Electrochemical growth of octahedral Fe3O4 with high activity and stability toward the oxygen reduction reaction

Octahedral Fe3O4 crystals were prepared by a facile potentiostatic deposition approach. The as-prepared Fe3O4 exhibits high electro-catalytic activity toward the oxygen reduction reaction (ORR) and excellent stability. The unique octahedral structure provides a high density of active sites and facilitates the ORR via a dominant pathway of oxygen reduction to hydroxide.