| Full text | |
| Author(s): |
Freitas, R. G.
[1]
;
Marchesi, L. F. Q. P.
[1]
;
Forim, M. R.
[1]
;
Bulhoes, L. O. S.
[1, 2]
;
Pereira, E. C.
[1]
;
Santos, M. C.
[3]
;
Oliveira, R. T. S.
[4]
Total Authors: 7
|
| Affiliation: | [1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[2] Ctr Univ Cent Paulista, CENIP, BR-13563470 Sao Carlos, SP - Brazil
[3] Univ Fed ABC, LEMN, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[4] Univ Fed Triangulo Mineiro, Inst Ciencias Biol & Nat, BR-38025180 Uberaba, MG - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Chemical Society; v. 22, n. 9, p. 1709-1717, SEP 2011. |
| Web of Science Citations: | 10 |
| Abstract | |
This work describes a detailed study of the ethanol electrooxidation on Ti/(RuO(2))((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/(RuO(2))((x))Pt((1-x)) electrodes for CO and ethanol oxidation processes is Ti/(RuO(2))(0.50)Pt(0.50). 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/(RuO(2))(0.50)Pt(0.50) 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 RuO(2) loads: ethyl acetate. Finally, the impedance data showed that Ti/(RuO(2))(0.50)Pt(0.50) electrode composition had the smallest charge transfer resistance for ethanol oxidation among those compositions investigated. (AU) | |
| 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 |
| 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 |