Q: I want to multiplex impedance measurements in the time domain between 4-8 working electrodes. Do you sell multiplexers that will do this?
A: Using a potentiostat, Solartron FRA, and Solartron 1281 multiplexer, it is possible to use our ZPlot software to perform EIS measurement on up to 8 electrochemical cells. (See our ZPlot Web page for a list of supported Solartron and PAR instruments.)
The 1281 has eight cell cables, one for each cell. It is normally used with independent cells to do multiple electrochemical experiments at once. You could do this on a single cell (single counter, single reference) with multiple working electrodes by connecting the counter electrode lead of all 8 cell cables to your cell’s counter electrode and all of the RE1 leads to the cell’s reference electrode. Each cell cable’s working electrode lead connects to one of the cell’s working electrodes [up to 8].
If you need to do EIS on an electrochemical cell with up to 100 working electrodes, you can instead use our Model 910 MMA. It is, however, intended for arrays of small electrodes so the maximum current per working electrode segment is limited to 100uA or less, depending on system configuration. The Model 910 also has a frequency response limited to 1kHz. One advantage of the Model 910 is that the potentiostat, FRA, and multiplexing functions are all contained in one small bench top instrument. The Model 910 is controlled by our MMALive software.
For either approach, the impedance data can be analyzed post-measurement with our ZView software.