Among the different approaches to water electrolysis, proton exchange membrane (PEM) electrolysis stands out for its ability to respond quickly to changes in electricity supply. This flexibility makes it particularly well suited for use with renewable energy sources such as wind and solar power.

However, this technology relies on iridium-based catalysts for oxygen production, which are not only expensive due to the metal's rarity but can also gradually lose their effectiveness over time.

To help iridium catalysts last longer, researchers developed a new design to protect the metal from degradation. By embedding iridium nanoparticles in a specially designed high-entropy perovskite, they created a structure that firmly holds the particles in place while regulating their electronic environment.