Corrigendum to: Facile synthesis and characterization of zinc molybdate (ZnMoO 4 ) nanosheets for electrochemical supercapacitor application

This study explores the synthesis and characterization of zinc molybdate (ZnMoO4) nanosheets with emphasis on their potential application for energy storage devices particularly supercapacitors. The synthesis of ZnMoO4 nanosheets was done through co-precipitation followed by examination of their structure, morphology, optical, thermal behaviour and electrochemical performance by various characterization techniques. X-ray diffraction (XRD) analysis confirmed that the formation of monoclinic ZnMoO4 phase with the average crystallite size 17.93 nm. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) revealed that this material had nanosheets-like structure which helps to increase ion transport and surface area; these two factors are essential for enhancing the material’s supercapacitor efficacy. The semiconductor characteristics were determined using UV–Visible diffuse reflectance spectroscopy (UV-DRS) which indicated a band gap energy of 4.2 eV. Fourier transform infrared (FTIR) analysis confirmed that the presence of Zn–O and Mo–O bonds in their crystal lattice. Thermogravimetric analysis (TGA) showed that the ZnMoO4 nanosheets had thermal stability since they experienced only a slight mass loss of 2.57 % up to 800 °C. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests were undertaken to find out the specific capacitance and the value is 618 F g⁻1 at a current density of 1 A g⁻1.

Mn doped NiO nanostructured materials with composition Ni1-xMnxO1-δ (where x = 0.01, 0.03, 0.05, 0.07, 0.09) (MNO) were prepared by simple facile chemical synthesis route. The structural, particulate and microstructural characteristics of the Mn-doped NiO nanostructures were studied by studied by XRD, FTIR, particle size analysis, EDAX, SEM and HRTEM techniques. The XRD peaks of all the materials were indexed to the face-centred cubic (FCC) crystalline structure. FTIR spectra revealed the presence of NiO bending vibration mode between 432.07 to 492.83 cm-1. Particle size patterns and SEM photographs confirmed the presence of nanosized grains apart from few bigger sized grains. The diameter of grains was mostly found to be in the range of 30.04 to 591.16 nm. Presence of appropriate composition of elements was confirmed by EDAX data. Polycrystalline behaviour of Ni0.95Mn0.05O1-δ was exhibited by HRTEM data. The electrochemical phenomena of Ni1-xMnxO1-δ were studied by cyclic voltammetry (CV), galvanostatic charge – discharge and electrochemical impedance measurements in 6 M KOH aqueous solution. Among the samples studied, Ni0.95Mn0.05O1-δ electrode exhibited maximum specific capacitance of 369.6 Fg-1 at a current density of 0.5 Ag-1. From the characterization data, Mn-doped NiO nanostructures appear to be the good electrode materials for electrochemical supercapacitor applications.

Synthesis and characterization of bimetallic nickel-cobalt chalcogenides (NiCoSe2, NiCo2S4, and NiCo2O4) for non-enzymatic hydrogen peroxide sensor and energy storage: Electrochemical properties dependence on the metal-to-chalcogen composition

Biomass is the general term for organic substances derived from living organisms (plants and animals). Since, biomass is a renewable, sustainable, innovative, low cost and carbon-neutral energy source, the applications of nano-micro particles produced from biomass in electrochemical applications have emerged. A large number of carbon-based materials, such as featured activated carbon, carbon nanotube, C-dots, biochar, hybrid carbon-metal/metal oxide … etc. can be produced from divergent types of biomass. With the growing energy need in the world, supercapacitors have also developed considerably besides the energy generation and storage methods. The supercapacitor is an energy storage system that can work reversibly to provide high energy in a short time. In these systems, electrode structure and surface properties are crucial for energy capacity enhancement. In this sense, electrode modifications with the above-mentioned biomass-based nano-micro structures are widely used in supercapacitor applications.

Synergistic effect of La2o3 -Nio nanocomposite based electrode for electrochemical high-performance asymmetric supercapacitor applications

In situ one step synthesis of Fe inserted octaethylporphyrin/polyindole: A multifunctional hybrid material with improved electrochemical and electrical properties

