Hierarchical Graphitic Carbon Nitride–Zeolitic Imidazolate Framework-67 Nanostructures Adorned on Calcium Molybdate Nanospheres for High-Performance Supercapacitor Applications

Abstract

Complex composite nanomaterials have recently received attention because of their enhanced electrochemical performance compared to single-structured materials. In this study, we synthesized calcium molybdate (CaMoO4) particles with a spherical shape and conducted surface modification to fabricate composite heterostructures on the CaMoO4 backbone using a simple two-step hydrothermal technique. To test their electrochemical characteristics, the produced hierarchical heterostructures were used as an electrode material for supercapacitors, exhibiting a cycling efficiency of 94% after 5000 cycles, a specific capacitance of 586 C g–1 at a current density of 1 A g–1, and good reversibility. These results demonstrate that the development of hierarchical heterostructures can significantly improve the electrochemical properties of materials by creating well-defined interfaces, increasing the surface area, and promoting efficient charge transfer, making them highly attractive for various applications in the field of energy storage and conversion.

Tetrahedrally Structured CaMoO4 Nanospheres on Heteroatom-Doped Carbon Nanotubes for Sensitive Food Additive Electrochemical Sensors

“…Consequently, it is capable of being an important contribution to a broad range of applications, including catalysis, photoluminescence, humidity sensors, electrochemical sensors, supercapacitors, scintillator materials, and photocatalysis. − Calcium molybdate (CaMoO 4 ) is among the most significant functional materials owing to its intrinsic properties. It is widely used for light-emitting diodes, sensors, detectors, catalysis, energy storage applications, Li-ion batteries, fluorescent lamps, photoluminescence, nanopigment, etc. − In addition to having a stable scheelite structure and excellent physical and chemical properties, CaMoO 4 exhibits special stability because it contains four or eight oxygen atoms at its core . The tetrahedron MoO 4 unit of CaMoO 4 is highly chemically stable and exhibits an intense charge transfer band .…”