Laser-induced graphene synthesis of Co3O4 in graphene for oxygen electrocatalysis and metal-air batteries

We present here a straightforward synthesis of highly efficient bifunctional OER/ORR catalysts through a facile laser-induced graphene (LIG) process to produce Co3O4/LIG. The Co3O4/LIG showed OER and ORR activity comparable to noble metal-based catalysts in alkaline electrolyte. Furthermore, the Co3O4 /LIG exhibited promising performance in Zn-air and Li-0 2 batteries. The rechargeable Zn-air battery has an open-circuit potential of 1.46 V and a high power density of 84.2 mW/cm(2) at 100 mA/cm(2). The Li-O-2 battery with the Co3O4/LIG cathode exhibits low overpotentials in both charge and discharge processes and excellent cycling stability up to 242 cycles. (C) 2018 Elsevier Ltd. All rights reserved.