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Hierarchical porous NiCo2O4/CeO2 hybrid materials are successfully synthesized via a simple solvothermal method and subsequent heat treatment and exhibit remarkable electrochemical performances in supercapacitors.

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Lanthanide(III) (Eu and Tb)-imidazoledicarboxylic acid complexes were immobilized on colloidal mesoporous silica with diameter smaller than 100 nm by covalent bond grafting technique and uniform and monodisperse luminescent Eu-idc-Si and Tb-bidc-Si functionalized mesoporous silica hybrid nanomaterials (MSNs) were obtained. The lanthanide(III) complexes-functionalized MSNs were characterized by fluorescence spectra, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption−desorption, and powder X-ray diffraction. The hybrid nanomaterials Eu-idc-Si and Tb-bidc-Si functionalized MSNs show strong red and green photoluminescence upon irradiation with ultraviolet light, respectively. Both hybrid nanomaterials exhibit long lifetimes. The mesoporous silica nanoparticles are stable colloid and may have some advantages for potential applications in drug delivery or optical imaging.

Binary metal oxides have recently attracted extensive attention from researchers in the energy storage and conversion field due to their high energy densities and multiple oxidation states. Novel 3D CoVO porous rose-like structures and 2D NiCoVO nanoplates were facilely synthesized via a solvothermal method, and the morphologies, Ni/Co ratios, and surface area of these samples can be easily tuned in the same procedure. The as-prepared CoVO porous rose-like structure exhibited good electrocatalytic oxygen evolution performance with excellent activity and stability. In addition, 2D NiCoVO nanoplates delivered a high specific capacitance of 1098.9 F g at 4 A g and good cycling stability (remaining 68% after 7000 cycles) in aqueous KOH electrolyte. The NiCoVO nanoplates inherit the pseudocapacitive benefits of both NiVO and CoVO, showing a higher specific capacitance than pure CoVO porous rose-like structures.

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