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Mathematical modeling and experimental data of the oxidation of ascorbic acid on electrodes modified by nanoparticles.
- Source :
-
Journal of Solid State Electrochemistry . Aug2016, Vol. 20 Issue 8, p2323-2330. 8p. - Publication Year :
- 2016
-
Abstract
- Physical and mathematical models are proposed which describe the electrochemical transformation of compounds diffusing from the solution to an ensemble of nanoparticles (i.e., nanoelectrodes), located on a solid bulk electrode surface. Electrochemical oxidation of ascorbic acid at solid electrodes (glassy carbon, Graphite Ultra Trace and gold) unmodified and modified with gold nanoparticles (Au-ensemble of nanoelectrodes) was experimentally studied. Nanoeffects and diffusion limiting current were observed in the investigation of ascorbic acid oxidation on Au electrodes. Nanoeffects manifested themselves in a shift of the oxidation potential towards negative values with decreasing size of the nanoparticles. Agreement between theoretical and experimental results was demonstrated. The shift of the peak potential or half-peak potential can be used to estimate the size of nanoparticles and Gibbs free surface energy and contribution of nanoeffects to the kinetics of the electrode process. [ABSTRACT FROM AUTHOR]
- Subjects :
- *OXIDATION
*VITAMIN C
*NANOPARTICLES
*DATA
*SURFACE energy
Subjects
Details
- Language :
- English
- ISSN :
- 14328488
- Volume :
- 20
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 117357860
- Full Text :
- https://doi.org/10.1007/s10008-016-3249-9