Fe, P, N, S multidoping porous graphene material as a Bifunctional OER/ORR electrocatalytic activity for enhancing rechargeable Zn-air batteries

Oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalyst activity may be regarded as a crucial indicator of expected performance in metal-air batteries, which are limited by the inadequate electrochemical activity and low conductivity of accessible materials. This disadvantage can be solved by the development of hierarchically structured three-dimensional (3D) carbon. Through carbonization method, we synthesize the bifunctional catalysts, Fe, P, N, and S multidoped porous graphene (FePNS-G) for use in rechargeable Zn–air batteries (ZABs). FePNS-G-2 indicates superior active site density for both the OER and ORR. Moreover, the FePNS-G-2 exhibits excellent long-term electrochemical stability for 10 h in both the OER and ORR. ZABs assembled for FePNS-G-2 shows a higher power density (168.3 mW cm−2) and a higher specific capacity (782.36 mA h g−1) than benchmark Pt/C + IrO2 electrocatalyst. The sturdy durability of FePNS-G-2 for OER and ORR leads to the charge–discharge cycle durability. The excellent electrocatalytic activity and steady cycling life of FePNS-G-2 examines the air cathode as an electrocatalyst in feasible ZAB applications.