scholarly journals Electrocatalysis of a SiC particle-modified glassy carbon electrode for the oxidation of adrenaline in a KRPB physiological solution

2005 ◽  
Vol 70 (5) ◽  
pp. 745-752 ◽  
Author(s):  
Zhang-Yu Yu ◽  
De-Sheng Kong ◽  
Shu-Xin Wu ◽  
Lei Wang ◽  
Hanf-Qing Wang
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Electrochemical Reaction ◽  
Physiological Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Adsorption Effect ◽  
Electrocatalytic Effect ◽  
Sic Particle

The electrocatalytic properties of a SiC particle-modified glassy carbon electrode (MGC) for adrenaline oxidation were studied by cyclic voltammetry, double-potential step chronoculometry and electrochemical impedance spectroscopy in a pH 7.4 physiological Kres?Ringer phosphate buffer (KRPB) solution. It was shown that modification of the electrode with SiC particles has a marked electrocatalytic effect on the electrochemical reaction of adrenaline, i.e., the activity and the reversibility of the MGC electrode were significantly improved compared to an unmodified electrode. This was attributed to the adsorption effect of the electroactive adrenaline molecules on the MGC electrode surface. .

Preparation and characterization of a poly-o-phenylenediamine film modified glassy carbon electrode as a H2O2 sensor

2013 ◽  
Vol 91 (11) ◽  
pp. 1077-1084 ◽  
Author(s):  
Wenying Zhai ◽  
Xiuying Tian ◽  
Yun Yan ◽  
Yuehua Xu ◽  
Yuechun Zhao ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Monomer Concentration ◽  
Acetate Buffer ◽  
Acetate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

A poly-o-phenylenediamine film modified glassy carbon electrode (PoPD/GC) was successfully prepared by cyclic voltammetry in acetate buffer solution. The polymerization mechanism of oPD is discussed. The impedance behavior and morphology of the PoPD membrane were characterized using cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, respectively. It is discovered that the PoPD/GC prepared only in acetate buffer solution had dual electrocatalytic activity toward the oxidation and reduction of H2O2. The optimal buffer solution pH, scanning rate, monomer concentration, and number of scannings for film forming were 4.2, 0.05 V s−1, 6.0 mmol L−1, and 30, respectively. The linear ranges between the anodic (Δia) or cathodic (Δic) current and H2O2 concentration were 0.07−1.0 × 104 and 0.04−4.5 × 104 μmol L−1, respectively. The corresponding calibration curves were Δia (μA) = 8.03c (mmol L−1) + 6.36 (n = 18, R2 = 0.9989) and Δic (μA) = −5.52c (mmol L−1) − 0.77 (n = 18, R2 = 0.9990) with a detection limit of 0.03 and 0.02 μmol L−1 (S/N = 3), respectively. The PoPD/GC prepared in the optimal conditions showed good stability and quick response (<0.2 s) to H2O2, which was successfully applied to the determination of H2O2 in real water samples with satisfactory results.

Comparative Studies of Electrochemical Behaviors of Benzenediols at a Gold Nanoparticle/carbon Nanotube Composite Modified Glassy Carbon Electrode

2011 ◽  
Vol 14 (3) ◽  
pp. 183-189
Author(s):  
Yong-Ping Dong ◽  
Qian-Feng Zhang ◽  
Taike Duan
Keyword(s):  
Carbon Nanotube ◽  
Gold Nanoparticle ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrochemical Characteristics ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Electrocatalytic Effect ◽  
Carbon Nanotube Composite

A gold nanoparticle/carbon nanotube composite modified glassy carbon electrode was fabricated and used to investigate electrochemical characteristics of hydroquinone, catechol, and resorcinol via cyclic voltammetric analysis under neutral pH conditions. The results imply that the gold nanoparticle/carbon nanotbue modified electrode exhibited a synergistic and excellent electrocatalytic effect of gold nanoparticles and carbon nanotube on the redox behaviors of benzenediols. The reversibility of electrochemical reaction was improved greatly and the peak currents were increased significantly compared with a bare electrode. Good linear relationships were obtained between the oxidation peak currents and the concentrations of catechol and resorcinol. The electrochemical process of catechol was controlled by surface adsorption process, while that of resorcinol was controlled by diffusion process. However, the peak current and the concentration of hydroquinone were not proportional in the whole concentration range, which is because the controlling process of electrochemical reactions was different in the different hydroquinone concentration. Benzenediols could be detected simultaneously at the modified electrode but not at the bare electrode. The stability of the modified electrode was excellent in the benzenediols solutions, which made it possible for the practical application of the modified electrode.

scholarly journals Poly(glutamic acid) nanofibre modified glassy carbon electrode: Characterization by atomic force microscopy, voltammetry and electrochemical impedance

2008 ◽  
Vol 53 (11) ◽  
pp. 3991-4000 ◽  
Author(s):  
Daniela Pereira Santos ◽  
Maria Valnice Boldrin Zanoni ◽  
Márcio Fernando Bergamini ◽  
Ana-Maria Chiorcea-Paquim ◽  
Victor Constantin Diculescu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Glutamic Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Electrode Characterization
Sign in / Sign up

Export Citation Format

Share Document