Ni–Mn hydroxides as new high power electrode materials for supercapacitor applications (original) (raw)
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This study aims to quantify the synergistic effect of Ni2+ and Mn2+ ions on the capacitive performance of oxide, hydroxide and phosphate electrodes in alkaline electrolytes. Three types of phases containing both nickel and manganese in a ratio of one-to-one were selected due to their stability in alkaline media: oxides with ilmenite and spinel structures (NiMnO3 and Ni1.5Mn1.5O4); hydroxides with layered structures (β-Ni1/2Mn1/2(OH)2); and phosphates with olivine and maricite structures (LiNi1/2Mn1/2PO4 and NaNi1/2Mn1/2PO4). In the mixed hydroxides and phosphates, Ni2+ and Mn2+ ions randomly occupied one crystallographic site, whereas in the ilmenite oxide, a common face was shared by the Ni2+ and Mn4+ ions. The electrochemical parameters of the Ni–Mn compositions were evaluated in asymmetric hybrid supercapacitor cells working with alkaline electrolytes and activated carbon as a negative electrode. A comparative analysis of oxides, hydroxides and phosphates enabled us to differenti...
Herein, we develop the first flexible, low-cost and high-performance hybrid electrode based on MnO2 and various levels of Ni doped MnO2 by employing a chemical precipitation method and characterized by various techniques. The X-ray diffraction patterns indexed to the tetragonal structure of α-MnO2. Morphological studies show the synthesized particles to be combined nanospherical with nanorod structure. Their capacitive behaviour was studied by cyclic voltammetry, galvanostatic charge-discharge studies and impedance analysis. Among the various level of doping the specific capacitance of the MnO2: Ni (0.075 M) exhibited a highest specific capacitance of 765 F/g than pure MnO2 (212 F/g).
At present world facing major problems of rapid growth of population and global economy due to this demand for energy consumption has been considerably increased. Supercapacitor devices are emerging as one of the promising energy devices for the future energy technology. In this regards, the transition metal oxides are suitable electrode materials for pseudocapacitors due to different oxidation states and different ions. In this review article, we focused on the pure nickel oxide based materials synthesizing by various synthetic methods. Nowadays nickel oxide is emerging electrode material for energy storage application due to its thermal stability, high chemical stability, high theoretical specific capacity, low price, naturally abundant and environment friendliness. There are three important factors on which performance of supercapacitor mainly depends on namely electrochemical properties of the electrode material, electrolyte and voltage range. In this review paper, storage mechanism of supercapacitors with their types, characteristics of the electrode material, different synthesis methods of nickel oxide electrode material and different electrolyte materials have been reported.
Inorganic Chemistry Communications, 2022
In electrochemical energy storage devices, improving the availability of ions in the electrodes for charge storage and rate performance is a challenging task in the present era. So, in this report, an attempt was made to prepare Zn and Mn co-doped NiO nanostructures with improved electrochemical performance. The structural study revealed pure, and co-doped NiO nanostructures crystallize into face-centred cubic geometry with space group Fm3m. A prominent decrease in grain size was noticed with the increase in Mn concentration, showing an inverse relation with the optical bandgap. The room temperature ferromagnetism was improved by Mn doping. The electrochemical study proves the pseudocapacitive nature, with enhanced specific capacitance (846.71 Fg 1) in Ni0.9Zn0.04Mn0.06O nanoparticles. The galvanostatic charge–discharge study revealed a power density of 8900 W/kg at an energy density of 12.47 Wh/kg in Ni0.9Zn0.04Mn0.06O nanostructures. The improved specific capacitance, fascinating charging-discharging ability, and high-power density of Ni0.9Zn0.04Mn0.06O nanostructures makes it a special candidate for high-performance supercapacitor.
Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices
Materials, 2018
Nanocomposites of Ni(OH) 2 or NiO have successfully been used in electrodes in the last five years, but they have been falsely presented as pseudocapacitive electrodes for electrochemical capacitors and hybrid devices. Indeed, these nickel oxide or hydroxide electrodes are pure battery-type electrodes which store charges through faradaic processes as can be shown by cyclic voltammograms or constant current galvanostatic charge/discharge plots. Despite this misunderstanding, such electrodes can be of interest as positive electrodes in hybrid supercapacitors operating under KOH electrolyte, together with an activated carbon-negative electrode. This study indicates the requirements for the implementation of Ni(OH) 2-based electrodes in hybrid designs and the improvements that are necessary in order to increase the energy and power densities of such devices. Mass loading is the key parameter which must be above 10 mg•cm −2 to correctly evaluate the performance of Ni(OH) 2 or NiO-based nanocomposite electrodes and provide gravimetric capacity values. With such loadings, rate capability, capacity, cycling ability, energy and power densities can be accurately evaluated. Among the 80 papers analyzed in this study, there are indications that such nanocomposite electrode can successfully improve the performance of standard Ni(OH) 2 (+)//6 M KOH//activated carbon (−) hybrid supercapacitor.
Nano α-NiMoO4 as a new electrode for electrochemical supercapacitors
RSC Advances, 2012
Nickel molybdate (a-NiMoO 4 ) nanoparticles were prepared by a solution combustion synthesis (SCS) technique and, for the first time, were studied as a potential electrode material for supercapacitors. High specific capacitance (1517 F g 21 ) and energy density (52.7 W h Kg 21 ) were delivered by nano-a-NiMoO 4 at a current density of 1.2 A g 21 , due to the pseudocapacitive nature of the material.
Applied Sciences
MnO2 is the most favorable material in power storage due to its technological significance and potential applications in pseudocapacitance (due to various oxidative states allowing efficient charge transfer to meet energy demands), where its properties are considerably influenced by its structure and surface morphology. In the present study, a facile hydrothermal route was used to produce different phases of MnO2 (α, β, and γ) with different morphologies. The electrochemical performance of the synthesized phases was studied in aqueous sodium sulfate as an electrolyte. X-ray diffraction, UV–Vis spectroscopy, and Fourier-transform infrared spectroscopy were used to characterize the synthesized material. The surface morphology and topography were examined using field-emission scanning electron microscopy. The direct band gap of α-, β-, and γ-MnO2 was found to be 1.86 eV, 1.08 eV, and 1.68 eV, lying in the semiconducting range, further enhancing the electrochemical performance. It was f...
Recent progress in nickel oxide-based electrodes for high-performance supercapacitors
Current Opinion in Electrochemistry, 2020
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International Journal of Scientific Research in Science and Technology, 2021
Mn3O4 and its composite nanomaterials have become promising candidate as an electrode for supercapacitor devices, because of its low cost, non-toxicity, large abundance, high porosity and high capacitance values in aqueous electrolyte. Here, we systematically summarized the impact of different morphologies of Mn3O4 and its composite nanomaterials on supercapacitive performance. Many researchers synthesized various Mn3O4 and its composite nanomaterials of exceptional properties and different morphologies for energy storage. This article reviews recent efforts and developments in synthesis methods Mn3O4 and its composite nanomaterials as an electrode material in supercapacitor.