| Full text | |
| Author(s): |
Santos, Adriano L.
[1]
;
Nagao, Raphael
[1]
;
Oliveira, Cristiane P.
[1]
;
de Lima, Roberto B.
[2]
;
Varela, Hamilton
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Maranhao, Dept Chem, BR-65085580 Sao Luis, MA - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 660, n. 1, p. 147-152, SEP 1 2011. |
| Web of Science Citations: | 5 |
| Abstract | |
We present in this work a comprehensive investigation of the role played by dissolved tetrafluoroboric acid on the electrochemical response of a polycrystalline platinum electrode in acidic media. HBF(4) from two different suppliers was employed and characterized in terms of the amount of arsenic contamination by Inductively Coupled Plasma-Optical Emission Spectroscopy. The effect of different amounts of HBF(4) on the voltammetric profile of the Pt vertical bar HClO(4)(aq) interface was investigated by means of electrochemical quartz crystal nanobalance (EQCN). Despite the comparable cyclic voltammograms, the presence of arsenic in one of the two HBF(4) used resulted in dramatic variations in the mass change profile, which evidences the deposition/dissolution of arsenic prior to the surface oxidation. For the arsenic-free HBF(4), its effect on the mass change profile was mainly associated to anion adsorption. The impact of dissolved HBF(4) on the electro-oxidation of formic acid was rationalized in terms of two contributions: current enhancement at low potentials due to the arsenic-assisted formic acid electro-oxidation and inhibition at high potentials due to anion adsorption. (C) 2011 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities |
| Grantee: | Edson Antonio Ticianelli |
| Support type: | Program for Research on Bioenergy (BIOEN) - Thematic Grants |
| FAPESP's process: | 09/00153-6 - Spatio-temporal self-organization in electrocatalysis |
| Grantee: | Raphael Nagao de Sousa |
| Support type: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 09/16449-1 - Kinetic instabilities in electrocatalysis: mechanism and spatio-temporal dynamics |
| Grantee: | Cristiane Pontes de Oliveira |
| Support type: | Scholarships in Brazil - Post-Doctorate |
| FAPESP's process: | 07/06037-2 - Nanogravimetric study of the surface electrooxidation process of gold |
| Grantee: | Adriano Lopes Santos |
| Support type: | Scholarships in Brazil - Master |