Electrocatalysis and photoelectrocatalysis produce gases while an electrochemical measurement is running on the same cell. Using an online micro-gas system in these settings has a specific challenge: the electrolyte and its bubbles must never disturb the detector, while the gas path must never disturb the potentiostat.
Keep the carrier sweep gentle so the headspace pressure stays near ambient; pressure fluctuations at the electrode surface add noise to the current. Use non-conductive tubing near the cell and confirm that connecting the gas train does not create a second current path or an antenna for the potentiostat.
A trap or membrane separator between the cell and the analyzer blocks electrolyte mist and vapor. Bubbles entering the line cause spurious spikes, so position the outlet above the liquid level and let bubbles disengage freely before the sweep zone.
Simultaneously log potential, current, carrier flow and gas signal on one time base. Faradaic efficiency and product selectivity both come from the ratio between charge and gas, so the two data streams must be comparable in time alignment.
Both systems quantify micromole-scale gas streams continuously; they differ in detector configuration and product coverage. Choose by the products you must monitor and the throughput of your lab, CO, CH4 and H2 coverage, single-channel or multi-channel workflows.
See gas detection products for the Ugas series and photoelectrocatalysis systems for the paired electrochemical hardware.
