Gas Diffusion Electrode Raman Electrochemical Flow Cell Setup
This cell combines two classical analytical techniques such as electrochemistry and Raman spectroscopy, to obtain in-situ chemical information about the reactions taking place during an electrochemical experiment. It consists mainly of three elements: (i) gas compartment with Tantalum foil serving as an electric contact to Gas Diffusion Electrode (working electrode), (ii) liquid compartment in which reference and counter electrodes are installed together with electrolyte inlet and outlet and (iii) lid which seals the cell and holds the Sapphire window. The sample consisting of Gas Diffusion Electrode typically coated with a catalyst is installed from the bottom of the cell via screw mount (magnetic mount available on request). The counter or/and reference electrodes are mounted in a top casing (either 2-, or 3-electrode setup. The oval counter electrode made of e.g. Platinum wire assures uniform distribution of the field lines along the path to working electrode. During an experiment Raman laser is focused onto the surface of the Gas Diffusion Electrode through a transparent Sapphire window and thin layer of electrolyte (total optical path of 3.25 mm). The electrolyte thickness of 2.25 mm ensures free diffusion of ions (e.g. protons) and its counter ions.
The cell elements are constructed with materials that are inert to the sample (PEEK, Fluorocarbons). It well fits aqueous (FKM O-Rings) and organic solvent (FFKM O-Rings) electrolyte requirements. The construction is gas-tight and can be used when the removal and exclusion of contaminants such as oxygen and water is required by bubbling of an inert gas through the electrolyte (in an external reservoir).
This cell can be used to study GDEs in fuel cells, metal-air batteries, CO2 reduction, etc. Various metals and carbon allotropes are suitable for this cell as auxiliary electrode including Platinum, Gold, Silver, Zinc, Glassy Carbon, Graphite etc.
Nominal exposure area: 3.5 cm2
Electrolyte volume: 4.5 mL
Optical path (including Sapphire window): 3.25 mm
Electrode plug diameter: 6 mm
GDE active surface area: 21 mm dia. (variant 28 mm dia.), 13 mm dia. (variant 18 mm dia.), 8 mm dia. (variant 13 mm dia.) and 5 mm dia. (variant 10 mm dia.)
1 x chamber
1 x Ag/AgCl or non-aqueous Ag/Ag+ 30 mm reference electrode
1 x Metal wire auxiliary electrode – ST 0.6/150 mm, Platinum
1 x Sapphire window - 0054PSPCM
1 x lid
1 x WE copper contact - 0009CCUMA
1 x Gas Compartment
1 x plug – 0005CPEMA
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