scholarly journals A cyclic voltammetry and PM6 semi-empirical molecular orbital method study of the capacity behaviour of an aluminum-8-hydroxyquinoline complex modified carbon paste electrode

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3586-3593 ◽  
Author(s):  
Y. Zhu ◽  
A. Bao ◽  
B. Na ◽  
G. Su ◽  
J. Wang ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Capacitor ◽  
Graphite Powder ◽  
Modified Carbon Paste Electrode ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Carbon Paste ◽  
Powder Surface ◽  
Semi Empirical ◽  
Paste Electrode

A graphite powder surface was modified by aluminum-8-hydroxyquinoline complex, and functionalised as an electron storage and transfer surface for use as one of the electrodes in an electrochemical capacitor.

scholarly journals Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

Chemosensors ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 24 ◽  
Author(s):  
Bananakere Nanjegowda Chandrashekar ◽  
Weizhong Lv ◽  
Gururaj Kudur Jayaprakash ◽  
Karim Harrath ◽  
Louis W.Y. Liu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Uric Acid ◽  
Carbon Paste Electrode ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Oxidation Potentials ◽  
Chemical Studies ◽  
Quantum Chemical Studies ◽  
Paste Electrode

Fabrication of biocompatible electrodes for the investigation of catecholamines is a known challenge. In this work, methionine was chosen as a modifier for fabrication of a biocompatible carbon paste electrode by electropolymerization, through cyclic voltammetry. The electrochemical behavior of the poly(methionine) modified carbon paste electrode was characterized by cyclic voltammetry for simultaneous determination of dopamine (DA) and uric acid (UA) in a phosphate-buffered solution at pH 7.0. In the absence of an amino acid methionine layer, the bare carbon paste electrode exhibits rather poor voltammetric signals in DA and UA in the binary mixture, with oxidation potentials of DA and UA overlapping with each other. The poly(methionine) modified carbon paste electrode exhibits good catalytic activity with noticeably different oxidation potentials of DA and UA. The experimental results closely agree with the theoretical prediction based on a Fukui function complementary to the simulated electrostatic potential maps.

Formation of Palladium Complex at Carbon Paste Surface in Chloride Solution as Studied by Cyclic Voltammetry

2001 ◽  
Vol 66 (10) ◽  
pp. 1457-1472 ◽  
Author(s):  
Karl-Heinz Lubert ◽  
Markus Guttmann ◽  
Lothar Beyer
Keyword(s):  
Cyclic Voltammetry ◽  
Palladium Complex ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Cathodic Peak ◽  
Potential Sweep ◽  
Positive Direction ◽  
Paste Electrode ◽  
Preceding Application ◽  
Reaction Schemes

The deposition and dissolution of palladium at non-modified carbon paste electrode (CPE) is studied by cyclic voltammetry in chloride solutions (c ≥ 0.5 M KCl and pH 3 to 6). The Pd0 is deposited from tetrachloropalladate solution by potential cycles from E ≥ 0 V (vs Ag/AgCl) or positive potentials up to -0.5 V or by potentiostatic treatment at E ≤ 0 V. Oxidation peaks appear during potential sweep to positive direction after the preceding deposition of Pd. The appearance of two anodic peaks depends mainly on the amount of Pd0 deposited. The peak at about +0.1 V is caused by the dissolution of a palladium mono- or submonolayer, whereas the oxidation peak at more positive potentials is attributed to the dissolution of Pd from a palladium multilayer. After palladium deposition and potential sweep to positive potentials E > +0.8 V (or potentiostatic treatment at E > +0.8 V), a cathodic peak appears at about 0 V and corresponding anodic peak at +0.1 V. It is concluded that these peaks are caused by reduction and oxidation of the chloropalladate surface complex formed during preceding application of anodic potentials. Reaction schemes of PdII/Pd0 and chloropalladate complex are discussed.

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