More efficient, clean, and renewable energy sources must be developed to replace fossil fuels and protect the environment from their harmful effects. Electrochemical energy storage devices and energy conversion (hydrogen production) sources are two effective approaches for replacing fossil fuels. Herein, single metal tungstates, such as MnWO4 flakes, NiWO4 nanoparticles, and CoWO4 nanoparticles, as well as bimetallic tungstates, such as MnNiWO4, MnCoWO4, and NiCoWO4, were synthesized using a simple hydrothermal method. Furthermore, carbon nanofibers (CNFs) were adopted to modify bimetallic tungstate to improve the electron transfer and extraction of electron–hole pairs. To modify the CNFs with bimetallic tungstate as a composite electrode, a simple and convenient process called the wet impregnation method was employed. The resulting composite materials exhibited better performances in supercapacitor and photoelectrochemical water-splitting studies than those of single and bimetallic tungstates. The hybrid composite, MnNiWO4/CNF, showed a high specific capacity of 1374 F g–1 at a current density of 0.5 A g–1 in a three-electrode configuration, owing to its nonfaradaic and faradaic processes. This performance was 4.2, 10.3, and 3 orders of magnitude higher than those of MnWO4, NiWO4, and MnNiWO4 electrodes, respectively. In photoelectrochemical water-splitting studies, the development of heterostructures decreases electron–hole recombination and improves interfacial charge transfer in composite materials. In this study, the MnNiWO4/CNF nanocomposite material exhibited a maximum applied bias photon-to-current efficiency (ABPE) of 3.47%, approximately 6, 6, and 2 orders of magnitude higher than those of bare MnWO4, NiWO4, and MnNiWO4, respectively, under illumination. The crystallinities, morphologies, absorptions, and chemical compositions of the synthesized materials were investigated using electrochemical and spectroscopic techniques. The results indicate that the synthesized hybrid materials could be promising candidates as electrode materials for remarkable supercapacitor and photoelectrochemical water-splitting applications.

Electrode materials as an important component for the supercapacitors (SC) mainly undertake energy storage. Hence, the research hotspots in the SC fields are focused on the active materials of the electrode. In this study, we have provided a facile synthesis method to prepare reduced graphene oxide (RGO) and cobalt carbonate hydroxide (Co(CO3)0.5(OH)0.11·H2O) nanorod composites. The RGO films were obtained by vacuum filtration of GO papers and hydrothermal method. And during this hydrothermal, Co(CO3)0.5(OH)0.11·H2O nanorods also grow on the surface of RGO films. The as-fabricated RGO/Co(CO3)0.5(OH)0.11·H2O composites are characterized by SEM, EDS, XRD measurement. According to the electrochemical research results, the RGO/Co(CO3)0.5(OH)0.11·H2O electrodes own an ultrahigh volumetric capacitance of 1627 F cm−3 at a current density of 0.5 A g−1. Besides, the energy density of the symmetrical supercapacitor (SSc) assembled with the RGO/Co(CO3)0.5(OH)0.11·H2O electrode material is 9.22 mW h cm−3, and the capacity can be maintained 100.0% after 10,000 cycles when the composite material at the current density of 1 A g−1, these promote an efficient electrode material for electrochemical supercapacitor applications.

Recently, the various porous nano metal oxides used for the electrochemical energy storage supercapacitor applications. Some researchers focus on the binary as well as ternary metal oxides and more metal oxide complex composite materials used for the supercapacitors. In the review article focused on the effect of different metals doped in a nickel oxide nano material on the electrochemical capacitive performance, discussion on methodologies, charge storage mechanism, latest research articles and prepared nanostructures. Nowadays nickel oxide is developing electrode material for storage of charge due to its higher thermal stability, excellent chemical stability, cost effective materials, higher theoretical values of specific capacitance, naturally rich and environment friendliness material. The various metals doped in NiO and their composite oxides have shown good structural stability, reversible capacity, long cycling stability and have been also studied nano structured electrode materials for electrochemical supercapacitor applications.

Highly ordered 1D NiCo2O4 nanorods on graphene: An efficient dual-functional hybrid materials for electrochemical energy conversion and storage applications

MXene has been identified as a new emerging material for various applications including energy storage, electronics, and bio-related due to its wider physicochemical characteristics. Further the formation of hybrid composites of MXene with other materials makes them interesting to utilize in multifunctional applications. The selection of magnetic nanomaterials for the formation of nanocomposite with MXene would be interesting for the utilization of magnetic characteristics along with MXene. However, the selection of the magnetic nanomaterials is important, as the magnetic characteristics of the ferrites vary with the stoichiometric composition of metal ions, particle shape and size. The selection of the electrolyte is also important for electrochemical energy storage applications, as the electrolyte could influence the electrochemical performance. Further, the external magnetic field also could influence the electrochemical performance. This review briefly discusses the synthesis method of MXene, and ferrite magnetic nanoparticles and their composite formation. We also discussed the recent progress made on the MXene/ferrite nanocomposite for potential applications in electrochemical supercapacitor applications. The possibility of magnetic field-assisted supercapacitor applications with electrolyte and electrode materials are discussed.

Selective metal ions doped CeO2 nanoparticles for excellent photocatalytic activity under sun light and supercapacitor application

Facile synthesis and magnetic properties of Fe3C/C nanoparticles via a sol–gel process

Recent advances on metal-organic frameworks (MOFs) and their applications in energy conversion devices: Comprehensive review

Facile synthesis and first principles calculations of Li-MoS2/rGO nanocomposite for high-performance supercapacitor applications