Triphasic Oxygen Storage in Wet Nanoparticulate Polymer of Intrinsic Microporosity (PIM-1) on Platinum: An Electrochemical Investigation

Autor(es)

Beluomini, Maisa Azevedo ; Stradiotto, Nelson Ramos ; Zanoni, Maria Valnice Boldrin ; Carta, Mariolino ; McKeown, Neil B. ; Fletcher, Philip J. ; Sain, Sunanda ; Li, Zhongkai ; Marken, Frank

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 16, n. 29, p. 9-pg., 2024-07-12.

Resumo

The triphasic interaction of gases with electrode surfaces immersed in aqueous electrolyte is crucial in electrochemical technologies (fuel cells, batteries, sensors). Some microporous materials modify this interaction locally via triphasic storage capacity for gases in aqueous environments linked to changes in apparent oxygen concentration and diffusivity (as well as activity and reactivity). Here, a nanoparticulate polymer of intrinsic microporosity (PIM-1) in aqueous electrolyte is shown to store oxygen gas and thereby enhance electrochemical signals for oxygen reduction in aqueous media. Oxygen reduction current transient data at platinum disk electrodes suggest that the reactivity of ambient oxygen in aqueous electrolyte (typically D-oxygen = 2.8 x 10(-9) m(2) s(-1); c(oxygen) = 0.3 mM) is substantially modified (to approximately D-app,D-oxygen = 1.6 (+/- 0.3) x 10(-12) m(2) s(-1); c(app,oxygen) = 50 (+/- 5) mM) with important implications for triphasic electrode processes. The considerable apparent concentration of oxygen even for ambient oxygen levels is important. Potential applications in oxygen sensing, oxygen storage, oxygen catalysis, or applications associated with other types of gases are discussed. (AU)

• Processo FAPESP: 20/01822-8 - Construção de sensor baseado em microgap modificado com nanomateriais de carbono para detecção seletiva de flavonoides
• Beneficiário: Maísa Azevedo Beluomini
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático