A temperature-controlled photoelectrochemical cell for quantitative product analysis

Area of Science:

• Electrochemistry
• Photochemistry
• Analytical Chemistry

Background:

• Traditional electrolytic cells struggle with low current densities and limiting reactant concentrations in photoelectrochemical processes.
• Studying multiple gas and liquid products from illuminated electrodes requires specialized analytical techniques.

Purpose of the Study:

• To design and operate a temperature-controlled photoelectrochemical cell for quantitative analysis of gaseous and liquid products.
• To enable the study of photoelectrochemical processes with multiple products at low current densities.
• To enhance sensitivity for analyzing liquid products using ex situ spectroscopy.

Main Methods:

• A front-illuminated photoelectrochemical cell with maximized electrode surface area to electrolyte volume ratio.
• In-line gas chromatography for gaseous product detection.
• Ex situ nuclear magnetic resonance spectroscopy for liquid product analysis.
• Validation using carbon dioxide reduction on a silver foil electrode.

Main Results:

• The cell successfully analyzed gaseous and liquid products from photoelectrochemical reactions.
• Performance was validated against literature values and standard electrochemical cells.
• CO2 reduction experiments on a plasmonic silver photocathode showed distinct product distributions under dark and illuminated conditions.

Conclusions:

• The developed photoelectrochemical cell is effective for quantitative analysis of multi-product systems.
• The cell design facilitates the study of challenging photoelectrochemical reactions.
• This work advances the analytical capabilities for photoelectrochemical energy conversion research.