| Texto completo | |
| Autor(es): |
de Oliveira, Leticia C. F.
;
Santos, Matheus
;
Curvelo, Antonio A. S.
;
Dourado, Andre H. B.
;
Varela, Hamilton
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 548, p. 7-pg., 2026-02-01. |
| Resumo | |
Electrobiorefinery is a green alternative for new feedstocks, such as lignocellulosic biomass from industry, can be turned into high value-added products, by electrocatalytic processes, which efficiently converts electric energy into chemical bonds. In the present work, lignin electrochemical oxidation reaction (LEOR) was investigated on Ni surfaces, and the morphology and temperature were evaluated. First, macromorphology was investigated, using plate and foam electrodes. The first was more active, (current is around 3 times higher) while the second was more selective (16.42 vs. 23.97 % Faradaic Efficiency (FE) for total aldehydes and 24.02 vs. 37.74 % FE for total ketones, plate vs. foam at 1.40 VRHE), differences that were rationalized by the presence of desorbed intermediates and mass transport properties. In situ Raman spectroscopy has shown that, even with these differences, the same reaction was taking place, and that the disorganized gamma-NiOOH, was the preferential Ni active species, unexpectedly considering the literature knowledge for oxygen evolution reaction on Ni based material. Mild temperatures were more selective, but the electrochemical kinetic limitations were unchanged with the temperature, showing that the rate limiting step would be the first oxidative one, which generate radical intermediates. (AU) | |
| Processo FAPESP: | 20/01177-5 - Da ciência fundamental à aplicada: novas fronteiras em tecnologias de células a combustível |
| Beneficiário: | Nigel Peter Brandon |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa SPEC |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 22/06405-1 - Eletrólise assistida da água |
| Beneficiário: | André Henrique Baraldi Dourado |
| Modalidade de apoio: | Auxílio à Pesquisa - Projeto Geração |
| Processo FAPESP: | 19/22183-6 - Electrocatálise VI: aspectos fundamentais e aplicados em problemas emergentes e clássicos em conversão eletroquímica de energia |
| Beneficiário: | Edson Antonio Ticianelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/09630-3 - Reforma Eletrocatalítica de Lignina em Meio Alcalino: Estudo da Cinética e Mecanismos para Maior Produção de Hidrogênio |
| Beneficiário: | André Henrique Baraldi Dourado |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |