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In the present work, we report the successful fabrication of dandelion-like Nickel–Cobalt Sulfide@Polypyrrole microspheres through the hydrothermal method and its possible application as a binder-free electrode in supercapacitors. This electrode exhibited low charge transfer resistance with a remarkable specific capacitance of 2554.9 F g⁻¹ at 2.54...
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To fulfill the increasing energy demand, it is necessary to develop such an electrode material for pseudocapacitors having a high energy density, better cycle life, and potential for commercialization. Herein, we report an electro-codeposition technique to fabricate a high-performance V 2 O 5-PANi composite deposited on the metallic Nickel foam sub...
The present work emphasizes the fabrication of pioneering electrodes (α-Ag2S, silver sulfide) for high-performance supercapacitors via simple chemistry approach. α-Ag2S nanomaterials prepared in the present study exhibited a unique morphology with highlighting electrochemical features. When tested as an electrode material in three-cell configuratio...
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... It enables the fabrication of supercapacitor devices because signicant power and energy density have been achieved. [56][57][58] Electrochemical impedance spectroscopy (EIS) measurements were performed at 5 mV in the frequency range from 0.001 Hz to 100 kHz to understand the charge transfer mechanism at the electrode-electrolyte interface. Fig. 8c shows the Nyquist plot of the Co-CeO 2 /SnO 2 sample with its equivalent circuit. ...
The photochemical reduction approach, distilled H2O with PrⁱOH as the solvent medium, was used to create and characterise the conversion of Co³⁺ to Co²⁺ integrated on CeO2/SnO2. The PXRD, IR, SEM, HR-TEM, VSM, and XPS results show that the materials generated have appropriate crystallisation form and retain the hollow spherical structure of Co–CeO2/SnO2. The performance of several UV-light energetic photocatalysts and the reaction pathways for inorganic complex degradation are addressed, emphasising the main elements contributing to their mineralisation. Reaction mechanisms, identification and quantification of degradation intermediates, and effects of reactive active species were described and analysed for each modelled target inorganic pollutant category. The ternary (Co³⁺/Co²⁺)/CeO2/SnO2 materials were hypothesised to improve the photocatalytic activity by increasing the transport rate of eCB⁻ impurities as a result of accelerating the practical separation of electron–hole (e⁻/h⁺) pairs. Then, it exhibits high cycling stability by successfully reducing the pulverisation of Co–CeO2/SnO2 electrode materials due to volume expansion and a high specific capacity of 827 F g⁻¹(1 A g⁻¹) while maintaining a high current density of 5 A g⁻¹. GCD and impedance spectroscopy studies were also carried out to analyse charge–discharge cycles and sample stability. This exceptional electrochemical performance suggests that Co–CeO2/SnO2 are promising for high-performance energy storage systems.
... V. Additionally, distinct shoulders can be observed in both the charge and discharge curves. It implies that the capacitance is mainly attributed to the faradic reaction and that the sample is a pseudo-capacitive material [30]. Furthermore, the specific capacitance of the ZnS-NiS 2 -1:7 sample was calculated using the Formula (1). ...
Transition metal sulfides have excellent electrochemical performance and show great potential for improving the energy density of asymmetric supercapacitors. This study demonstrates a two-step synthesis technique and highlights the enhanced energy storage efficiency of ZnS-NiS2 composite materials for asymmetric supercapacitors. The composite materials of ZnS nanosheets and NiS2 nanocrystals are characterized by a rough surface and spherical shape. The sample with the optimal ratio (ZnS-NiS2-1:7) exhibits a maximum specific capacitance of 1467.9 F g−1 (550.5 C g−1) at 1 A g−1. The specific capacitance of the ZnS-NiS2-1:7 sample is 26.1% higher compared to the pure NiS2 sample. Furthermore, the assembled ZnS-NiS2-1:7//AC device shows a high specific capacitance of 127.8 F g−1 (217.3 C g−1) at 1 A g−1 and an energy density of 51.3 Wh kg−1 at a power density of 820.8 W kg−1. The ZnS-NiS2-1:7 sample has exceptional energy storage capability on its own, but it can also be composited with graphene to further increase the specific capacitance (1681.0 F g−1 at 1 A g−1), suggesting promising prospects for the ZnS-NiS2-based composite material in the future.
