Co3O4 Nanoparticles Supported on N-doped Electrospinning Carbon Nanofibers as an Efficient and Bifunctional Oxygen Electrocatalyst for Rechargeable Zn-Air Batteries
The composite materials made up of non-precious metal oxide and N-doped carbon materials are great potential bifunctional catalysts toward Zn-air battery (ZABs) owing to the synergistic effect caused by two components. Herein, a kind of Co3O4 nanoparticles supported by N-doped electrospinning carbon nanofibers (CNFs) with superior bifunctional activity for ORR & OER and remarkable electrocatalytic stability in alkaline electrolyte is designed and synthesized. In addition, the hybrid electrocatalyst further promotes the rechargeable ZABs with low overpotential, high efficiency as well as prolonged cycling life, that is superior to precious metal catalyst of Pt/C and IrO2. Such remarkably bifunctional catalytic activity is attributed to the enhanced charge transfer capability, abundant exposed catalytically active sites and the synergistic effect among Co3O4 nanoparticles and CNFs. This work should provide a convenient path for the design of non-precious metal and carbon hybrid materials that can employed as efficient electrocatalyst for large-scale implementations of renewable energy conversion devices.