Beschreibung:
In this work, a three-dimensional (3D) structural material in which conductive metal-organic frameworks (Co-CAT) decorated on NiFe layered double hydroxide (NiFe-LDH) nanosheets are embedded at the top of carbon nanofibers (Co-CAT/NiFe-LDH/CNFs) is prepared via eletrospinning calcination and two-step hydrothermal synthesis. The catalyst displays excellent electrocatalytic activity toward the oxygen evolution reaction with low overpotential of 330 mV which is excellent than the commercial Pt/C. Density functional theory (DFT) calculation demonstrates that the high conductivity of the Co-CAT/NiFe-LDH/CNFs accelerates the electron transfer, thus improving the catalytic performance. Therefore, when the electrochemical properties are further assessed, Zn-air batteries built using the Co-CAT/NiFe-LDH/CNFs shows a high cycling stability for 56 h as well as a high-power density of 327.09 mW cm−2. Furthermore, when employed as an air cathode in solid-state Zn-air batteries, a peak power density of 112.04 mW cm−2 is provided and the cycling stability is outstanding for 11.5 h. This work delegates a stout step toward exploration of hydrotalcite catalysts and offers new insights into OER