| Full text | |
| Author(s): |
Barragan, Jose T. C.
[1]
;
Kogikoski, Jr., Sergio
[1]
;
da Silva, Everson T. S. G.
[1]
;
Kubota, Lauro T.
[1]
Total Authors: 4
|
| Affiliation: | [1] State Univ Campinas UNICAMP, Inst Chem, Dept Analyt Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Analytical Chemistry; v. 90, n. 5, p. 3357-3365, MAR 6 2018. |
| Web of Science Citations: | 14 |
| Abstract | |
In this work, a new hypothesis for the electrocatalytic behavior of CuO electrodes is presented. Different from the established mechanism, here we discuss why Cu-III species do not participate in the oxidation mechanism of carbohydrates. We show that hydroxyl ion adsorption and the semiconductive properties of the material play a more significant role in this process. The relationship between the flat band potential and the potential that begin oxidation suggests that the concentration of vacancies in the charge region acts upon the reactivity of the adsorbed hydroxyl ions through a partial charge transfer reaction. In the presence of carbohydrate molecules, the electron transfer is facilitated and involves the transfer of electrons from the adsorbed hydroxyl ions to the CuO film. This mechanism is fundamentally relevant since it helps the understanding of several experimental misleads. The results can also lead to obtaining better catalysts, since improvements in the material should focus on enhancing the semiconductive properties rather than the Cu-II/Cu-III redox transition. The results shed light on different aspects of carbohydrate molecules oxidation that could lead to novel applications and possibly a better description of other semiconductor mechanisms in electrocatalysis. (AU) | |
| FAPESP's process: | 16/14507-8 - Structural and Electrochemical Studies of Nanostructures films based on DNA |
| Grantee: | Sergio Kogikoski Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis |
| Grantee: | Marco Aurelio Zezzi Arruda |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/22127-2 - Development of novel materials strategic for integrated analytical devices |
| Grantee: | Lauro Tatsuo Kubota |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/13810-6 - Triboelectric effect as a novel tool for the development and application of point-of-care testing devices |
| Grantee: | Everson Thiago Santos Gerôncio da Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |