| Texto completo | |
| Autor(es): |
Wosiak, Gabriel
;
Staciaki, Felipe
;
Von Stein, Raphaella
;
Pereira, Ernesto
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 106, p. 8-pg., 2025-03-06. |
| Resumo | |
Electrochemical reactions conducted in aqueous electrolytes are normally accompanied by consumption or production of H+/OH- ions, which can lead to significant interfacial pH (pHi) changes near the electrode surface. In electrochemistry the pHi change occurs in various processes and plays a role impact in reactions increasing the energy consumption and, consequently, negatively affecting the process efficiency. In this paper, we present a simple and scalable method to mitigate the pHi changes by using a cell design with electrode asymmetry increasing the anode area relative to the cathode area, thereby reducing energy consumption. This configuration has been tested in alkaline wa-ter electrolysis using a multivariate approach in both laboratory and industrial current density conditions, and the results were supported by numerical simulations. The results indicated that an increase in the ratio between electrode areas reduces the cell potential and energy consumption, improving the energy efficiency (11.6%). The simulations demonstrated that when the area quotient (AQ) is 30, the interfacial pH changes is 397.4 times slower compared to an AQ = 1. Finally, under high current conditions, the asym-metric electrode configuration significantly reduces the cell potential leading to 17.1% of saved energy at jcat = 200 mA cm- 2. These results indicate that the method can be scaled and applied in various settings, offering a promising solution to the challenge of mitigating the interfacial pH changes and improving energy efficiency and performance in electrochemical processes, especially industrial applications. (AU) | |
| Processo FAPESP: | 21/11630-1 - Desenvolvimento de novos materiais e métodos para dessalinização capacitiva |
| Beneficiário: | Felipe Staciaki da Luz |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| 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 Aplicada |
| Processo FAPESP: | 18/24383-0 - Síntese de novos materiais de eletrodo e de reações redox utilizando ferramentas eletroquímicas acopladas a micro-ondas |
| Beneficiário: | Gabriel Wosiak Leite |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| 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: | 22/05254-0 - Redução eletroquímica de dióxido de carbono visando a síntese de precursores de materiais poliméricos |
| Beneficiário: | Eryka Thamyris Damascena Nobrega Cavalcanti |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock |
| Beneficiário: | Arlene Gonçalves Corrêa |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |