Cyclic voltammetry on electrode surfaces covered with porous layers: An analysis of electron transfer kinetics at single-walled carbon nanotube modified electrodes

Streeter, Ian; Wildgoose, Gregory G.; Shao, Lei; Compton, Richard G.

doi:10.1016/j.snb.2008.03.015

Cited by 430 publications

(296 citation statements)

References 31 publications

Supporting

Mentioning

260

Contrasting

Unclassified

Order By: Relevance

“…For example, it was found that the usual semi-infinite planar diffusion model is not accurate enough to fully explain cyclic voltammetry because thin layer effects likely operate even in simple cases such as the oxidation of ferrocyanide on glassy carbon electrodes modified with SWCNT [42]. However, we will see that thin layer effects explain peak shifts occurring on hydrogen peroxide while do not support peaks shift on etoposide and ferrocyanide on MWCNT.…”

Section: Introductionmentioning

confidence: 68%

“…As seen before, there is a diffusion layer in the region around carbon nanotubes that does not necessarily support phenomena following the semi-infinite planar diffusion model [42]. Even more complex are the cases when the enzyme directly exchanges electrons with the CNT (as in the case of cytochromes P450).…”

Section: Cottrell Effectmentioning

confidence: 94%

“…In this case, the phenomenon is more accurately explained by thin-layer effects, which can have a profound impact on the observed peaks potential and separation. In fact, the following equation was proposed for a fully irreversible electron transfer system [42]:…”

Section: Nernst Effectmentioning

confidence: 99%

“…As explained [42], less time is required to deplete the layer of electro-active species because we are now facing only a layer of thickness l and, therefore, the peak shifts to less oxidative potentials. Table 3 Largely evident Nernst effect on H2O2.…”

Section: Nernst Effectmentioning

confidence: 99%

See 3 more Smart Citations

Do Carbon Nanotubes contribute to Electrochemical Biosensing?

Carrara

Baj-Rossi

Boero

et al. 2014

Electrochimica Acta

View full text Add to dashboard Cite

a b s t r a c tCarbon nanotubes have been attracting a lot of interest as electron transfer mediators to enhance electrochemical biosensing. The main reason behind this is usually recognized in terms of augmented electrochemical active surface area. The aim of this paper is to review other phenomena that occur at the electrochemical interface. Three distinct features of these phenomena mainly appear in electrochemical biosensing. We introduce the Cottrell, Randle-Sevčick, and Nernst effects to address these features. By using these features, several electrochemical biosensing systems are investigated. Differences among the proposed systems are presented and analyzed in light of these effects. We finally have demonstrated that carbon nanotubes may induce completely opposite effects when dealing with different biosensing systems. This paper also shows that even seemingly small differences (e.g., changing metabolite as detected by the same enzyme) might result in opposite effects on the same carbon nanotube based sensor. Nevertheless, it is shown that carbon nanotubes, in some cases, confirm their exceptional nature in enhancing the sensor performance by orders of magnitude. The sensitivity increases from 87 ± 62 to 3718 ± 73 nA/M ×cm 2 and detection limit decreases from 7.5 ± 5.3 mM to 84 ± 2 M in case of cyclophosphamide detected by the cytochromes P450 3A4.

show abstract

Section: Introductionmentioning

confidence: 68%

Section: Cottrell Effectmentioning

confidence: 94%

Section: Nernst Effectmentioning

confidence: 99%

Section: Nernst Effectmentioning

confidence: 99%

See 2 more Smart Citations

Do Carbon Nanotubes contribute to Electrochemical Biosensing?

Carrara

Baj-Rossi

Boero

et al. 2014

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…Electrochemical analysis was carried out under the optimized conditions using cyclic voltammetry (CV) and square wave voltammetry (SWV) in BR buffer; pH 6.5. MCZ/GCE showed a remarkable enhancement in the current response of oxidation process of 5-HT in comparison to the bare GCE which was described on the basis of the interlayer mass transport regime within the porous layer of MCZ [22][23][24][25]. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were employed for the structural and morphological analysis of the nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

MWCNT-Chitosan-ZrO2 Nanocomposite Modified Sensor for Sensitive and Selective Electrochemical Determination of Serotonin

Devnani¹

2015

IJIRSET

View full text Add to dashboard Cite

ABSTRACT:A novel sensitive electrochemical sensor has been developed by modification of glassy carbon electrode (GCE) with multi-walled carbon nanotube (MWCNT), chitosan (CHIT) and zirconium oxide (ZrO 2 ) nanoparticles. The morphological characteristics of nanocomposite (MWCNT-CHIT-ZrO 2 or MCZ) were studied by scanning electron microscope and atomic force microscopy. The electrochemical behavior of serotonin at nanocomposite modified GCE (MCZ/GCE) was investigated in pH 6.5 Briton Robinson buffer solution using cyclic voltammetry and square wave voltammetry. MCZ/GCE showed an enhancement in the current response as compared to bare GCE and showed a linear response to serotonin in the range 800 to 5000 nM. The limit of detection was found to be 0.6 nM, which is lower than many other sensors reported for serotonin in literature. The modified sensor showed high sensitivity (9 nA/nM) and selectivity for serotonin. The proposed method was successfully employed for quantification of serotonin in human blood serum samples.

show abstract

Metal and Metal Oxide Electrocatalysts for Redox Flow Batteries

Amini

Gostick

Pritzker

2020

Adv Funct Materials

View full text Add to dashboard Cite

Redox flow batteries (RFBs) are one of the promising technologies for large‐scale energy storage applications. For practical implementation of RFBs, it is of great interest to improve their efficiency and reduce their cost. One of the key components of RFBs that can greatly influence the efficiency and final cost is the electrode. The chemical and structural nature of electrodes can modify the kinetics of redox reactions and the accessibility of the electroactive species to available active sites. The ideal electrocatalyst for RFBs must have good activity for the desirable redox reaction, provide a high surface area, and exhibit sufficient conductivity and durability over repeated use. One strategy is to coat the electrode with metal and metal oxide electrocatalysts. Metal electrocatalysts have the advantage of high conductivity, while metal oxide catalysts are usually less expensive and so more economically attractive. In order to gain a better understanding of the performance of the electrocatalysts in RFBs, a comprehensive review of the progress in the development of metal and metal oxide electrocatalysts for RFBs is provided and a critical comparison of the latest developments is presented. Finally, practical recommendations for advancement of electrocatalysts and effective transfer of knowledge in this field are provided.

show abstract

Cyclic voltammetry on electrode surfaces covered with porous layers: An analysis of electron transfer kinetics at single-walled carbon nanotube modified electrodes

Cited by 430 publications

References 31 publications

Do Carbon Nanotubes contribute to Electrochemical Biosensing?

Do Carbon Nanotubes contribute to Electrochemical Biosensing?

MWCNT-Chitosan-ZrO2 Nanocomposite Modified Sensor for Sensitive and Selective Electrochemical Determination of Serotonin

Metal and Metal Oxide Electrocatalysts for Redox Flow Batteries

Contact Info

Product

Resources

About