Coupled Dynamics of Anode and Cathode in Proton-Exchange Membrane Fuel Cells

Autor(es)

Nogueira, Jessica A. ; Krischer, Katharina ; Varela, Hamilton

• Tipo de documento: Artigo Científico
• Fonte: ChemPhysChem; v. 20, n. 22, p. 8-pg., 2019-08-05.

Resumo

An external reference electrode was used to monitor individually the evolution of the anodic and cathodic potentials during the stationary as well as oscillatory operation of a Direct Formic Acid Fuel Cell (DFAFC) and a Direct Methanol Fuel Cell (DMFC). Besides evidencing the large activation loss in both cells, we were able to observe how the oscillatory operation of such devices affects their cathodes. In fact, cathodic oscillations synchronized with the cell voltage dynamics were observed, hitherto never reported on fuel cells. We have addressed these phenomena taking into account two main coupling processes: through the proton concentration and a global coupling stemming from the control mode (potentiostatic or galvanostatic). (AU)

• Processo FAPESP: 15/09295-9 - Comportamento dinâmico em células a combustível de baixa temperatura baseadas na oxidação de moléculas orgânicas pequenas
• Beneficiário: Jéssica Alves Nogueira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/17644-9 - Estabilidade de eletrocatalisadores frente à eletro-oxidação de moléculas orgânicas
• Beneficiário: Jéssica Alves Nogueira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático