Surface-Sensitive Electrochemical Analysis with Jackfish SEC Spectroelectrochemical Cell

Feature Highlights

  • Exceptional quality IR spectra is easily shown by sub-monolayer amounts of adsorbed molecules.
  • Glass and Teflon® materials offer good compatibility with acidic/basic media and organic solvents.
  • Dependable electrical contact with the Au thin-film electrode
  • A cell solution volume of 20 mL
  • Specific ports for counter, long and short gas bubblers, and reference electrodes and exhaust gas trap
  • Simple installation on the VeeMAX III ATR accessory

High Quality IR Spectra

The Jackfish SEC Spectroelectrochemical Cell allows vital studies of the electrified metal-solution interface and applications in molecular self-assembly, interfacial sensing, and next-generation energy solutions. It is designed for surface-sensitive FTIR spectroelectrochemistry using the attenuated total reflectance surface-enhanced infrared spectroscopy (ATR-SEIRAS) technique.

High quality IR spectra can be gathered from sub-monolayer amounts of adsorbed molecules. By the control of the electrical potential applied to the Au thin film electrode on the ATR crystal surface, users can perform vibrational characterization of potential-dependent changes at the interface. By design, the cell is fully compatible with the PIKE VeeMAX III variable angle ATR sampling accessory and face-angled crystal (FAC).

In an earlier study investigating the adsorption of a pyridine derivative, the spectral response was twice as strong when using Si 60 degrees FAC compared to a Si hemisphere with an angle of incidence of 65 degrees. Additionally, the FAC exhibited higher energy throughput and lower spectral noise.

Comparison of electrochemical ATR-SEIRAS response with the VeeMAX III Si 60 degree FAC (black) and a Si hemisphere (red). The sample spectrum is of the Au thin film electrode covered in a monolayer of adsorbed pyridine at positive potential; the reference spectrum is taken at negative potential where the pyridine is completely desorbed.

Jackfish Spectroelectrochemical Cell for Aqueous/Organic Solution Conditions

The Jackfish Spectroelectrochemical Cell is created from highly chemical resistant Teflon and glass for a wide range of aqueous or organic solution conditions.

There are three ports at the top of the cell and side ports for a reference electrode arm and a short bubbler. Typical use of the ports is to support the counter electrode, and to accommodate a long glass bubbler, a short bubbler and an exhaust gas trap. The long glass bubbler allows sparging of the solution volume with inert gas to remove atmospheric oxygen, enabling high-quality electrochemistry and ensuring stability of the Au thin film electrode.

The short gas bubbler creates an inert atmosphere above the electrolyte. Ground glass joints ensure the cell remains sealed from air. Connection to the working electrode is made easily using springloaded pins which contact the Au thin film electrode outside of the solution. This innovative design maintains superior electrical contact over long experiments without degrading the thin film electrode.

Fully Removable Crystal for Ease of Metal Coating

The crystal is fully removable for ease of metal coating. Coating can be performed using a vacuum chamber for sputter coating or through electroless deposition. For users performing electroless deposition, a convenient fixture is available to provide a crystal housing that allows the deposition solution to contact only the crystal top surface during the coating process.

The recommended material for either metal deposition process is silicon because of its excellent chemical stability and favorable wetting characteristics with gold films.

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