How to measure current in this circuit?

Other Hardware Sensors
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I'm doing my graduate paper work and i'm building an potentiostat to do eletrochemical analysis. In our reference paper, i found an circuit that i'm following to create the device.

As we read the paper, it wasn't so clear how the guy was measuring current, but he does that to create the amperometry graphic. Can you guys help me to understand how this current is being measure?

image

I understand the shunt resistor concept that he said he's using to measure current, but i can't undestand how he applied it.

Here is the paper:
https://pubs.acs.org/doi/10.1021/acs.jchemed.8b00340

The WE, CE and RE are eletrodes that go in a eletrolytical cell, where a reaction is going on, in this particular case, between I2 and ascorbic acid (vitamin C). The potencial aplied to this cell will start the reaction.

Here is an explanation of potentiostat work: What is a Potentiostat and how does it work? – Pine Research Instrumentation Store

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may be if you share a link to the paper that would help forum members help you

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Measure what current?

I'm willing to guess that something is connected to CE, WE and RE (otherwise the circuit is nonfunctional) but what?

Post a link the the paper.

1 Like
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Just uptaded

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Please do not modify the original post. Doing so makes the thread very difficult for others to follow.

The posted circuit does not make much sense to me, especially the op amp connected to CE, with just a 1000pF capacitor for feedback. That creates a short term integrator, or slow comparator, with output either about 5V or 0V.

Write to the authors and ask them to explain it.

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