| Full text | |
| Author(s): |
R. G Freitas
[1]
;
L. F. Q. P Marchesi
[2]
;
M. R Forim
[3]
;
L. O. S Bulhões
;
E. C Pereira
;
M. C Santos
;
R. T. S Oliveira
Total Authors: 7
|
| Affiliation: | [1] Universidade Federal de São Carlos. Departamento de Química
[2] Universidade Federal de São Carlos. Departamento de Química
[3] Universidade Federal de São Carlos. Departamento de Química
Total Affiliations: 7
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Chemical Society; v. 22, n. 9, p. 1709-1717, 2011-09-00. |
| Abstract | |
This work describes a detailed study of the ethanol electrooxidation on Ti/(RuO2)(x)Pt(1-x) electrodes using several compositions prepared by the polymeric precursor method. The results obtained using cyclic voltammetry and chronoamperometry showed that the best composition of Ti/(RuO2)(x)Pt(1-x) electrodes for CO and ethanol oxidation processes is Ti/(RuO2)0.50Pt0.50. On this electrode composition the onset of CO and the ethanol oxidation occurred at 380 mV and 220 mV more negative than on Ti/Pt, respectively. Besides, there was an increase of 2.5-fold in the current density for ethanol electrooxidation under constant potential polarization. The Ti/(RuO2)0.50Pt0.50 electrodes produced lower amount of acetic acid compared to Ti/Pt and polycrystalline Pt electrodes using in situ HPLC spectrometric analysis. Also, a non common product from ethanol oxidation could be observed on higher RuO2 loads: ethyl acetate. Finally, the impedance data showed that Ti/(RuO2)0.50Pt0.50 electrode composition had the smallest charge transfer resistance for ethanol oxidation among those compositions investigated (AU) | |
| FAPESP's process: | 03/09933-8 - Center for Excellence in Electrochemically Synthesized Nanostructures |
| Grantee: | Ernesto Chaves Pereira de Souza |
| Support Opportunities: | PRONEX Research - Thematic Grants |
| FAPESP's process: | 10/05555-2 - Electrochemical investigation of TiO2-nanotubes formation and its application on energy convertion nanostructured systems |
| Grantee: | Renato Garcia de Freitas Sobrinho |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |