Fe doping intensifies the built-in electric field for tailoring the reconstruction of sulfides towards efficient oxygen evolution.

Summary: Scientists are working hard to make better materials to help produce oxygen, which is super important for clean energy. For a long time, experts thought a material called "sulfide" stayed exactly the same during this process. Because of this old idea, it was hard to make better tools. But in this new study, researchers learned that the material actually changes! By adding a tiny bit of iron to a nickel-sulfide mix, they created a stronger invisible electric field inside it. This electric field helps the material rebuild itself perfectly, making it much faster and better at producing oxygen.