| Full text | |
| Author(s): |
Ottoni, Cristiane Angelica
[1]
;
da Silva, Sirlane G.
[2]
;
De Souza, Rodrigo F. B.
[2]
;
Oliveira Neto, Almir
[2]
Total Authors: 4
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Biosci Inst, Coastal Campus, BR-11330900 Sao Vicente - Brazil
[2] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes, 2242 Cidade Univ, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | IONICS; v. 22, n. 7, p. 1167-1175, JUL 2016. |
| Web of Science Citations: | 10 |
| Abstract | |
Glycerol oxidation reactions were evaluated using PdAu/C electrocatalysts under alkaline conditions. These electrocatalysts were synthesized in different ratios (100:0, 75:25, 50:50, 25:75, and 0:100), using the borohydride reduction method. The materials were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical techniques associated by in situ attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR). According to the XRD diffractograms, the presence of Pd and Au (face-centered cubic (fcc)) phases and Pd-Au (fcc) alloys were detected. Cyclic voltammetry assisted by ATR-FTIR in situ and chronoamperometry experiments revealed that the addition of Au remarkably enhances the electrocatalytic activity, due to the action of bifunctional effect, with addition of the interactions of alcohoxide with hydroxylate species in gold surface, and the stability of Pd/C catalysts. Highest current density (approximate to 4 mA mg(metal)(-1)) was achieved for the catalyst Pd50Au50/C and Pd75Au25/C, which is two times higher than that achieved by Pd/C (2 mA mg(metal)(-1)), demonstrating the beneficial effect of the PdAu alloy. (AU) | |
| FAPESP's process: | 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells |
| Grantee: | Marcelo Linardi |
| Support Opportunities: | Research Projects - Thematic Grants |