Nanoparticle modified electrodes: Surface coverage effects in voltammetry showing the transition from convergent to linear diffusion. The reduction of aqueous chromium (III) at silver nanoparticle modified electrodes

Zhou, Yi‐Ge; Campbell, Fallyn W.; Belding, Stephen R.; Compton, Richard G.

doi:10.1016/j.cplett.2010.08.012

Cited by 27 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[154] Due to the complex interplay between the electrode surface geometry and the diffusion profile as outlined above, extraction of physically significant kinetic data from modified electrodes is an onfacile problem. To experimentally evidence this point, the one electron reduction of chromium(III) [155] has been studied at as ilver-nanoparticle-modified electrode and as ilver macroelectrode, demonstrating clearly how the voltammetric response varies as af unctiono fn anoparticle surfacec overage. It should also be commented that normalisation of voltammetric results relative to the total electroactivea rea is also insufficient to, in many cases, allow even a qualitative comparison of data.…”

Section: Section 7: Nanoparticle Voltammetrymentioning

confidence: 99%

Recent Advances in Voltammetry

et al. 2015

Self Cite

View full text Add to dashboard Cite

Recent progress in the theory and practice of voltammetry is surveyed and evaluated. The transformation over the last decade of the level of modelling and simulation of experiments has realised major advances such that electrochemical techniques can be fully developed and applied to real chemical problems of distinct complexity. This review focuses on the topic areas of: multistep electrochemical processes, voltammetry in ionic liquids, the development and interpretation of theories of electron transfer (Butler–Volmer and Marcus–Hush), advances in voltammetric pulse techniques, stochastic random walk models of diffusion, the influence of migration under conditions of low support, voltammetry at rough and porous electrodes, and nanoparticle electrochemistry. The review of the latter field encompasses both the study of nanoparticle-modified electrodes, including stripping voltammetry and the new technique of ‘nano-impacts’.

show abstract

Section: Section 7: Nanoparticle Voltammetrymentioning

confidence: 99%

Recent Advances in Voltammetry

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, electrodes modified with gold nanoparticles (AuNPs) show unique catalytic properties that depend on the AuNP size and on the nature of the protecting groups. In addition, AuNPs provide a large surface area for the detection of analytes, leading to electrochemical sensors with lower detection limits [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Synergistic electrocatalytic effect of nanostructured mixed films formed by functionalised gold nanoparticles and bisphthalocyanines

Medina-Plaza

Furini

Constantino

et al. 2014

Analytica Chimica Acta

View full text Add to dashboard Cite

“… 45 Using the I p = n 2 F 2 A Γυ/4 RT equation in which Γ is the surface coverage of the electrode, and using the slope of the I p –υ plot in Figure 3 A, the Γ value for the modified NiO-CPE was about 2.74 × 10 –5 mol NiO per cm 2 . 77 − 79 …”

Section: Resultsmentioning

confidence: 99%

Cyclic and Linear Sweep Voltammetric Studies of a Modified Carbon Paste Electrode with Nickel Oxide Nanoparticles toward Tamoxifen: Effects of Surface Modification on Electrode Response Kinetics

2022

View full text Add to dashboard Cite

Due to the serious adverse futures of some anticancer drugs, the determination of trace amounts of these drugs by simple analytical techniques is of great interest. In this regard, knowing about the mechanism of the analyte with the sensing material plays an important role. Nickel oxide nanoparticles (NiO NPs) modified by a carbon paste electrode (NiO-CPE) showed an irreversible cyclic voltammetric (CV) behavior in the NaOH (pH 13) supporting electrolyte based on the peak separation of 311 mV. Its peak current was decreased by adding tamoxifen (TAM), confirming that TAM molecules can consume NiO before participating in the electrode reaction. For this goal, TAM can be oxidized or reduced, and the corresponding mechanisms are schematically illustrated in the text. This study focused on the kinetic aspects of the process. Based on the CV results, a surface coverage (Γ) value of 2.72 × 10 –5 mol NiO per cm 2 was obtained with charge transfer coefficients α a and α c of 0.317 and 0.563, respectively. α a and α c values were changed to 0.08 and 0.72 in the presence of TAM. Further, the rate constant ( k s ) value was 0.021 ± 0.01 s –1 in the presence of TAM. In linear sweep voltammetry (LSV), an α value of about 0.636 ± 0.023 and an exchange rate constant ( k o ) value of about 0.097 ± 0.031 s –1 were obtained in the absence of TAM, which changed to 0.62 ± 0.081 and 0.089 ± 0.021 s –1 in the presence of TAM, respectively. Despite more published papers, when the TAM analyte was added to the NaOH supporting electrolyte, both anodic and cathodic peak currents of the modified NiO-CPE decreased. We suggested some reasons for this decreased peak current, and four mechanisms were illustrated for the electrode response in the presence of TAM.

show abstract

Nanoparticle modified electrodes: Surface coverage effects in voltammetry showing the transition from convergent to linear diffusion. The reduction of aqueous chromium (III) at silver nanoparticle modified electrodes

Cited by 27 publications

References 21 publications

Recent Advances in Voltammetry

Recent Advances in Voltammetry

Synergistic electrocatalytic effect of nanostructured mixed films formed by functionalised gold nanoparticles and bisphthalocyanines

Cyclic and Linear Sweep Voltammetric Studies of a Modified Carbon Paste Electrode with Nickel Oxide Nanoparticles toward Tamoxifen: Effects of Surface Modification on Electrode Response Kinetics

Contact Info

Product

Resources

About