A differential electrochemical mass spectrometer (DEMS) analyses gaseous products, volatile intermediates and final products of electrochemical reactions on-line, qualitatively and quantitatively. The interface between the cell and the mass spectrometer is a hydrophobic gas-permeable membrane, so products are detected as they form.
During a potential sweep the ion current for a selected mass is recorded in parallel with the faradaic current to give a mass voltammogram; when several products form together, the faradaic current of each can be followed against potential or time.
Gas and liquid inlets in one system allow electro-, photo- and thermocatalysis as well as battery gas-evolution studies with the same instrument.
| Detector | Faraday cup + electron multiplier |
| Range | ppb – 100% |
| Inlet | Gas and liquid |
| Software | Multi-component qualitative/quantitative analysis |
The price depends on configuration and is set by quotation; the price shown is indicative.
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