Fabrication of hierarchical flower-like super-structures consisting of porous NiCo2O4nanosheets and their electrochemical and magnetic properties

Abstract

In the present work, we demonstrate a facile and cost-effective strategy for synthesizing hierarchical flower-like super-structures consisting of porous NiCo₂O₄ nanosheets. The morphologies and surface areas of NiCo₂O₄ samples can be tailored by changing the reaction time. The synthesized NiCo₂O₄ samples are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and by using an accelerated surface area and porosimetry analyzer (ASAP 2020M). The NiCo₂O₄ samples exhibit high activity and superior cycling stabilities in ORR. In addition, the magnetic properties of NiCo₂O₄ samples are also studied in detail.