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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Comparative Study of Different Methods for the Preparation of CoxOy/C for the Electrosynthesis of Hydrogen Peroxide

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Author(s):
Assumpcao, M. H. M. T. [1] ; Rascio, D. C. [1] ; Ladeia, J. P. B. [1] ; De Souza, R. F. B. [1] ; Neto, E. Teixeira [1] ; Calegaro, M. L. [2] ; Oliveira, R. T. S. [3] ; Gaubeur, I. [1] ; Lanza, M. R. V. [2] ; Santos, M. C. [1]
Total Authors: 10
Affiliation:
[1] UF ABC, LEMN, CCNH, BR-09210170 Santo Andre, SP - Brazil
[2] USP, IQSC, BR-13566590 Sao Carlos, SP - Brazil
[3] Fac Ciencias Exatas & Sociais Aplicadas, Diamantina, MG - Brazil
Total Affiliations: 3
Document type: Journal article
Source: International Journal of Electrochemical Science; v. 6, n. 5, p. 1586-1596, MAY 2011.
Web of Science Citations: 13
Abstract

A comparative study of the sol-gel method (SGM) and polymeric precursor method (PPM) for the synthesis of CoxOy/C electrocatalysts has been performed. CoxOy/C electrocatalysts can electrogenerate hydrogen peroxide (H(2)O(2)), which is desirable for the electrochemical treatment of effluent containing organic pollutants in aqueous or non-aqueous medium. The results showed that SGM was superior for the synthesis of CoxOy/C catalysts for H(2)O(2) electrogeneration. Analysis of Xray diffraction for CoxOy/C prepared by PPM identified only one phase comprising Co(3)O(4). Besides for CoxOy/C prepared by SGM a mixture of oxides was observed: CoO and Co(2)O(4). The average size of crystallites in this material was 5 nm. A rotating ring-disc electrode was used for electrochemical analysis of the oxygen reduction reaction (ORR). The results showed that the SGM was better than PPM for H(2)O(2) electrogeneration since it showed the highest ring-currents. Results also indicate that the number of electrons transferred in the ORR for SGM and PPM were 2.4 and 3.5, while the percentage of H(2)O(2) formed was 78 % and 23 %, respectively. The results were obtained in a 1 M NaOH and 1 M H(2)SO(4) electrolytes. CoxOy/C synthesized with SGM is a promising material for the production of H(2)O(2). (AU)

FAPESP's process: 10/04539-3 - Synthesis and characterization of nanostructured electrocatalysts for hydrogen peroxide in situ obtention and subsequent degradation of organic pollutants
Grantee:Mônica Helena Marcon Teixeira Assumpção
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 07/04759-0 - Gas diffusion electrodes modified by organometallic compounds for hydrogen peroxide production
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Regular Research Grants
FAPESP's process: 09/09145-6 - Study of ethanol electrochemical oxidation mechanism on PtSn, PtCe and PtSnCe using in-situ spectroscopic techniques
Grantee:Rodrigo Fernando Brambilla de Souza
Support type: Scholarships in Brazil - Doctorate