Petal-like CoMoO4 Clusters Grown on Carbon Cloth as a Binder-Free Electrode for Supercapacitor Application

Polylactic acid-based plastic activated NiAl2O4 nanoparticles as highly active positive electrode materials for energy storage supercapacitor

A simple, low-cost, and environmentally benign process for synthesizing nanostructured NiO/NiAl2O4 on multiple kinds of carbon nanostructures (CNS) is presented. This method develops polylactic acid (PLA) based waste plastic materials for the producing CNS. These composites (NiO@NiAl2O4/CNS) were examined as potential electrodes in supercapacitors (SC) as they exhibit good charge/discharge reversibility and provide adequate specific capacitance values with a maximum being 1984 F/g at 0.5 A g-1. It is noteworthy that the cycling stability of this sample at 10 A g-1 maintained 101.7% of its initial capacity even after 5000 GCD cycles. An asymmetric supercapacitor (ASC) was built and analyzed, with NiO@NiAl2O4/CNS serving as the cathode and activated carbon serving as the anode of the device. The concluded device has an energy density of 58 Wh kg-1 with a power density of 986 W kg-1 and a SCs of 216.5 F/g. The results showed that the materials mentioned are a great option to use as electrode materials in applications involving the storage of energy.

Preparation of the N, P-Codoped Carbonized UiO-66 Nanocomposite and Its Application in Supercapacitors

Preparing high-performance electrode materials from metal-organic framework precursors is currently a hot research topic in the field of energy storage materials. Improving the conductivity of such electrode materials and further increasing their specific capacitance are key issues that must be addressed. In this work, we prepared phosphoric acid-functionalized UiO-66 material as a precursor for carbonization, and after carbonization, it was combined with activated carbon to obtain nitrogen-/phosphorus-codoped carbonized UiO-66 composite material (N/P-C-UiO-66@AC). This material exhibits excellent conductivity. In addition, the carbonized product ZrO2 and the nitrogen-/phosphorus-codoped structure evidently improve the pseudocapacitance of the material. Electrochemical test results show that the material has a good electrochemical performance. The specific capacitance of the supercapacitor made from this material at 1.0 A/g is 140 F/g. After 5000 charge-discharge cycles at 10 A/g, its specific capacitance still remains at 88.5%, indicating that the composite material has good cycling stability. The symmetric supercapacitor assembled with this electrode material also has a high energy density of 11.0 W h/kg and a power density of 600 W/kg.

Performance comparison of distinct bismuth molybdate single phases for asymmetric supercapacitor applications

The enticing features of metal molybdates make them an attractive candidate for energy storage systems. This report describes the synthesis of three distinct single-phase bismuth molybdates (Bi₂Mo_xO_y; α-Bi₂Mo₃O₁₂, β-Bi₂Mo₂O₉, and γ-Bi₂MoO₆) using the gel matrix particle growth method and their application in high-performance asymmetric supercapacitors. The single phase and purity of the synthesized Bi₂Mo_xO_y particles were confirmed by X-ray diffraction (XRD) and further verified by Raman analysis. The UV-visible spectra show the electronic and optical behaviours of the as-synthesized α, β, and γ Bi₂Mo_xO_y. The morphologies of the as-synthesized three different Bi₂Mo_xO_y phases were analysed using scanning electron microscopy (SEM). The particle formation was further investigated by transmission electron microscopy (TEM), and the interplanar spacings of the Bi₂Mo_xO_y phases were in accordance with the planes. The surface area and pore volume of the prepared samples were analysed using Brunauer-Emmett-Teller (BET) analysis. The electrochemical properties of the products were confirmed by various tests, including cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS) in 3 M KOH. Among the three phases, α-Bi₂Mo₃O₁₂ exhibits a huge specific capacitance (Cs) of 714 F g^-1 at a current density of 1 A g^-1. Furthermore, it displays an admirable cycling stability of 86.55% after 5000 cycles. The chosen α-Bi₂Mo₃O₁₂ electrode possesses an increased energy density of 47.5 W h kg^-1 at 1 A g^-1 with a capacitive retention rate of 71.90% at 5 A g^-1 after 10 000 cycles. A remarkable electrochemical performance of Bi₂Mo₃O₁₂ with an exceptional power density of 750 W kg^-1 was observed for the prepared asymmetric device. Bismuth molybdate's notable performance indicates that it can be an active material for energy storage applications.

CuCoNi–S anchored CoMoO4/MoO3 forming core–shell structure for high-performance asymmetric supercapacitors

CoMoO4/MoO3@CuCoNi–S is prepared by hydrothermal and electrodeposition methods. It offers promising supercapacitor properties.