Abstract
AbstractDeveloping bifunctional electrocatalysts with high activity toward the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is of great significance for metal–air batteries. Herein, a covalent organic framework (COF)‐derived bifunctional electrocatalyst toward the ORR and the OER is demonstrated, in which the COF‐derived carbon on carbon nanotubes is used as the support to anchor active bimetal Ni/Fe clusters and nanoparticles. Since Ni/Fe ions are immobilized in the pore channels of the COFs, the aggregation and migration of ions under pyrolysis are effectively hindered. In addition, the COF‐derived carbon‐made catalyst features abundant nitrogen content and a high mesoporous volume. As a result, the catalyst displays ultrahigh ORR activity, with a half‐wave potential of 0.87 V versus reversible hydrogen electrode in 0.1 m KOH electrolyte. Moreover, the catalyst achieves a low operating potential of 1.55 V at a current density of 10 mA cm−2, with a Tafel slop of 61 mV decade−1 for OER in 0.1 m KOH, superior to most oxygen electrocatalysts. Furthermore, the catalyst also exhibits remarkable performance in Zn–air batteries. This work demonstrates a new insight into developing bifunctional catalysts from COFs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.