Modeling the electrosynthesis of H2O2: Understanding the role of predatory species

Autor(es)

Cordeiro-Junior, Paulo Jorge Marques ; Lanza, Marcos Roberto de Vasconcelos ; Rodrigo, Manuel Andres Rodrigo

• Tipo de documento: Artigo Científico
• Fonte: Chemical Engineering Science; v. 273, p. 10-pg., 2023-03-23.

Resumo

In this work, the electrosynthesis of hydrogen peroxide from the oxygen reduction reaction is evaluated using a flow-by electrochemical cell under different operation conditions and electrodes. In addition, a phenomenological model is proposed to understand the processes that occur inside the electrochemical reactor, and how the predatory species act against the production of H2O2 at high concentrations. In com-paring different types of anodes, the electrosynthesis of H2O2 is almost twice as efficient when using DSA-Cl2 instead of BDD as the anode, which allowed it to reach concentrations as high as 4.2 g L-1. The rate of decomposition of H2O2 is higher when the more vigorous anode is used. This decomposition is not only caused by the H2O2 on the anode surface or by its self-decomposition within the bulk, but it is mostly related to the electrochemical processes of production of H2O'2s predatory species such as ozone and per-oxymonopersulfate. The formulated phenomenological model explains and satisfactorily reproduces the influence of anode type, electrolyte, and current density on the electrosynthesis of H2O2 at high concen-trations obtaining regression coefficients higher than 0.99. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

• Processo FAPESP: 20/13088-7 - Eletrodos de difusão de gasosa modificado aplicado na degradação de poluentes orgânicos em um reator eletroquímico de fluxo
• Beneficiário: Paulo Jorge Marques Cordeiro Junior
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 17/10118-0 - Estudo e aplicação da tecnologia eletroquímica para a análise e a degradação de interferentes endócrinos: materiais, sensores, processos e divulgação científica
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/19612-4 - Degradação dos desreguladores endócrinos carbofurano, metilparabeno e propilparabeno via H2O2 eletrogerado e processos associados (H2O2 eletrogerado/UV, eletro-Fenton e fotoeletro-Fenton)
• Beneficiário: Paulo Jorge Marques Cordeiro Junior
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto