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Plasmonic electrodes enhance electrochemical hydrogen production in nonaqueous solvents. Solvent polarity significantly impacts plasmonic enhancement, with lower water concentration yielding higher photopotentials for efficient energy conversion.

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Area of Science:

  • Electrochemistry
  • Plasmonics
  • Energy Conversion

Background:

  • Plasmon excitation of metal electrodes boosts electrochemical reactions in aqueous media.
  • Low solubility of reagents in water limits reaction rates for energy conversion.
  • Nonaqueous solvents offer an alternative for enhanced electrochemical transformations.

Purpose of the Study:

  • To investigate plasmonic enhancement of electrochemical hydrogen (H2) production in a nonaqueous solvent.
  • To determine the effect of solvent polarity on plasmon-enhanced electrochemistry.
  • To optimize conditions for efficient plasmonic-assisted electrochemical reactions.

Main Methods:

  • Linear sweep voltammetry was employed to study electrochemical H2O reduction.
  • Plasmonically excited, electrochemically roughened gold (Au) electrodes were utilized.
  • Experiments were conducted in acetonitrile with varying concentrations of H2O.

Main Results:

  • Plasmonically excited Au electrodes generated photopotentials up to 175 mV in acetonitrile.
  • These photopotentials reduced the electrical bias needed for H2 formation.
  • Increasing H2O concentration decreased the photopotential to approximately 50 mV.

Conclusions:

  • Plasmonic enhancement of electrochemistry is significantly influenced by solvent polarity.
  • Higher water concentrations stabilize the photocharged electrode, reducing available photopotential.
  • Solvent polarity is a critical parameter for optimizing plasmonic enhancement in electrochemical energy conversion.