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Low content cerium oxide nanoparticles on carbon for hydrogen peroxide electrosynthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
41262 45883 2012 6 PDF Available
Title
Low content cerium oxide nanoparticles on carbon for hydrogen peroxide electrosynthesis
Abstract

A comparative study using different proportions of CeO2/C (4%, 9% and 13% CeO2) was performed to produce H2O2, a reagent used in the oxidation of organic pollutants and in electro-Fenton reactions for the production of the hydroxyl radical (OH), a strong oxidant agent used in the electrochemical treatment of aqueous wastewater. The CeO2/C materials were prepared by a modified polymeric precursor method (PPM). X-ray diffraction analysis of the CeO2/C prepared by the PPM identified two phases, CeO2 and CeO2−x. The average size of the crystallites in these materials was close to 7 nm. The kinetics of the oxygen reduction reaction (ORR) were evaluated by the rotating ring-disk electrode technique. The results showed that the 4% CeO2/C prepared by the PPM was the best composite for the production of H2O2 in a 1 mol L−1 NaOH electrolyte solution. For this material, the number of electrons transferred and the H2O2 percentage efficiency were 3.1 and 44%, respectively. The ring-current of the 4% CeO2/C was higher than that of Vulcan carbon, the reference material for H2O2 production, which produced 41% H2O2 and transferred 3.1 electrons per molecule of oxygen. The overpotential for this reaction on the ceria-based catalyst was substantially lower (approximately 200 mV), demonstrating the higher catalytic performance of this material. Gas diffusion electrodes (GDE) containing the catalyst were used to evaluate the real amount of H2O2 produced during exhaustive electrolysis. The 4% CeO2/C GDE produced 871 mg L−1 of H2O2, whereas the Vulcan carbon GDE produced a maximum amount of only 407 mg L−1. Thus, the 4% CeO2/C electrocatalyst prepared by the PPM is a promising material for H2O2 electrogeneration in alkaline media.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (189 K)Download as PowerPoint slideHighlights► 4% CeO2/C was the best choice for H2O2 electrogeneration among all materials used. ► 4% CeO2/C transferred 3.1 electrons and had a H2O2 percentage efficiency of 44%. ► Gas diffusion electrodes containing 4% CeO2/C produced 871 mg L−1 of H2O2. ► X-ray diffraction analysis identified two phases for 4% CeO2/C (CeO2 and CeO2−x).

Keywords
Oxygen reduction reaction; Electrogeneration of hydrogen peroxide; Cerium oxides; Low content
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 411–412, 16 January 2012, Pages 1–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us