Rational design of marigold shape composite Ni3V2O8 flower: a promising catalyst for oxygen evolution reaction
Advancement of double spinel-type blended metal oxide and designing assorted shaped heterostructured nanomaterials of two different metals in course of action remains a wild zone of research. In this work, we designed marigold flower shaped Ni3V2O8 structure by a basic and effortless thermal decay of Ni(II) 8-hydroxyquinoline and VO(II) 8-hydroxyquinoline molecular precursor using universal and green solvent, water. The marigold flower shaped structure of Ni3V2O8 was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field-emission scanning electron microscopy (FE-SEM) and Transmission electron microscopy (TEM). Finally, we have tested these marigold flower shaped Ni3V2O8 structure for electrochemical performance, such as Oxygen Evolution Reaction (OER). The results demonstrated that marigold flower shaped Ni3V2O8 structure has superior catalytic activity (overpotential 328 mV at 10 mA cm−2 and Tafel slope of 61 mV dec−1) compared with physical mixture of V2O5 and NiO(overpotential 496 mV at 10 mA cm−2 and Tafel slope of 158 mV dec−1 ), pure NiO (overpotential 553 mV at 10 mA cm−2 and Tafel slope of 205 mV dec−1) or V2O5 (overpotential 668 mV at 10 mAcm−2 and Tafel slope of 314 mV dec−1) in alkaline medium. This higher OER activity of marigold flower shaped Ni3V2O8 structure strengthens its adoption as a potential candidate in the field of energy storage and conversion systems.