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Three new Preparation and application of chemically modified electrodes

Author: ShenYu
Tutor: ZhengJianBin
School: Northwestern University
Course: Analytical Chemistry
Keywords: electrochemistry chemically modified electrode electrocatalysis SnHCF C60
CLC: O657.1
Type: Master's thesis
Year: 2009
Downloads: 132
Quote: 1
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Abstract


The application of new material for the preparation of selective and sensitive modified electrodes is one of the active areas. In this thesis, chemically modified electrodes using MHCF and C60-based materials were fabricated. This study may broaden the application range of MHCF and C60-based materials and enrich the content of electroanalytical chemistry. There are three chapters in this thesis. The main contributes of author are summarized as follows:A SnHCF modified carbon ceramic electrode （SnHCF/CCE） was prepared by electrodeposition. The electrochemical behaviors and electrocatalytic properties for SO32- oxidation were investigated by electrochemical methods. Studies showed that the modified electrode exhibited a pair of well-defined redox peak with the formal potential of +0.701 V, ascribing to the redox of SnHCF, was obtained. The SnHCF/CCE showed good electrocatalytical ability for SO32- oxidation and the relationship between peak current and SO32- concentration was linear in the range of 8.0×10-6 - 4.0×10-4 mol·L-1 （R = 0.9989）, The sensitivity and detection limit was 14.9μA·(mmol·L-1)-1 and 3×10-6 mol·L-1, respectively. Moreover, the SnHCF/CCE can be used for SO32- determination in vinegar and liqueur samples and a satisfictional results was obtained.A pyrocatechol violate/C60 modified glassy carbon electrode (PCV/C60/GCE) was prepared by adsorption method. The electrochemical behaviors and electrocatalytic properties of the modified electrode were investigated by electrochemical methods. Studies showed that the modified electrode exhibited a pair of well-defined redox peak with the formal potential of +0.28 V, ascribing to the redox process of quinine-hydroquinone functionalities in PCV. The PCV/C60/GCE showed good electrocatalytical ability for H2O2 reduction and the relationship between peak current and H2O2 concentration was linear in the range of 2.9×10 -6 - 2.6×10-4 mol·L-1 （R = 0.9994）, The sensitivity and detection limit was 1.3μA·(mmol·L-1)-1 and 2×10-6 mol·L-1, respectively.A C60-thionine modified Au electrode (C60-Th/Au) and a glucose oxidase/thionine-C60 modified Au electrode (GOD/C60-Th/Au) were prepared. The electrochemical behaviors and electrocatalytic properties of the modified electrode were investigated by electrochemical methods. Studies showed that the modified electrode exhibited a pair of well-defined redox peak with the formal potential of-0.19 V, ascribing to the redox process of Th/Th+ redox couples. The C60-Th/Au showed good electrocatalytical ability for H2O2 reduction and the relationship between peak current and H2O2 concentration was linear in the range of 5.8×10-6 - 3.9×10-4 mol·L-1 （R = 0.9999）, The sensitivity and detection limit was 2.8μA·(mol·L-1)-1 and 3×10-6mol·L-1, respectively.

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CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Electrochemical analysis
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