Electrospinning Device for Nanofibers| Constructing Stable Bifunctional Electrocatalyst ofCo-CozNbsO14 with Reversible Interface Reconstitution Abilityfor Sustainable Zn-Air Batteries

Adv. Sci. (IF 14.3): Co─Co2Nb5O14 Bifunctional Electrocatalyst for Sustainable Zn-Air Batteries

Challenge: Transition metal and metal oxide heterojunctions as bifunctional oxygen reduction/evolution reaction (ORR/OER) electrocatalysts for Zn-Air batteries have been extensively studied, but the dynamic changes at the interfaces between transition metal oxides during catalysis remain unclear.

Approach: Professor Yan Jianhua from Donghua University prepared flexible Co─Co2Nb5O14-x@PCNF films via sol-gel electrospinning, followed by pre-oxidation and carbonization in H2/Ar atmosphere, developing a Co─Co2Nb5O14 bifunctional electrocatalyst.

Innovation 1: The SMSI interface promotes dynamic electron transfer between Co/Co2Nb5O14, and the reversible Nb4+/Nb5+ active sites enable bidirectional adsorption/migration of intermediates, achieving dynamic reversible interface reconstruction.

Innovation 2: The electrocatalyst exhibits a high ORR half-wave potential of 0.84 V, low OER overpotential of 296.3 mV, and excellent cycling stability over 30000 s. The ZAB demonstrates a high capacity of 850.6 mA h·gZn−1 and stable operation for 2050 cycles at 10 mA·cm-2.

DOI: https://doi.org/10.1002/advs.202413796