Multi-layered active sites attached in 1D/3D hierarchical conductive network promote dioxygen fragmentation

Via the unique free radical polymerization induced hemin coated on PPy nanotubes as the first active site, and the double propionic groups of hemin served as an adsorption site and bound strongly to Co2+, inducing the growth of ZIF-67 with the second active site. Multi-layered active sites catalyst shows potential application for ORR.