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

Author(s)

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

• Document type: Journal article
• Source: ACS APPLIED MATERIALS & INTERFACES; v. 16, n. 29, p. 9-pg., 2024-07-12.

Abstract

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)

• FAPESP's process: 20/01822-8 - Benchtop fabrication of microgap sensor based on carbon nanomaterials for selective detection of flavonoids
• Grantee: Maísa Azevedo Beluomini
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants