A Guide to Multi-Channel Potentiostats: Types and Architectures

What does “multi-channel potentiostat” really mean

If you have ever bought or considered buying a multi-channel potentiostat, you have probably realized it is more complex than it first seems: modules, chassis, fixed channels, sequential measurements…

And to make things worse, different manufacturers often use different terminology, or simply focus on their own solutions. The result is the same: you end up confused, without fully understanding the real differences.

And it is true, each manufacturer has its own design choices and technical nuances that may fit your needs better or worse. In this article, we focus on system architecture and how the channels are actually implemented. Understanding this will help you identify what you really need and save you a significant amount of time.

In the following sections, we explain each architecture in detail. If you prefer a quick overview, you can also refer to the schematic below comparing all of them.

Types of multi-channel potentiostats

1. Integrated / single-box

The easiest to understand.

It is a single unit (one chassis) that already includes multiple channels inside. You cannot modify it: you buy it as it is, with a fixed number of channels.

Each channel is usually independent, but generally all of them have the same specifications (same current range, same EIS capability, etc.).

A simple way to think about it: it is like having several potentiostats inside one box, all running in parallel and controlled through a single software.

2. Modular / chassis-based

Here you also have a box (chassis), but instead of coming fully assembled, you configure it yourself.

Inside the chassis there are slots, and in each one you install a module. That module can be a basic channel, a channel with EIS, a low-current optimized channel, a booster, etc.

In other words, not all channels need to be identical. A simple way to think about it: it is like a Lego system where you build your potentiostat according to your needs.

The full system behaves as a single instrument, controlled from one software.

3. Stackable / multi-unit

Here the concept changes completely.

Instead of a single box, you have multiple independent potentiostats connected to the same PC.

A simple way to think about it: it is like buying several standalone potentiostats and making them work together. You can add units whenever you want, mix different specifications, disconnect and use one independently, etc.

Main advantage: you are not limited by chassis size. However, the drawbacks (depending on the manufacturer) are more cables, more complex setup, possible noise or grounding issues, synchronization is not always perfect, and many others that needs to be asked to the manufacturer.

4. Multiplexed (pseudo-multichannel)

This is fundamentally different.

You have one real potentiostat and multiple connections. The system switches between them automatically: electrode 1 → electrode 2 → electrode 3…

So it does not measure simultaneously, but sequentially. A simple way to think about it: the instrument “visits” each cell one by one.

This is extremely useful for high-throughput screening, but it is not suitable when strict simultaneity is required.

Final note (important)

This article is a simplified, practical overview.

The field is more complex. There are hybrid architectures, custom implementations, and edge cases that do not fit perfectly into these categories.

There are also critical aspects that vary depending on the specific case, such as grounding vs floating, galvanic isolation, crosstalk, or whether EIS can be performed in parallel even in “true” multi-channel systems.

All of this ultimately depends on the manufacturer and system design.

However, this framework works well in most situations.

Looking for a potentiostat? You can explore low-current systems (≤100 mA) here, or mid and high-current systems (>100 mA) here.

If you are not sure which one fits your application, feel free to reach out. We will help you find the right solution, free of charge.

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