbon nanotubes (CNTs), is crucial for determining their utility in many applications. We analyze the improvement in electrochemical performance of multi-walled CNT arrays that were exposed to argon and hydrogen based plasmas, where it was hypothesized that locally charged defects could be created through exposure to ions in the plasma. Such defects would influence the graphitic structure and were monitored through Raman spectroscopy. Cyclic voltammetry and associated electrochemical techniques were employed to infer the effects of plasma exposure on electrochemical charge transfer. It was seen that the effective area of charge transfer could be reproducibly increased through argon plasma exposure by ∼100%, while exposure to hydrogen based plasmas resulted in decrease in the effective area by nearly 60%, under the investigated conditions. Our experiments indicate enhanced faradaic currents, involving non-planar diffusion processes of the electroactive species, with implications for enhanced charge and energy storage.The need for high energy density materials continually increases with the proliferation of portable electronics and energy harvesting devices. In this article, we present principles and methodologies, through which the energy density of electrochemical devices can be further enhanced, and thus applicable to the design of new generations of battery 1,2 and capacitor 3-5 architectures. Broadly, our study involves the purposeful addition of defects, which promote electrochemical reactions by increasing the effective area for charge transfer. The layered structure of graphite/multi-walled carbon nanotubes (CNTs), constituted of edge and basal planes, provides an excellent basis for such studies as it is well known 6,7 that edge plane like defects have a electrochemical rate constant of up to five orders of magnitude 8 greater than that of the latter constituent and that their ratio could be manipulated for altering electron transfer kinetics. We indicate that the implications may be more profound in terms of charge configuration and storage, e.g., dangling bonds resident on edge plane like defects may serve for enhancing the charge and energy density. We then explore themes where the fractions of defects resembling the edge plane may be created and relatively easily tuned. CNT arrays were found particularly appealing as they afford a large area over which such effects can be monitored and averaged.For this purpose, multi-walled CNT arrays were synthesized on electrically conducting silicon wafers through thermal chemical vapor deposition (CVD). The CNTs were subsequently exposed to argon and hydrogen based plasmas, where it was hypothesized that locally charged defects could be created through exposure to ions in the plasma. Such defects would influence the graphitic structure, 9 e.g., through electron and phonon renormalization. 10 A manifestation of charge transfer related to the CNTs was observed in Raman spectroscopy, through sh...

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Understanding Voltammetry

Cited by 318 publications

References 0 publications

CVD graphene electrochemistry: the role of graphitic islands

CVD graphene electrochemistry: the role of graphitic islands

A Fully Microfabricated Electrochemical Sensor and its Implementation for Detection of Methicillin Resistance in <italic>Staphylococcus Aureus</italic>

Electrochemical Characteristics of Closely Spaced Defect Tuned Carbon Nanotube Arrays

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