期刊
APPLIED SCIENCES-BASEL
卷 12, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/app12042087
关键词
hydrogel; redox materials; electrochemistry; diffusion coefficients
类别
资金
- Fundacao para a Ciencia e a Tecnologia, Portugal [SFRH/BD/77568/2011]
- Associate Laboratory for Green ChemistryLAQV - FCT/MCTES [UIDB/50006/2020]
- iBBInstitute for Bioengineering and Biosciences [UIDB/04565/2020]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/77568/2011] Funding Source: FCT
This study compared the electrode kinetics and diffusion coefficients of two ion sol-gel and ion jelly materials through electrochemical characterization. The results showed a significant decrease in diffusion coefficients for ion jelly and ion sol-gel film modified electrodes, and the ion sol-gel film modified electrode had lower heterogeneous electron transfer constants.
Several hydrogel materials have been proposed for drug delivery systems and other purposes as interfacial materials, such as components for fuel cells and immobilization of biomolecules. In the present work, two materials, an ion sol-gel, based on 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and an ion jelly (1-ethyl-3-methylimidazolium ethylsulfate) film deposited on carbon screen-printed electrodes, were electrochemically characterized. The electrode kinetics of ion jelly and ion sol-gel materials were compared by using ferrocyanide/ferricyanide redox reaction couple as a model redox process. Diffusion coefficients were calculated and compared to those obtained with the model redox couple in non-modified electrodes. Results pointed to a decrease of two and four orders of magnitude in the diffusion coefficients, respectively, for ion jelly and ion sol-gel film modified electrodes. Heterogeneous electron transfer constants for the ferrocyanide/ferricyanide ion redox process were also determined for modified and non-modified electrodes, in which the ion sol-gel film modified electrode presented the lower values. This work sought to contribute to the understanding of these materials' properties, with emphasis on their diffusion, conductivity, and electrochemical behavior, namely reversibility, transfer coefficients, and kinetics, and optimize the most suitable properties for different possible applications, such as drug delivery.
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