Hydrogen Peroxide Production in an Electrochemical Flow-by Reactor using Gas Diffusion Electrodes Modified with Organic Redox Catalysts

Juliane Forti; Mariana Matulovic; Mario Mollo Neto; Felipe Santos; Marcos Lanza; Rodnei  Bertazzoli

doi:10.31686/ijier.vol8.iss7.2463

Authors

Juliane Forti a:1:{s:5:"en_US";s:106:"São Paulo State University (UNESP), School of Sciences and Engineering, Biosystems Engineering Department";}
Mariana Matulovic São Paulo State University (UNESP), School of Sciences and Engineering, Biosystems Engineering Department
Mario Mollo Neto São Paulo State University (UNESP), School of Sciences and Engineering, Biosystems Engineering Department
Felipe Santos São Paulo State University (UNESP), School of Sciences and Engineering, Biosystems Engineering Department
Marcos Lanza University of São Paulo (USP), São Carlos Institute of Chemistry
Rodnei Bertazzoli Campinas State University (UNICAMP)

DOI:

https://doi.org/10.31686/ijier.vol8.iss7.2463

Keywords:

electrochemical flow-by reactor, hydrogen peroxide, gas diffusion electrodes, organic redox catalysts, fuzzy logic decision support

Abstract

This paper presents a proposal to use an electrochemical flow-by reactor for hydrogen peroxide electrogeneration using cathodes formed from the incorporation of organic redox catalysts (2-ethylanthraquinone, 2-tert-butylanthraquinone, alizarin, and azobenzene) in the structure of gas diffusion electrodes. These electrodes help circumvent the low solubility of oxygen in aqueous solutions. Organic redox catalysts, which typically contain quinone or azo groups in their structure, were added to the electrode mass in a 10% proportion. The electrodes were used to study the electrogeneration of hydrogen peroxide in situ, in an acid medium (0.1 mol L^-1 H₂SO₄ and 0.1 mol L^-1 K₂SO₄, pH 1), inside an electrochemical flow-by reactor. Comparative analysis among the different catalysts indicated that the best electrode for hydrogen peroxide electrogeneration was the gas diffusion electrode modified with 10% of 2-ethylanthraquinone. With an underflow rate of 200 L h^-1, hydrogen peroxide was formed with a maximum yield of 998.12 mg L^-1 after 2 h at -2.0 V vs Pt//Ag/AgCl, for which the energy consumption was 11.21 kWh kg^-1. The use of the electrochemical flow-by reactor was much more efficient, in that it yielded higher concentrations of hydrogen peroxide with extremely low energy consumption, compared to that obtained when using an electrochemical cell. In addition, for ensuring appropriate usage of the electrodes, optimizing their potential for the maximum generation of hydrogen peroxide, and obtaining the highest efficiency for the reduction of oxygen, a fuzzy algorithm was developed to help support the user’s decision.

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Author Biography

Rodnei Bertazzoli, Campinas State University (UNICAMP)

Materials Engineering Department, 13083-970, Campinas, SP, Brazil

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