Nitrogen and fluorine hybridization state tuning in honeycomb-like car

Nitrogen and fluorine hybridization state tuning in hierarchical honeycomb-like carbon nanofibers for optimized electrocatalytic ORR in alkaline and acidic electrolyteshttps://www.wyactivatedcarbon.com/
Nitrogen and fluorine co-doped hierarchical honeycomb-like carbon nanofibers (Nsingle bondF-CNFs-950) are prepared by electro-blown spinning technology and high temperature calcination. It possesses large specific surface area, micro/meso/macro hierarchical through-pore structure, high pyridine-N and graphite-N content. These characteristics make it exhibit an outstanding alkaline electrocatalytic oxygen reduction reaction (ORR) activity (half wave potential of 0.833V vs reversible hydrogen electrode and current density of 5.48mAcm−2). In particular, the introduction of the ionic Csingle bondF/Nsingle bondF successfully avoids the inactivation of pyridine N in the carbon skeleton due to protonation in the acidic electrolyte.honeycomb active carbon And the ionic Csingle bondF/Nsingle bondF activated pyridine N work synergistically with graphite N to promote Nsingle bondF-CNFs-950 to exhibit an acidic ORR activity (half wave potential of 0.606V vs reversible hydrogen electrode and current density of 5.58mAcm−2) that is only second to commercial Pt/C. Importantly, the Nsingle bondF-CNFs-950 catalyst exhibits much better methanol tolerance and electrochemical stability in both alkaline and acidic environments.