Nitrogen‐Doped Graphene/Carbon Nanotube Hybrids: In Situ Formation on Bifunctional Catalysts and Their Superior Electrocatalytic Activity for Oxygen Evolution/Reduction Reaction

There is a growing interest in oxygen electrode catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as they play a key role in a wide range of renewable energy technologies such as fuel cells, metal‐air batteries, and water splitting. Nevertheless, the development of highly‐active bifunctional catalysts at low cost for both ORR and OER still remains a huge challenge. Herein, we report a new N‐doped graphene/single‐walled carbon nanotube (SWCNT) hybrid (NGSH) material as an efficient noble‐metal‐free bifunctional electrocatalyst for both ORR and OER. NGSHs were fabricated by in situ doping during chemical vapor deposition growth on layered double hydroxide derived bifunctional…