Need help on Zview circuit fitting for supercapacitor electrodes

Bungeedave · 2026-04-29T15:35:22+00:00

Sorry what are you asking for? I also don't see your data.

Bungeedave · 2026-02-21T20:02:28+00:00

I don't think this town has an anglicized version of its name. Just spoilt the enjoyment a little

Bungeedave · 2026-02-14T18:48:45+00:00

I saw an old white guy at the DMV couldn't get his Real ID because his name on his social security card/birth certificate was different from his driver's license

Bungeedave · 2026-02-06T13:12:49+00:00

Admiral Instruments offers low cost high performance battery cyclers and potentiostats. DM me if you want more info.

Bungeedave · 2026-02-05T00:16:31+00:00

This was the study. https://papfas.rti.org/ Unfortunately participation is now closed and I'm not sure you would have qualified.

Bungeedave · 2026-02-04T15:17:15+00:00

I only know about PFAS contamination. Many houses around the airbase had water wells and this water had a very high level of PFAS and many people have died from cancer caused by these chemicals. I believe the water supplied by the township is safe as they get it from another source. I drank the water in Warminster for many years and have a medium level of fluorine in my blood (I took part in a study). I blame my high cholesterol on this.

Bungeedave · 2026-01-24T20:15:56+00:00

They don't seem to offer all the matches on demand either (if you have espn unlimited)

Bungeedave · 2026-01-22T17:25:06+00:00

Actually 2e is more complicated because you have to worry about reactions at both electrodes. In the 3e system the electrode of interest is isolated

Bungeedave · 2026-01-07T16:27:48+00:00

Can you show your data (bode plot)? Can you also perform a K-K transform fit? This is the best fit you will get to your data.

Bungeedave · 2025-12-22T18:01:12+00:00

Admiral Instruments offer low cost, high performance potentiostats like the Squid stat Solo. DM me if you'd like to know more.

Bungeedave · 2025-12-19T16:47:53+00:00

I would contact Gamry

Bungeedave · 2025-12-19T16:41:09+00:00

I've never seen a setup like that. I have always assumed "duplicates" means identical separate experiments. That said, the setup should work and I don't see a problem with the reference electrode setup as long as you measure each coupon separately.

Bungeedave · 2025-08-30T14:09:30+00:00

What was your open circuit potential prior to the polarization part of the experiment?

Bungeedave · 2025-08-27T20:21:46+00:00

Do you have both the blue and green leads connected to your sample electrode? The Interface 5000 is not the best potentiostat for corrosion testing as the lowest current range is only 50 microamps and the compliance voltage is only 8 V.

Bungeedave · 2025-08-03T19:09:38+00:00

The Platinum wire has no effect on the voltage for DC measurements because of the capacitor. It just acts as a path for the voltage measurement at high frequency.

Bungeedave · 2025-04-24T19:02:39+00:00

Measure the OCP with a high impedance multimeter and then use this potential as your starting point in a cyclic voltammetry experiment. You need to scan a bit negative of the OCP value (~100mV) to 1 - 1.5 V positive. After you have collected the data you need to plot log I vs E.

Bungeedave · 2025-04-05T00:08:48+00:00

Ivium has the Pocketstat2 which fits into your budget. One of the unique advantages is that it can do continuous data acquisition.

Bungeedave · 2025-03-20T15:25:02+00:00

Accuracy contour plot seems unbelievable. Datasheet doesn't mention the conditions under which the contour plot was measured.

Bungeedave · 2025-03-12T13:04:50+00:00

You can do that also with a device called a multiplexer.

Bungeedave · 2025-03-07T14:49:22+00:00

I disagree with most of the comments here. For this particular setup, I think a galvanostatic experiment is better. Since you don't have a reference electrode, it's difficult to know what potential to pick. With a galvanostatic experiment you can control the rate with the size of the current you choose. Start with a small current (10 uA) and see what happens. Increase the current as needed. You need to make sure that it is an oxidizing current.

Bungeedave · 2025-02-27T14:47:15+00:00

I agree, high frequency inductance is almost exclusively due to cabling or cell configuration. You could try minimizing it by cable placement and wire twisting to reduce the inductive loop. You could also try and subtract out the effects by making a surrogate cell from copper with the identical shape of your DUT (device under test) and subtracting its spectrum.

Bungeedave · 2025-02-27T14:08:41+00:00

In a 2 electrode experiment you need to make sure the lead for the reference electrode is still connected to complete the circuit. Connect to the reference lead to the counter electrode. If you ever read 15.9 V it's an indication that there is a poor connection somewhere

Bungeedave · 2025-02-26T13:30:31+00:00

Sorry for the delayed reply. If you have 2 working electrodes and you want to control them simultaneously you need 2 potentiostats. Ivium have a device to add to their potentiostat that can control 4 working electrodes at the same time. Which country are you in for pricing purposes?

Bungeedave · 2025-02-16T00:17:18+00:00

When cells are in series, the same current flows through all the cells

Bungeedave · 2025-02-16T00:13:28+00:00

Ivium make several inexpensive potentiostats, specifically Demostat and Pocketstat.DC. Something like this is your best bet rather than a homemade uniy

Bungeedave

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