Hard-Magnet L10-CoPt Nanoparticles Advance Fuel Cell Catalysis

？ Hard-magnet tetragonal L1 0-CoPt nanoparticles with 2–3 atomic layers of Pt shell ？ Effectively stabilized Co by L1 0 structure to enhance Pt catalysis ？ Mass activity of 0.56 A/mg Pt at 80°C in the membrane assembly electrode ？ Meeting 2020 DOE target of both activity and stabilit