Glucose and 5-hydroxymethylfurfural adsorption at Pt(111) in alkaline media: a cyclic voltammetry study

Autor(es)

Moreti, Lauren dos Santos ; Sitta, Elton

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Electrochemistry; v. N/A, p. 8-pg., 2024-05-21.

Resumo

The electrochemical oxidation of glucose and 5-hydroxymethylfurfural (5-HMF) at Pt(111) was studied in alkaline media focusing on adsorption and surface poisoning at concentrations from 10-6 to 10-1 mol L-1. Glucose was able to interact with Pt(111) and be oxidized at both oxide-free and (hydr-)oxide-covered surfaces, the current being dependent on the glucose concentration. The presence of adsorbed hydroxyl ions (Pt(111)-OH) facilitates the glucose oxidation reaction leading to the lowest surface poisoning along the voltammetric cycles. Contrary, the 5-HMF strongly interacts with Pt(111) and although oxidation currents at Pt(111)-OH region increase with 5-HMF concentration, inhibitory effects are observed for concentrations higher than 10-4 M. The results are explained based on the competition between hydroxyl and 5-HMF adsorption at the surface. According to the literature, the presence of (hydr-)oxides species is essential for furanic compound oxidation after its adsorption. Therefore, the 5-HMF acts as its own poison at high concentrations. In this way, glucose presents a higher activity at Pt(111) than 5-HMF, even in concentrations higher than 10-1 mol L-1. (AU)

• 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: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia