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Fluorine-19 NMR spectroscopy reveals how anions and cations interact within supercapacitor electrodes during charging. The study quantifies ion adsorption and exchange, providing insights into electrolyte behavior for improved energy storage.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Spectroscopy

Background:

  • Supercapacitors store energy via ion adsorption/desorption at electrode interfaces.
  • Understanding ion behavior in porous electrodes is crucial for optimizing performance.
  • Fluorine-19 NMR spectroscopy offers a sensitive probe for local ionic environments.

Purpose of the Study:

  • To investigate the local environments and dynamic behavior of anions in supercapacitor electrodes using (19)F NMR.
  • To quantify changes in adsorbed species populations during electrode charging and discharging.
  • To elucidate the influence of electrolyte composition and concentration on supercapacitor charging mechanisms.

Main Methods:

  • Utilized (19)F Nuclear Magnetic Resonance ((19)F NMR) spectroscopy.
  • Employed nucleus-independent chemical shift (NICS) to distinguish in-pore and ex-pore anions.
  • Conducted adsorption and 2D exchange NMR experiments to study anion dynamics.
  • Recorded in situ (19)F NMR spectra at various electrode charge states.

Main Results:

  • Anions exist in dynamic equilibrium between micropores (in-pore) and larger spaces (ex-pore), with exchange rates in the Hz range.
  • Changes in in-pore anion populations and local environments were observed during charging, monitored via NICS.
  • Electrolyte concentration significantly impacts charging mechanisms: anion adsorption dominates at low concentrations, while ion exchange is more important at high concentrations for tetraethylammonium tetrafluoroborate.
  • Cation adsorption is the primary mechanism during negative polarization for both concentrations.
  • Anion expulsion occurs during negative polarization with tetrabutylammonium tetrafluoroborate and alkali metal bis(trifluoromethane)sulfonimide electrolytes, linked to cation size and mobility.

Conclusions:

  • (19)F NMR spectroscopy effectively probes anion behavior and dynamics within supercapacitor electrodes during operation.
  • Charging mechanisms are complex and depend on electrolyte properties like ion size, concentration, and mobility.
  • Findings provide fundamental insights into ion transport and storage in porous electrode materials, guiding future electrolyte design.