scholarly journals A mechanistic study of the EC′ mechanism – the split wave in cyclic voltammetry and square wave voltammetry

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70237-70242 ◽  
Author(s):  
Peng Song ◽  
Adrian C. Fisher ◽  
Jay D. Wadhawan ◽  
Joshua J. Cooper ◽  
Haydn J. Ward ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Square Wave Voltammetry ◽  
Mechanistic Study ◽  
Electrochemical Reactions ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Ec Mechanism

In this paper, a detailed investigation of electrochemical reactions coupled with homogenous chemical steps using cyclic voltammetry (CV) and square wave voltammetry (SWV) was carried out to study the electrocatalytic (EC′) mechanism.

New PGE Modified Electrode Comprising Ni NPs/1,5-Diphenylcarbazide Film Capable for Analyzing Oxytocin

2020 ◽  
Vol 18 (11) ◽  
pp. 793-800
Author(s):  
Mahsa JaFari-Pouyani ◽  
Samineh Kaki ◽  
Arash Babakhanian
Keyword(s):  
Cyclic Voltammetry ◽  
Linear Response ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Nano Particles ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Microscopy Techniques ◽  
Bare Surface ◽  
Human Blood Serum Sample

This study focuses on the compatibility of square wave voltammetry technique with new modified graphite pencil electrode to quantify Oxytocin. Ni-Nano particles and 1,5-diphenylcarbazide modifiers were quickly electro-deposited by cyclic voltammetry sweeping technique on the bare surface of a graphite pencil electrode. The electrochemical and morphological assessments were accomplished with cyclic voltammetry, square wave voltammetry and scanning electron microscopy techniques. The proposed electrochemical sensor revealed a good electro catalytic response to Oxytocin concerning the parameters α = 0.42, log Ks =3.44 and Γ = 8.72×10−10 in the optimized pH of 4 and the working potential of about 0.35 V. The new sensor also exhibited a linear response to Oxytocin over the concentration range of 125 to 350 nmolL−1 with the limit of detection of 41.53 nmolL−1. Moreover, the applicability of the proposed sensor was successfully examined and it became usable to determine Oxytocin accurately and precisely in real samples such as human blood serum sample without any serious side interference.

1,2-Dicyanoferrocene: synthesis and characterization

2016 ◽  
Vol 94 (6) ◽  
pp. 547-551 ◽  
Author(s):  
Mohammad A. Abdulmalic ◽  
Steve W. Lehrich ◽  
Heinrich Lang ◽  
Tobias Rüffer
Keyword(s):  
Cyclic Voltammetry ◽  
Solid State ◽  
Single Crystal ◽  
Square Wave Voltammetry ◽  
Molecular Structures ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Convenient Synthesis

A convenient synthesis of 1,2-dicyanoferrocene (3) was developed by using 2,4-dinitrofluorobenzene as a dehydrating agent for the treatment of 1,2-ferrocenedicarbaldehyde dioxime (2) to give 3 in yields exceeding 80%. Compounds 2 and 3 have been characterized by IR and NMR (1H, 13C{1H}) spectroscopy and by electrochemistry (cyclic voltammetry and square-wave voltammetry). Furthermore, the molecular structures of 2 and 3 in the solid state have been determined by single-crystal X-ray crystallographic studies.

Synthesis and characterization of novel conducting homopolymers based on amino β-styryl terthiophene

2008 ◽  
Vol 86 (11) ◽  
pp. 1010-1018 ◽  
Author(s):  
Hakim Mehenni ◽  
Lê H Dao
Keyword(s):  
Cyclic Voltammetry ◽  
Photoelectron Spectroscopy ◽  
Square Wave Voltammetry ◽  
Covalent Bonding ◽  
Modified Glassy Carbon Electrode ◽  
X Ray ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Amine Groups

Novel ECPs (electronic conducting polymers) based on amino β-styryl-substituted terthiophene (AST) were synthetized by direct electropolymerization. The ECPs were characterized by cyclic voltammetry, square-wave voltammetry, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The poly(amino β-styryl terthiophene) displayed cyclic and square-wave voltammograms with redox peaks that can be assigned to the aminophenyl moiety and the polyterthiophene backbone. The presence of free primary amine groups on the ECP film permitted further biological functionalization (i.e., covalent bonding of various bioreceptors on its surface). The electrochemical performance of Biotin grafted at the AST modified glassy carbon electrode was investigated to detect the Avidin protein in solution by cyclic voltammetry and square-wave voltammetry.Key words: electronic conducting polymer, electrode surface modification, biosensor, β-styryl-substitued terthiophene, functionalization, cyclic, square-wave voltammetry.

Riboflavin detection by α-Fe2O3/MWCNT/AuNPs-based composite and a study of the interaction of riboflavin with DNA

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17888-17896 ◽  
Author(s):  
C. Sumathi ◽  
P. Muthukumaran ◽  
S. Radhakrishnan ◽  
G. Ravi ◽  
J. Wilson
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Square Wave Voltammetry ◽  
Carbon Electrode ◽  
Square Wave ◽  
Wave Voltammetry

The electrochemical behavior of riboflavin (RF) at a glassy carbon electrode modified with α-Fe2O3/MWCNT/AuNPs was investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV).

scholarly journals Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

2018 ◽  
Vol 8 (4) ◽  
pp. 281-289
Author(s):  
Izabel Cristina Eleotério ◽  
Marco Aantonio Balbino ◽  
José Fernando De Andrade ◽  
Bruno Ferreira ◽  
Adelir Aparecida Saczk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Veterinary Medicine ◽  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode ◽  
Detection And Quantification

In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec­trochemical behavior of SMX was investigated by cyclic voltammetry (CV), and the quantitative analysis of SMX was provided by SWV. The analytical curve was obtained with a linear correlation coefficient (r) of 0.985 and standard deviation (SD) of 0.005 μA. Limits of detection and quantification were found as 2.3×10-6 and 7.7×10-6 mol L-1, respectively. According to the obtained results, the new carbon paste prototype electrode can successfully be employed in this kind of electroanalytical applications.

