Azevedo Beluomini Maisa, Ramos Stradiotto Nelson, Boldrin Zanoni Maria Valnice, Carta Mariolino, McKeown Neil B, Fletcher Philip J, Sain Sunanda, Li Zhongkai, Marken Frank
Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
Institute of Chemistry, São Paulo State University (UNESP), 14800-060 Araraquara, São Paulo, Brazil.
ACS Appl Mater Interfaces. 2024 Jul 24;16(29):37865-37873. doi: 10.1021/acsami.4c04459. Epub 2024 Jul 12.
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 = 2.8 × 10 m s; = 0.3 mM) is substantially modified (to approximately = 1.6 (±0.3) × 10 m s; = 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.
气体与浸没在水性电解质中的电极表面之间的三相相互作用在电化学技术（燃料电池、电池、传感器）中至关重要。一些微孔材料通过与表观氧浓度和扩散率（以及活性和反应性）变化相关的水性环境中气体的三相存储能力来局部改变这种相互作用。在此，水性电解质中的固有微孔纳米颗粒聚合物（PIM-1）被证明可存储氧气，从而增强水性介质中氧还原的电化学信号。铂盘电极上的氧还原电流瞬态数据表明，水性电解质中环境氧的反应性（通常为 = 2.8 × 10 m s； = 0.3 mM）被大幅改变（至约 = 1.6 (±0.3) × 10 m s； = 50 (±5) mM），这对三相电极过程具有重要意义。即使对于环境氧水平，氧的可观表观浓度也很重要。还讨论了在氧传感、氧存储、氧催化或与其他类型气体相关的应用中的潜在应用。
