Nanostructured Metal Oxides for Supercapacitor Applications

Makgopa, Katlego; Bello, Abdulhakeem; Raju, Kumar; Modibane, Kwena D.; Hato, Mpitloane J.

doi:10.1007/978-3-030-04474-9_6

Cited by 10 publications

(6 citation statements)

References 194 publications

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“…Because of their attractive structural and electrochemical characteristics, metal oxides (e.g., MnO 2 , CoO, V 2 O 5 , RuO 2 , NiO, and CuO) and their composites have been applied widely for supercapacitors [ 56 , 57 , 58 ]. The ability to attain relatively high pseudocapacitive performance, arising from their many valence state transitions, is key to their electrochemical characteristics [ 59 ]. Combining lignin with metal oxides can improve the electrochemical characteristics of electrodes [ 60 , 61 , 62 , 63 , 64 ].…”

Section: Fundamentals Of Ligninmentioning

confidence: 99%

Lignin-Derived Quinone Redox Moieties for Bio-Based Supercapacitors

et al. 2022

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Because of their rapid charging and discharging, high power densities, and excellent cycling life stabilities, supercapacitors have great potential for use in electric vehicles, portable electronics, and for grid frequency modulation. The growing need for supercapacitors that are both efficient and ecologically friendly has generated curiosity in developing sustainable biomass-based electrode materials and electrolytes. Lignin, an aromatic polymer with remarkable electroactive redox characteristics and a large number of active functional groups, is one such candidate for use in renewable supercapacitors. Because its chemical structure features an abundance of quinone groups, lignin undergoes various surface redox processes, storing and releasing both electrons and protons. Accordingly, lignin and its derivatives have been tested as electroactive materials in supercapacitors. This review discusses recent examples of supercapacitors incorporating electrode materials and electrolytes derived from lignin, focusing on the pseudocapacitance provided by the quinone moieties, with the goal of encouraging the use of lignin as a raw material for high-value applications. Employing lignin and its derivatives as active materials in supercapacitor electrodes and as a redox additive in electrolytes has the potential to minimize environmental pollution and energy scarcity while also providing economic benefits.

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Section: Fundamentals Of Ligninmentioning

confidence: 99%

Lignin-Derived Quinone Redox Moieties for Bio-Based Supercapacitors

et al. 2022

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“…In the context of the analysis about which materials could serve as optimal electrodes for pseudocapacitors, four key factors need to be taken into consideration: (1) high surface area for the redox reactions, (2) doping of the materials to increase the redox state and their conductivity, (3) a wide potential window, and (4) a high charge/discharge rate. − About the different materials, conducting polymers and transition-metal oxides can be found to meet these requirements; however, metal oxides are generally considered the main candidates that can be used as electrode materials in supercapacitors because of the wide variety of oxidation states that allows for redox charge transfer, together with other excellent properties to be used as electrodes in supercapacitor devices for energy storage applications (such as high specific surface area, high conductivity, abundant reserves, environmental geniality, etc.). Therefore, among the different metal oxides, the most widely used oxides as electrodes for pseudocapacitors include tin oxide (SnO 2 ), ruthenium oxide (Ru 2 O), cobalt oxide (Co 3 O 4 ), nickel oxide (NiO), iron oxide (Fe 2 O 3 ), vanadium oxide (V 2 O 5 ), copper oxide (CuO), tungsten oxide (WO 3 ), iridium oxide (IrO 2 ), molybdenum oxide (MoO 3 ), manganese oxide (MnO 2 ), and so forth. − Among these metal oxides, ruthenium oxide has attracted a lot of attention due to its high conductivity, good thermal stability, and excellent electrochemical performance; however, its high environmental toxicity and high cost hinder its commercialization as an electroactive material for supercapacitor applications.…”

Section: Introductionmentioning

confidence: 99%

High-Performance 3D Nanostructured Silver Electrode for Micro-Supercapacitor Application

González,

García,

Vega

et al. 2023

ACS Omega

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In the current energy crisis scenario, the development of renewable energy forms such as energy storage systems among the supercapacitors is an urgent need as a tool for environmental protection against increasing pollution. In this work, we have designed a novel 3D nanostructured silver electrode through an antireplica/replica template-assisted procedure. The chemical surface and electrochemical properties of this novel 3D electrode have been studied in a 5 M KOH electrolyte. Microstructural characterization and compositional analysis were studied by SEM, energy-dispersive X-ray spectroscopy, XRD technique, and Kripton adsorption at −198 °C, together with cyclic voltammetry and galvanostatic charge−discharge cycling measurements, Coulombic efficiency, cycle stability, and their leakage current drops, in addition to the self-discharge and electrochromoactive behavior, were performed to fully characterize the 3D nanostructured electrode. Large areal capacitance value of 0.5 F/cm 2 and Coulombic efficiency of 97.5% are obtained at a current density of 6.4 mA/cm 2 for a voltage window of 1.2 V (between −0.5 and 0.8 V). The 3D nanostructured silver electrode exhibits excellent capacitance retention (95%) during more than 2600 cycles, indicating a good cyclic stability. Additionally, the electrode delivers a high energy density of around 385.87 μWh/cm 2 and a power density value of 3.82 μW/cm 2 and also displays an electrochromoactive behavior. These experimental results strongly support that this versatile combined fabrication procedure is a suitable strategy for improving the electrochemical performances of 3D nanostructured silver electrodes for applications as micro-supercapacitors or in electrochemical devices.

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“…The electrochemical capacitors have been developed to work as the next generation . In this generation, carbon materials including graphene (Gr), carbon nanotubes (CNTs), carbon nanofibers (CNFs), ordered mesoporous carbons (OMCs), porous carbons (PCs), carbon aerogels (CAs), and activated carbons (ACs) may serve as redox electrodes, which are separated by an organic or aqueous electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

Veerakumar

Sangili

Manavalan

et al. 2020

Ind. Eng. Chem. Res.

158

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Recently, transition metal/metal oxides (TMMOs) decorated on porous carbons (PCs) have been intensively focused on designing rational electrode materials for the promising future specific category of electrochemical energy storage and conversion technologies. In particular, TMMO incorporation with PC structures has become very attractive in the area of supercapacitors (SCs) mainly caused by their large accessible surface areas (SSA), together with the suitable pore size distributions (PSD), high electrical conductivity, and rapid redox reactions reversibly on the surface. The transportation of ions, as well as electrons in the bulk of electrodes, is fast as a result of optimal contact between electrodes and electrolytes at the electrode–electrolyte interface, thereby generating high specific capacities (C sp) of these PCs with TMMOs. We report a survey regarding recent advances in the fabrication and synthesis of TMMOs decorated on PCs with some physical characteristics and their applications for electrochemical capacitors. Some future trends and prospects for further development of the subject nanocomposites in application to next-generation supercapacitors are discussed.

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Nanostructured Metal Oxides for Supercapacitor Applications

Cited by 10 publications

References 194 publications

Lignin-Derived Quinone Redox Moieties for Bio-Based Supercapacitors

Lignin-Derived Quinone Redox Moieties for Bio-Based Supercapacitors

High-Performance 3D Nanostructured Silver Electrode for Micro-Supercapacitor Application

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

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