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Manipulating meso-scale solvent structure from Pd nanoparticle deposits in deep eutectic solvents.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Deep Eutectic Solvents (DESs) possess unique hydrogen bond networks, differing from aqueous electrolytes and ionic liquids.
  • DESs exhibit nanoscale structures, presenting both challenges and opportunities for electrochemical applications.
  • The properties of DESs are highly sensitive to their composition and temperature.

Purpose of the Study:

  • To investigate the near-interface solvent structure of DESs during electrodeposition.
  • To understand how solvent structure is affected by applied potential and DES composition.
  • To explore the relationship between solvent structure and electrodeposition of Palladium (Pd) nanoparticles.

Main Methods:

  • In situ sample-rotated ultra-small angle X-ray scattering (USAXS) to probe nanoscale structure.
  • Electrochemical impedance spectroscopy (EIS) to analyze interfacial properties.
  • Molecular dynamics (MD) simulations and dipolar orientation analysis for theoretical insights.

Main Results:

  • A hierarchical solvent structure was observed on the mesoscale in choline chloride-based DESs.
  • This structure intensified within a specific potential range (-0.3 V to -0.9 V vs Ag/AgCl).
  • The ethylene glycol system showed a more pronounced structure compared to the urea system, correlating with electrochemical data.

Conclusions:

  • The observed solvent structure is tunable by altering the hydrogen bond donor (HBD) in the DES and the applied electrochemical potential.
  • Long-range solvent-deposit interactions are significantly influenced by DES composition and potential.
  • Understanding these interfacial solvent dynamics is crucial for optimizing DES-based electrochemical processes.