Zinc oxide (ZnO) is an adaptable material that has distinctive properties, such as high-sensitivity, large specific area, non-toxicity, good compatibility and a high isoelectric point, which favours it to be considered with a few exceptions. It is the most desirable group of nanostructure as far as both structure and properties. The unique and tuneable properties of nanostructured ZnO shows excellent stability in chemically as well as thermally stable n-type semiconducting material with wide applications such as in luminescent material, supercapacitors, battery, solar cells, photocatalysis, biosensors, biomedical and biological applications in the form of bulk crystal, thin film and pellets. The nanosized materials exhibit higher dissolution rates as well as higher solubility when compared to the bulk materials. This review significantly focused on the current improvement in ZnO-based nanomaterials/composites/doped materials for the application in the field of energy storage and conversion devices and biological applications. Special deliberation has been paid on supercapacitors, Li-ion batteries, dye-sensitized solar cells, photocatalysis, biosensors, biomedical and biological applications. Finally, the benefits of ZnO-based materials for the utilizations in the field of energy and biological sciences are moreover consistently analysed.

https://iopscience.iop.org/article/10.1088/1361-6528/ab268a/pdf

A review on ZnO nanostructured materials: energy, environmental and biological applications.

One pot hydrothermal growth of hierarchical nanostructured Ni3S2 on Ni foam for supercapacitor application

Synthesis, decoration and properties of three-dimensional graphene-based macrostructures: A review

Synthesis, optimization and applications of ZnO/polymer nanocomposites.

Fruit peel extract mediated green synthesis of zinc oxide nanoparticles

In this paper, we report a facile low-cost synthesis of the graphene-ZnO hybrid nanocomposites for solid-state supercapacitors. Structural analysis revealed a homogeneous distribution of ZnO nanorods that are inserted in graphene nanosheets, forming a sandwiched architecture. The material exhibited a high specific capacitance of 156 F g−1 at a scan rate of 5 mV.s−1. The fabricated solid-state supercapacitor device using these graphene-ZnO hybrid nanocomposites exhibits good supercapacitive performance and long-term cycle stability. The improved supercapacitance property of these materials could be ascribed to the increased conductivity of ZnO and better utilization of graphene. These results demonstrate the potential of the graphene-ZnO hybrid nanocomposites as an electrode in high-performance supercapacitors.

/pdf/high-performance-solid-state-supercapacitors-based-on-101ymqqv31.pdf

High-performance solid-state supercapacitors based on graphene-ZnO hybrid nanocomposites

3D (Three-dimensional) sandwich-structured of ZnO (zinc oxide)/rGO (reduced graphene oxide)/ZnO for high performance supercapacitors

Binder free synthesis of MnO2 nanoplates/graphene composites with enhanced supercapacitive properties

We report a novel thermal reduction process to obtain freestanding 3D mesoporous graphene with excellent electrical conductivity for supercapacitor electrode applications in the presence of a CO atmosphere. The introduction of CO can not only effectively reduce and repair graphene oxide (GO) with fewer defects, but also activate graphene with highly mesoporous nanostructures. The CO-activated thermal graphene oxide (CRGO) exhibits enhanced specific capacitance of 291 Fg−1 at a current density of 1 Ag−1, high rate capability, and excellent cycle performance compared to conventional thermal reduced GO. The method demonstrated that the help of CO is an efficient method for the improvement of the supercapacitive performance of thermally reduced graphene oxide.

Freestanding 3D mesoporous graphene oxide for high performance energy storage applications

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High-performance solid-state supercapacitors based on graphene-ZnO hybrid nanocomposites

3D (Three-dimensional) sandwich-structured of ZnO (zinc oxide)/rGO (reduced graphene oxide)/ZnO for high performance supercapacitors

Binder free synthesis of MnO2 nanoplates/graphene composites with enhanced supercapacitive properties

Freestanding 3D mesoporous graphene oxide for high performance energy storage applications