At present, nanostructures with excellent morphology have become a research hotspot. With the deepening of research and the rapid development of nanotechnology, nanosemiconductors have also made remarkable progress. In recent years, ZnWO4 in metal tungstates has been widely used in many fields, which is mainly due to its high crystal density, short radiation length, excellent optical properties, good radiation damage resistance, and non‐liquefaction. Therefore, herein, the synthesis methods and applications of ZnWO4 semiconductor materials in recent years are reviewed. First, the crystal structure and characteristics of ZnWO4 are described, and then the latest research progress of ZnWO4 semiconductor materials is summarized. The synthesis methods and contributions to photocatalysis, sensors, electronic materials, and luminescent materials are highlighted. The characteristics of ZnWO4 nanoarrays and their applications in supercapacitors are particularly emphasized, which provide a reference for the development of multifunctional nanoarrays. Finally, the challenges and countermeasures of ZnWO4 semiconductor materials are summarized and prospected. In a word, a new idea and strategy to design and assemble new types of ZnWO4 nanomaterials with multiconstructional systems and multifunctional properties for their practical applications is provided.
At present, supercapacitors have become efficient electrochemical energy storage devices. Electrode materials and electrolyte concentration are important factors affecting the electrochemical performance of supercapacitors. Among the transition metal oxide electrode materials, ZnWO4 has become a promising electrode material for supercapacitors due to its excellent electrochemical performance, but it is still limited by its low energy density. Therefore, the design and development of electrode materials with special structures and the exploration of appropriate electrolyte concentrations have important practical significance for improving the electrochemical performance of ZnWO4‐based supercapacitors. Herein, ZnWO4 nanomaterials with a nanosheets array structure are prepared by a hydrothermal method, and the effect of different KOH electrolyte concentrations on their electrochemical properties is explored for the first time. It is found that when KOH is 6 M, ZnWO4 nanosheets array has the highest specific capacitance (660.72 F g−1 at 1 A g−1) and energy density of 99.93 Wh g−1 (ΔV:0–0.55 V). In this article, the influence of different electrolyte concentrations on the electrochemical properties is revealed and the mechanism is clarified, which provides a reference for the further development of ZnWO4 nanomaterials.
It is very important to develop novel nanocomposites as electrode materials for supercapacitors (SCs). MoSe2 porous nanospheres were prepared by one-step hydrothermal method, and polyaniline (PANI) nanosheets were grown in-situ to obtain MoSe2/PANI capsule nanospheres (CNs). By changing the amount of aniline, it was found that MoSe2/PANI-16 CNs had the best electrochemical performance, and a high specific capacitance of 753.2 F/g was obtained at a current density of 1 A/g. In addition, the interface electron transport path was clarified that a C-Mo-Se bridge bond may be formed for rapid electron transfer. The reaction kinetics was also explored. The large specific surface area of MoSe2/PANI CNs provided more reactive sites, so that the contribution of pseudocapacitance was much larger than diffusion capacitance. The assembled MoSe2/PANI//activated carbon asymmetric supercapacitor has a energy density of 20.1 Wh/kg at a power density of 650 W/kg. These results indicate that the MoSe2/PANI CNs are a promising electrode material.
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