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Paired Electrosynthesis at Interdigitated Microband Electrodes: Exploring Diffusion and Reaction Zones in the Absence of a Supporting Electrolyte

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Autor(es):
Liu, Tingran ; Carneiro-Neto, Evaldo Batista ; Pereira, Ernesto ; Taylor, James E. ; Fletcher, Philip J. ; Marken, Frank
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: ACS MEASUREMENT SCIENCE AU; v. 4, n. 3, p. 13-pg., 2024-04-17.
Resumo

Electrosynthesis traditionally requires dedicated reactor systems and an added electrolyte, although some paired electrosynthesis processes are possible at interdigitated microband electrodes simply immersed in solution and without an intentionally added electrolyte. Here, 1,1 '-ferrocenedimethanol oxidation and activated olefin electro-hydrogenation reactions are investigated as model processes at a Pt-Pt interdigitated microband array electrode with 5 mu m width and with 5 mu m interelectrode gap. Voltammetric responses for electro-hydrogenation are discussed, and product yields are determined in methanol (MeOH) in the presence/absence of an added electrolyte (LiClO4). An isotope effect is observed in CH3OD solvent, leading to olefin monodeuteration linked to a fast EC-type process close to the cathode surface (in the cathode reaction zone) rather than to charge annihilation in the interelectrode zone. A finite element simulation is employed to visualize/discuss reaction zones and to contrast the rate of charge annihilation processes with/without a supporting electrolyte. (AU)

Processo FAPESP: 22/06229-9 - Transporte eletroosmótico retificado de fármacos
Beneficiário:Evaldo Batista Carneiro Neto
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 21/03592-2 - Modelagem e simulação de dispositivos eletroquímicos por elementos finitos
Beneficiário:Evaldo Batista Carneiro Neto
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado