scholarly journals Ruthenium Oxide Hexacyanoferrate as an Effective Electrode Modifier for Amperometric Detection of Iodate and Hydrogen Peroxide

2020 ◽  
Vol 67 (4) ◽  
pp. 1216-1226
Author(s):  
Totka Dodevska ◽  
Ivan Shterev ◽  
Yanna Lazarova ◽  
Dobrin Hadzhiev
Keyword(s):  
Hydrogen Peroxide ◽  
Cyclic Voltammetry ◽  
Modified Electrode ◽  
Electrochemical Behaviour ◽  
Electrochemical Techniques ◽  
Ruthenium Oxide ◽  
Amperometric Detection ◽  
Modified Electrodes ◽  
Fast Response ◽  
High Catalytic Activity

Ruthenium oxide hexacyanoferrate (RuOHCF) film was electrochemically deposited onto a glassy carbon (GC) surface using consecutive cyclic voltammetry as a facile and green synthetic strategy. The electrochemical behaviour and electrocatalytic properties of the modified electrode RuОHCF/GC were evaluated with regards to electroreduction of hydrogen peroxide and iodate in a strong acidic medium (pHs 1.0–2.0) by using different electrochemical techniques, including cyclic voltammetry and amperometry at a constant potential. Electrochemical studies indicated that RuОHCF/GC possess a high catalytic activity in both studied reactions, fast response and good reproducibility of the current signal. The RuОHCF/GC exhibits enhanced electrocatalytic behaviour compared with other modified electrodes reported before. The simple and reproducible procedure for electrode fabrication, the wide linear range, anti-interference performance and long-time stability of the RuОHCF/GC make it a promising sensing material for practical quantitative determination of hydrogen peroxide and iodate. Remarkably, the reported modified electrode provided superior sensitive (1050 μA mM–1 cm–2) and highly selective amperometric detection of iodate.

Application of a Novel Modified Electrode Based on NaY-Encapsulated Co(PAN) Complex

2008 ◽  
Vol 587-588 ◽  
pp. 109-113
Author(s):  
C. Teixeira ◽  
P. Parpot ◽  
Isabel Neves ◽  
António Maurício C. Fonseca
Keyword(s):  
Cyclic Voltammetry ◽  
Chemical Analysis ◽  
Aqueous Medium ◽  
Surface Analysis ◽  
Modified Electrode ◽  
Modified Electrodes ◽  
Redox Properties ◽  
New Method ◽  
Y Zeolite

CoPAN complex has been entrapped in the supercages of Y zeolite and the redox properties of this zeolite-encapsulated complex were investigated by cyclic voltammetry with a new method for the preparation of carbon toray-zeolite-modified electrode. Formation of the CoPAN complex was ascertained by surface analysis (SEM, XRD), chemical analysis (CA), spectroscopy methods (FTIR and UV/vis) and cyclic voltammetry in aqueous medium with zeolite-modified electrodes. The cyclic voltammetry studies obtained with a zeolite-modified electrode shows evidence for electroactivity restricted to boundary associated CoPAN complex.

Bacteriophage-Based Biosensor for Detection of E. coli Bacteria on Graphene Modified Carbon Paste Electrode

2019 ◽  
Vol 9 (3) ◽  
pp. 408-413 ◽  
Author(s):  
Amir H. Keihan ◽  
Ghader Hosseinzadeh ◽  
Sharareh Sajjadi ◽  
Danial Ashiani ◽  
Fariba Dashtestani ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Techniques ◽  
Modified Electrodes ◽  
Fast Response ◽  
Modified Carbon Paste Electrode ◽  
Label Free ◽  
Human Pathogens ◽  
Carbon Paste ◽  
E Coli ◽  
Paste Electrode

Background: Escherichia coli (E. coli) bacteria is one of the hazardous human pathogens. Consequently, developing the rapid and effective method for identification and quantization of E. coli is popular in biotechnological researches in recent years. Experimental: In this research, a label-free capacitance E. coli biosensor was fabricated based on immobilizing bacteriophage on the carbon paste electrode (Cp). Reduced graphene (RGr) was synthesized and used as a substrate for immobilization of bacteriophage on the Cp surface. E. coli bacteriophage was trapped in graphene modified carbon paste electrodes. The immobilization accuracy was confirmed via electrochemical techniques. The modified electrodes were applied as indicator electrodes for capacitance measurements of E. coli. Results: Through this method, E. coli was detected in a concentration range of 33×10-3 to 330×10-3 N L-1 (number of E. coli per Liter) with a correlation coefficient of 0.99 and a detection limit of 12×10-3 N L-1. Conclusion: The proposed biosensor has a fast response time of about 5 s and good selectivity over other bacteria.

Electrooxidation for Methanol on Pd Nanoparticles Modified Electrodes in Alkaline Medium

2012 ◽  
Vol 535-537 ◽  
pp. 431-435
Author(s):  
Ming Li Xu ◽  
Guo Tao Yang
Keyword(s):  
Cyclic Voltammetry ◽  
Catalytic Oxidation ◽  
Modified Electrode ◽  
Palladium Nanoparticles ◽  
Modified Electrodes ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Electrochemical Process ◽  
Glassy Carbon Electrodes ◽  
Cyclic Voltammetry Method

In this paper, Palladium nanoparticles were electrodeposited on the surface of glassy carbon electrodes by more circles cyclic voltammetry method and Palladium nanoparticles modified electrode (Pd/GCE) was obtained. Morphology and crystal structure of nanoparticles were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The performance and electrochemical process of catalytic oxidation methanol were measured and analyzed by cyclic voltammetry (CV), chronoamperometric curves (i-t) and alternating current impedance spectra (AC impedance) in KOH solution. The results showed that catalytic activity of Pd nanoparticles modified electrode for methanol was over 30 times higher than that of the plate Pd electrode, and catalytic performance was good. In addition, the catalytic oxidation was mainly diffusion-controlled process.

Flow Injection Amperometric Detection of 2‘-Deoxyguanosine at a Ruthenium Oxide Hexacyanoferrate Modified Electrode

2007 ◽  
Vol 79 (14) ◽  
pp. 5392-5398 ◽  
Author(s):  
Thiago R. L. C. Paixão ◽  
Camila C. M. Garcia ◽  
Marisa H. G. Medeiros ◽  
Mauro Bertotti
Keyword(s):  
Modified Electrode ◽  
Flow Injection ◽  
Ruthenium Oxide ◽  
Amperometric Detection

scholarly journals Electrocatalytic Oxidation of Hydrogen Peroxide Based on the Shuttlelike Nano-CuO-Modified Electrode

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Geng Yang ◽  
Fu Chen ◽  
Zhousheng Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Detection Limit ◽  
Modified Electrode ◽  
Synthesis Method ◽  
Fast Response ◽  
Glass Carbon Electrode ◽  
Optimal Experiment ◽  
Glass Carbon ◽  
Cuo Nanocrystals ◽  
Response Current

CuO nanocrystals were prepared with hydrothermal synthesis method. The morphology of the nano-CuO was characterized by scanning electron microscopy. The prepared shuttlelike CuO nanocrystals were modified to glass carbon electrode (GCE) to form nano-CuO/GCE modified electrode. The obtained modified electrode showed an excellent electrocatalytic property towards hydrogen peroxide in 0.01 M NaOH containing 0.09 M KCl electrolyte. Under the optimal experiment conditions, the electrocatalytic response current of this sensor was proportional to the H2O2concentration in the range of 0.02 μM~250 μM with a detection limit down to 7 nM (signal/noise = 3). The sensitivity was calculated to be 227 μA/mM. The H2O2sensor exhibited low detection limit, fast response time, and good reproducibility and could be applied to determine hydrogen peroxide.

scholarly journals Amperometric sensing of hydrogen peroxide using glassy carbon electrode modified with rhodium

2018 ◽  
Vol 1 (1) ◽  
pp. 63
Author(s):  
Totka Mihaylova Dodevska ◽  
Yanna Lubomirova Lazarova
Keyword(s):  
Hydrogen Peroxide ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Dynamic Range ◽  
Electrochemical Behaviour ◽  
Operational Parameters ◽  
Electrochemically Deposited ◽  
Constant Potential ◽  
Amperometric Sensing

Following our previous studies on the catalytic activity of electrochemically deposited on glassy carbon Rh electrocatalyst towards the reduction of hydrogen peroxide (H2O2), the electrochemical behaviour of the modified electrode was studied by means of cyclic voltammetry and chronoamperometry at pH-values from 5.0 to 9.0. The modified electrode exhibited a rapid, sensitive and reproducible response for the quantitative determination of H2O2 at low applied potential. Amperometry carried out at constant potential of 0 V (vs. Ag/AgCl, 3M KCl) at pH 6.0 (25 oC) gave the following operational parameters: detection limit of 4 μM, linear dynamic range  0.01 – 5.5 mM and electrode sensitivity of 377 μA mM−1 cm−2 .

The Preparation, Characterization and Application of the CNTs Modified Electrode

2011 ◽  
Vol 694 ◽  
pp. 838-841
Author(s):  
Xue Mei Cui ◽  
Gui Fu Ding ◽  
Yan Wang ◽  
Wen Jing Lu ◽  
Hui Shen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Composite Film ◽  
Field Emission ◽  
Modified Electrode ◽  
Modified Electrodes ◽  
Preparation Technology ◽  
Chemical Etch ◽  
Scanning Electron

We propose a novel preparation technology of CNTs modified electrode. CNTs are mixed with polymer into homogenate by mechanical ball grinder; spin homogenate into composite film; solidify and polish composite film; chemical etch polymer partly from the surface of the composite film, in order to keep part of the CNTs be inserted in polyimide and the remainder outside of film, then CNTs modified electrode can be got. The morphologies of CNTs modified electrode are observed by field emission scanning electron microscopy (FESEM). The application of CNTs modified electrode in alum solution battery is demonstrated. Cyclic voltammetry of CNTs modified electrodes in V4+ solution is discussed.

Sign in / Sign up

Export Citation Format

Share Document