Kindly clarify about conductive substrates for AEM water electrolyzers. Which one is better? Ni mesh or stainless steel mesh?

Sasikala Seetharaman @Sasikala-Seetharaman

09 April 2024 1 7K Report

Kindly clarify about conductive substrates for AEM water electrolyzers. Which one is better? Ni mesh or stainless steel?

Kristaq Hazizi

The choice between nickel (Ni) mesh and stainless steel mesh as conductive substrates for anion exchange membrane (AEM) water electrolyzers depends on various factors including cost, corrosion resistance, conductivity, and compatibility with the electrolyzer's operating conditions. Here's a comparison between the two:

Corrosion Resistance:Stainless steel is generally more corrosion-resistant compared to nickel. It is less likely to corrode or degrade when exposed to electrolyte solutions, especially in alkaline environments typical of AEM electrolyzers. Nickel mesh may corrode over time in alkaline electrolytes, potentially leading to degradation of performance and durability of the electrolyzer.

Conductivity:Nickel typically has higher electrical conductivity compared to stainless steel. This higher conductivity can lead to better electron transfer efficiency within the electrode, potentially improving overall electrolyzer performance. However, the difference in conductivity may not be significant in practical applications, especially considering the relatively low conductivity requirements for AEM electrolyzers compared to proton exchange membrane (PEM) electrolyzers.

Cost:Stainless steel mesh is generally more cost-effective compared to nickel mesh. This can be an important factor, especially for large-scale electrolyzer manufacturing or deployment. Nickel mesh tends to be more expensive due to the higher cost of nickel compared to stainless steel.

Compatibility:Both nickel and stainless steel meshes are compatible with AEM electrolyzers, but stainless steel may offer better long-term stability and compatibility with alkaline electrolytes. Stainless steel meshes are commonly used in various electrochemical applications and have a proven track record of performance and durability.

Other Considerations:Mechanical properties: Stainless steel meshes may have better mechanical strength and resilience compared to nickel meshes, which can be advantageous in terms of handling and durability. Surface characteristics: The surface properties of the substrate can influence catalyst adhesion and electrode performance. Both nickel and stainless steel meshes can be surface-treated or coated to enhance catalytic activity and durability.

In summary, both nickel and stainless steel meshes can be used as conductive substrates for AEM water electrolyzers, but stainless steel may offer advantages in terms of corrosion resistance, cost, and long-term stability. However, the choice ultimately depends on specific application requirements, cost considerations, and performance priorities.

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