Heteroepitaxial metal-organic frameworks derived cobalt and nitrogen codoped carbon nanosheets to boost oxygen reduction

The rational design and facile construction of hybrid metal–organic framework (MOF) with hierarchical nanostructures can motivate novel multifunctional platforms to attain desirable performance. In this work, a new series MOF-on-MOF heterostructures, including ZIF-8/Zinc(II)-hexamethylenetetramine (ZIF-8/Zn-HMT) ZIF-8 + ZIF-67/Zn-HMT-X (ZIF/Zn-HMT-X), be conveniently synthesized by heteroepitaxial growth. as-obtained carbon nanosheets CoZnNC-X are calcined from CoZn precursor, they have abundant N-doping, dispersive Co particles, conductive network large specific surface area, exhibiting efficient oxygen reduction reaction (ORR) as well Zn-air battery (ZAB) Among them, the most optimal CoZnNC-2 shows an onset potential 0.95 V, high diffusion-limited current density 5.41 mA cm?2, small Tafel slope 59.1 mV dec?1 excellent stability. Furthermore, as-assembled ZAB based on reveals power 113 mW cm?2 capacity 713.5 mAh g?1. Hence, demonstrated work paves brand-new route rationally regulate MOF-derived nanomaterials electrocatalysts for energy conversion storage applications.