Building Stronger Fuel Cells with Tiny Platinum‑Cobalt Tubes

Scientists have found a way to make the tiny particles that help fuel cells work better. Instead of mixing the metals together, they grow a thin layer of platinum on tiny cobalt tubes that already have holes in them. This “seeded growth” technique creates a one‑dimensional structure that looks like a shell wrapped around the tube. When these platinum‑cobalt tubes are used in fuel cells, they react with oxygen more efficiently. The holes let gases flow through easily, and the platinum surface becomes slightly squeezed after the cell runs for a while. That squeezing changes how oxygen molecules stick to the surface, making the reaction faster.The squeezed platinum also becomes harder to wear out. Because the atoms on the surface are under strain, it takes more energy for them to leave their spots. This means the tubes keep working well even after many cycles of charging and discharging. Researchers think this method could be a new trick for designing better catalysts. By carefully controlling how the platinum layer grows, they can tweak the surface to get more power and longer life for fuel cells. The new design shows that tiny changes in how atoms are arranged can have a big impact on energy technology.