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Capacitance of thin films containing polymerized ionic liquids. | LitMetric

AI Article Synopsis

  • Electrode-polymer interfaces are crucial for the properties of thin films, including capacitance and charge transport, but their structure and behavior under high concentrations are not well understood.
  • The study involved an imidazolium-based polymerized ionic liquid (PolyIL) and utilized techniques like dielectric spectroscopy and neutron reflectivity to explore electric field effects on these interfaces.
  • Findings revealed a unique "camel-shaped" capacitance-voltage relationship linked to the behavior of a polymer layer on electrodes, with implications for optimizing molecular weight and improving energy storage technologies.

Article Abstract

Electrode-polymer interfaces dictate many of the properties of thin films such as capacitance, the electric field experienced by polymers, and charge transport. However, structure and dynamics of charged polymers near electrodes remain poorly understood, especially in the high concentration limit representative of the melts. To develop an understanding of electric field-induced transformations of electrode-polymer interfaces, we have studied electrified interfaces of an imidazolium-based polymerized ionic liquid (PolyIL) using combinations of broadband dielectric spectroscopy, specular neutron reflectivity, and simulations based on the Rayleigh's dissipation function formalism. Overall, we obtained the camel-shaped dependence of the capacitance on applied voltage, which originated from the responses of an adsorbed polymer layer to applied voltages. This work provides additional insights related to the effects of molecular weight in affecting structure and properties of electrode-polymer interfaces, which are essential for designing next-generation energy storage and harvesting devices.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7319767PMC
http://dx.doi.org/10.1126/sciadv.aba7952DOI Listing

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