scholarly journals Diagnostic Criteria for the Characterization of Electrode Reactions with Chemically Coupled Reactions Preceding the Electron Transfer by Cyclic Square Wave Voltammetry

ChemPhysChem ◽  
2016 ◽  
Vol 17 (16) ◽  
pp. 2596-2606 ◽  
Author(s):  
John C. Helfrick ◽  
Megan A. Mann ◽  
Lawrence A. Bottomley
Keyword(s):  
Electron Transfer ◽  
Diagnostic Criteria ◽  
Square Wave Voltammetry ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Coupled Reactions

Isopotential points in square-wave voltammetry of reversible electrode reactions

2009 ◽  
Vol 74 (10) ◽  
pp. 1489-1501 ◽  
Author(s):  
Marina Zelić ◽  
Milivoj Lovrić
Keyword(s):  
Square Wave Voltammetry ◽  
Electrode Reaction ◽  
Time Model ◽  
Model Calculations ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Electron Transfer Processes ◽  
Diagnostic Criterion ◽  
First Time

Isopotential points in square-wave voltammetry are described for the first time. Model calculations and real measurements (performed with UO22+ and Eu3+ in perchlorate and bromide solutions, respectively) indicate that such an intersection could be observed when backward components of the net response, resulting from an increase in frequency or reactant concentration, are presented together. The electrode reaction should be fully reversible because quasireversible or slower electron transfer processes give the isopoints only at increasing reactant concentrations but not at increasing square-wave frequencies. The effect could be used as an additional diagnostic criterion for recognition of reversible electrode reactions where products remain dissolved in the electrolyte solution.

scholarly journals Simulation-Based Approach to Determining Electron Transfer Rates Using Square-Wave Voltammetry

Langmuir ◽  
2017 ◽  
Vol 33 (18) ◽  
pp. 4407-4413 ◽  
Author(s):  
Philippe Dauphin-Ducharme ◽  
Netzahualcóyotl Arroyo-Currás ◽  
Martin Kurnik ◽  
Gabriel Ortega ◽  
Hui Li ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Square Wave Voltammetry ◽  
Transfer Rates ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Simulation Based

Single drop square wave polarography

1981 ◽  
Vol 59 (24) ◽  
pp. 3326-3333 ◽  
Author(s):  
Louis Ramaley ◽  
Wee Tee Tan
Keyword(s):  
Square Wave Voltammetry ◽  
Signal To Noise Ratio ◽  
Single Drop ◽  
Plane Model ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Average Current ◽  
The Times ◽  
Good Agreement

The theory of square wave voltammetry for reversible electrode reactions is expanded to include average currents and currents flowing to a growing drop (single drop square wave polarography) using an expanding plane model. Excellent agreement between theory and experiment was found for the reduction of Fe(III), good agreement for the reduction of Cd(II). The expanding plane model proved superior, but not greatly superior to the simpler theory. For the case of average current the effect on the polarogram of the times at which integration is started and stopped is discussed. Integration decreases sensitivity but increases signal-to-noise ratio. The conditions for maximum analytical usefulness are presented.

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.

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