| Full text | |
| Author(s): |
Arjunan, Ananthi
[1, 2]
;
Sukeri, Anandhakumar
[1]
;
Saraiva, Douglas Philip Martinez
[2]
;
Miranda, Paulo Barbeitas
[1]
;
Bertotti, Mauro
[2]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of the Electrochemical Society; v. 167, n. 11 JAN 8 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
A nanoporous gold (NPG) surface with high electroactive surface area and roughness factor was prepared via anodization-electrochemical reduction method and was used as a new platform to study the electrochemical oxidation of hydrogen peroxide (H2O2). Field-emission scanning electron microscopy (FE-SEM) analysis, cyclic voltammetry, and amperometry techniques were employed for structural morphology and electrochemical studies. The H(2)O(2)oxidation peak potential was significantly shifted (similar to 0.23 V) towards a less positive direction with increased current response at the NPG surface compared to that of a bare gold electrode. The mechanism for the H(2)O(2)anodic oxidation at the NPG surface was proposed based on the calculated transfer coefficient (alpha= 0.32) and the total number of electrons involved (n = 2.0) in the electrochemical process. Besides, the diffusion coefficient (D) of H(2)O(2)in PBS solution was also calculated using the Randles-Sevcik equation (2.18 x 10(-5)cm(2)s(-1)). In addition, the analytical application of the NPG electrode was demonstrated by amperometric detection of H(2)O(2)at a relatively less positive potential (0.57 V). The current increased proportionally to H(2)O(2)concentration in the linear range of 0.01 to 1.8 mM and the detection limit was found to be 0.6 mu M (S/N = 3). (AU) | |
| FAPESP's process: | 18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications |
| Grantee: | Mauro Bertotti |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/02819-0 - Interaction of chitosans and surfactants with cell membrane models investigated by nonlinear vibrational spectroscopy |
| Grantee: | Paulo Barbeitas Miranda |
| Support Opportunities: | Regular Research Grants |