| Full text | |
| Author(s): |
Bott-Neto, Jose L.
[1, 2]
;
Martins, Thiago S.
[2]
;
Machado, Sergio A. S.
[2]
;
Ticianelli, Edson A.
[2]
Total Authors: 4
|
| Affiliation: | [1] State Univ Campinas UNICAMP, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Chem, POB 780, BR-13560970 Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | ACS APPLIED MATERIALS & INTERFACES; v. 11, n. 34, p. 30810-30818, AUG 28 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
This study describes a systematic investigation of the electrocatalytic activity of poly{[}Ni(salen)] films, as catalysts for the electrooxidation of Cn alcohols (Cn = methanol, ethanol, and glycerol) in alkaline medium. The {[}Ni(salen)] complex was electropolymerized on a glassy carbon surface and electrochemically activated in NaOH solution by cyclic voltammetry. X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy results indicate that during the activation step the polymeric film hydrolyzes, leading to the formation of beta-Ni(OH)(2) spherical nanoparticles, with an average size of 2.4 +/- 0.5 nm, encapsulated with the poly{[}Ni(salen)] film. Electrochemical results obtained together with the in situ Fourier transform infrared spectroscopy confirm that the electrooxidation of methanol, ethanol, and glycerol occurs by involving a cycling oxidation of beta-Ni(OH)(2) with the formation of beta-NiOOH species, followed by the charge transfer to the alcohols, which regenerates beta-Ni(OH)(2). Analyses of the oxidation products at low potentials indicate that the major product obtained during the oxidation of methanol and glycerol is the formate, while the oxidation of ethanol leads to the formation of acetate. On the other hand, at high potentials (E = 0.6 V), there is evidence that the oxidation of Cn alcohols leads to carbonate ions as an important product. (AU) | |
| FAPESP's process: | 16/12759-0 - Development of an advanced electroanalytical methodology for quantification of the hormones 17²-estradiol and 17±-etinilestradiol in supply water samples using electrodes modified with graphene, gold nanoparticles and quantum dots |
| Grantee: | Sergio Antonio Spinola Machado |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion |
| Grantee: | Edson Antonio Ticianelli |
| Support Opportunities: | Research Projects - Thematic Grants |