Mass Spectrometry & Spectroscopy

Spectroelectrochemistry with ATR-SEIRAS

Jun 20 2018 Read 259 Times

The Jackfish Spectroelectrochemical Cell (SEC) is a complete, out-of-the-box solution designed for surface-sensitive FTIR spectroelectrochemistry using the attenuated total reflectance surface-enhanced infrared spectroscopy (ATR-SEIRAS) technique. It enables fundamental studies of the electrified metal-solution interface and applications in molecular self-assembly, interfacial sensing, and next-generation energy solutions. High quality IR spectra can be obtained from sub-monolayer amounts of adsorbed molecules. By controlling the electrical potential applied to the Au thin film electrode on the ATR crystal surface, one can perform vibrational characterisation of potential-dependent changes at the interface.

The Jackfish is designed exclusively for Pike Technologies’ VeeMAX III variable angle ATR sampling accessory. It is constructed from chemically-resistant Teflon and glass for a broad range of aqueous or organic solutions. 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. Ground glass joints ensure the cell remains sealed from air. Connection to the working electrode is made easily using spring-loaded 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.

The VeeMAX III’s unique face-angle crystal (FAC) prism is fully removable for ease of metal coating, and exhibits higher energy throughput and lower spectral noise than traditional hemispheres. In a previous study investigating the adsorption of a pyridine derivative, the spectral response was two times stronger when using Si 60° FAC prism compared to a Si hemisphere with an angle of incidence of 65°.

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