Alkaline Electrolyzer Stack vs. PEM Electrolyzer Stack: Which One is more suitable for Your Hydrogen Production?

In the field of hydrogen production, choosing the right electrolyzer stack is crucial. Currently, the two most popular types of stacks are the Alkaline Electrolyzer stack and the PEM Electrolyzer stack. But which one is better suited to your needs? Let’s dive deeper to help you make an informed decision.

1. What is an Alkaline Electrolyzer Stack?

An ALK Electrolyzer stack uses an lye solution, typically potassium hydroxide (KOH), as the electrolyte. This technology has been around for decades and is known for its reliability and cost-effectiveness. Due to its lower operational costs and longer lifespan, alkaline electrolyzer stacks are well-suited for large-scale hydrogen production.

2. What is a PEM Electrolyzer Stack?

A PEM Electrolyzer Stack(Proton Exchange Membrane) uses a solid polymer electrolyte. This type of stack is more compact and can operate at higher current densities, making it suitable for applications where space is limited. PEM electrolyzer stacks can better adapt to variable power inputs, making them ideal for use in conjunction with renewable energy sources such as wind and solar.

3. Conclusion

The choice between alkaline electrolyzer stack or PEM electrolyzer stack depends on your specific needs for hydrogen production.

ALK electrolyzer stack: suitable for low-cost, large-scale, and low water quality requirements scenarios, such as industrial by-product hydrogen and power grid peak shaving.

PEM electrolyzer stack: suitable for scenarios with high purity, fast response, and limited space, such as hydrogen refueling stations and vehicle mounted hydrogen production.

By understanding the advantages and disadvantages of each electrolyzer stack, you can optimize the hydrogen production process and achieve sustainable development goals more efficiently.