Synthesis, electrochemical and spectroelectrochemical studies of octaphenylthio-substituted phthalocyanines

2005 ◽  
Vol 09 (07) ◽  
pp. 484-490 ◽  
Author(s):  
Fungisai Matemadombo ◽  
M. David Maree ◽  
Kenneth I. Ozoemena ◽  
Philippe Westbroek ◽  
Tebello Nyokong
Keyword(s):  
Cyclic Voltammetry ◽  
Square Wave Voltammetry ◽  
Redox Processes ◽  
Tetrabutylammonium Perchlorate ◽  
Square Wave ◽  
Wave Voltammetry

Cobalt (4) and iron (5) phenylthio-substituted phthalocyanines ( MPc ( SR )8) have been synthesized and characterized. Cyclic square wave voltammetry in dimethylformamide containing tetrabutylammonium perchlorate revealed five and six redox processes, respectively, for complexes 4 and 5. The complexes are easier to reduce compared to the corresponding unsubstituted MPc and to butylthio substituted derivatives. The first oxidation and reduction occurs on the metal for both complexes. Spectroelectrochemistry (in dimethylformamide containing tetrabutylammonium perchlorate) was employed to assign the cyclic voltammetry peaks, and gave spectra characteristic of Fe I Pc for reduction of 5 and Co I Pc for the reduction of 4. The spectrum of the former is particularly of importance since such species have not received much attention in the literature.

scholarly journals Cyclic and square-wave voltammetry for selective simultaneous NO and O<sub>2</sub> gas detection by means of solid electrolyte sensors

2020 ◽  
Vol 9 (2) ◽  
pp. 355-362
Author(s):  
Anastasiya Ruchets ◽  
Nils Donker ◽  
Jens Zosel ◽  
Daniela Schönauer-Kamin ◽  
Ralf Moos ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Solid Electrolyte ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Inert Gases ◽  
Cyclic Voltammograms ◽  
Square Wave ◽  
Temperature Range ◽  
Wave Voltammetry ◽  
Scan Rate

Abstract. Solid electrolyte gas sensors (SESs) based on yttria-stabilized zirconia (YSZ) are suitable to detect traces of redox components in inert gases. Usually, their signals are generated as a voltage between two electrodes at open circuit potential or as a current flowing between constantly polarized electrodes. In these rather stationary modes of operation, SESs often lack the desired selectivity. This drawback can be circumvented if SESs are operated in dynamic electrochemical modes that utilize the differences of electrode kinetics for single components to distinguish between them. Accordingly, this contribution is directed to the investigation of cyclic voltammetry and square-wave voltammetry as methods to improve the selectivity of SESs. For this, a commercial SES of the type “sample gas, Pt|YSZ|Pt, air” was exposed to mixtures containing NO and O2 in N2 in the temperature range between 550 and 750 ∘C. On cyclic voltammograms (CVs), NO-related peaks occur in the cathodic direction at polarization voltages between −0.3 and −0.6 V at scan rates between 100 and 2000 mV s−1 and temperatures between 550 and 750 ∘C. Their heights depend on the NO concentration, on the temperature and on the scan rate, providing a lower limit of detection below 10 ppmv, with the highest sensitivity at 700 ∘C. The O2-related peaks, appearing also in the cathodic direction between −0.1 and −0.3 V at scan rates between 100 and 5000 mV s−1, are well separated from the NO-related peaks if the scan rate does not exceed 2000 mV s−1. Square-wave voltammograms (SWVs) obtained at a pulse frequency of 5 Hz, pulses of 0.1 mV and steps of 5 mV in the polarization range from 0 to −0.6 V also exhibit NO-related peaks at polarization voltages between −0.3 and −0.45 V compared to the Pt–air (platinum–air) electrode. In the temperature range between 650 and 750 ∘C the highest NO sensitivity was found at 700 ∘C. O2-related peaks arise in the cathodic direction between −0.12 and −0.16 V, increase with temperature and do not depend on the concentration of NO. Since capacitive currents are suppressed with square-wave voltammetry, this method provides improved selectivity. In contrast to cyclic voltammetry, a third peak was found with square-wave voltammetry at −0.48 V and a temperature of 750 ∘C. This peak does not depend on the NO concentration. It is assumed that this peak is due to the depletion of an oxide layer on the electrode surface. The results prove the selective detection of NO and O2 with SESs operated with both cyclic voltammetry and square-wave voltammetry.

scholarly journals Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

2018 ◽  
Author(s):  
Izabel Cristina Eleotério ◽  
Marco Aantonio Balbino ◽  
José Fernando De Andrade ◽  
Bruno Ferreira ◽  
Adelir Aparecida Saczk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Veterinary Medicine ◽  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode ◽  
Detection And Quantification

<p class="PaperAbstract"><span lang="EN-US">In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec­trochemical behavior of SMX was investigated by cyclic voltammetry (CV), and the quantitative analysis of SMX was provided by SWV. The analytical curve was obtained with a linear correlation coefficient (r) of 0.985 and standard deviation (SD) of 0.005 μA. Limits of detection and quantification were found as 2.3</span><a name="_Hlk512068463"></a><span lang="EN-US">×</span><span lang="EN-US">10<sup>-6</sup> and 7.7</span><span lang="EN-US">×</span><span lang="EN-US">10<sup>-6</sup> mol L<sup>-1</sup>, respectively. According to the obtained results, the new carbon paste prototype electrode can successfully be employed in this kind of electroanalytical applications.</span></p>

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