... Pseudocapacitive behavior, as evidenced by the redox couple at each scan rate ( Figure 5A-C), is displayed by the CV curves (2-300 mV/s) of all the MOFs. 47 The Ni-Co-based MOF shows the combination of EDLC with pseudo-capacitance behavior. 48 The faster reaction rate and shorter time required for electrons to emit for couplings seen across all samples indicates the role of diffusion-controlled phenomena during faradic charge transfer. ...
Metal‐organic frameworks (MOFs) possess several desirable properties, including a homogeneous crystal structure, variable porosity, high surface area, and a notable adsorption affinity, making them highly promising contenders for deployment as electrode materials in supercapacitors (SCs) and water electrolyzers, which are acknowledged for the ever‐increasing demand for instantaneous energy. Herein, we report the rationally assembled Ni‐Co‐based bimetallic MOF compounds using a glutaric acid as an organic ligand and low‐temperature hydrothermal treatment that surmounts the electrocatalytic and electrochemical charge storage activity in an alkaline medium. The NiCo‐MOF surpassed the hydrogen evolution reaction (HER) among other as‐synthesized materials, exhibiting the least overpotential of 182 mV at 10 mA/cm² of current density, showed splendid kinetics with a turnover frequency of 2.86 s⁻¹, and higher stability after 1000 HER cycles in 1 M KOH. Furthermore, NiCo‐MOF impetuses were employed for SC application and displayed the highest specific capacitance of 978 F/g than Ni‐MOF (706 F/g) and Co‐MOF (91 F/g) at 1 A/g of current density. Theoretical studies exhibited that the optimal electronic coupling and synergistic effect due to Ni‐Co sites enhances the overall electronic properties of NiCo‐MOF. Therefore, enhancing its electrochemical performance concerning water‐splitting and charge storage. This study showcases a novel approach for producing ultrathin and flexible bimetallic MOF‐based electrode material to enrich the performance in electrocatalytic HER and SCs.
... Electrode materials are considered the main area of interest in supercapacitor research since they form the system's heart [110][111][112]. Recently, efficient and compatible CPs-based composites have been introduced for electrode materials of SCs by different researchers, such as NiCoP/CNT/PPy, NiCo2S4/PPy, PANI/CNT/e-MoS2, MXene/PANI/MWCNTs, Carbon cloth/PANI/MnO2, and others [110][111][112][113][114][115][116][117][118][119]. The supercapacitive performances of these nanocomposite-based materials are illustrated in table 4. ...
A special family of polymers known as conducting polymers (CPs) is able to carry charge via conjugated double bonds. CPs are intricate dynamic structures that capture the interest of those working in the field of intelligent materials. Electrical stimulation can cause significant changes in the electrical, mechanical, and chemical features of CPs. Nanocomposites made of CPs have been used in sensors, batteries, flexible electronics, and supercapacitors (SCs). A supercapacitor is a device used to store electrical charge through electrostatic and electrochemical processes. They have the potential to replace conventional batteries and capacitors. They have been used in the automotive, railways, military, renewable, and power industries. The development of electrical parameter models, reliability testing, and industry norms are all challenges that SCs are now dealing with. In this article, the introduction of supercapacitors (SCs), the potential of different types of CPs-based nanocomposite materials in the electrode material of SCs, current studies, future perspectives, opportunities, and challenges have been discussed.
... 17 Barazandeh et al. deposited nanostructured NiCo 2 S 4 @PPy on nickel foam through a hydrothermal process to fabricate an additive-less electrode, showing a specific capacitance of ∼2555 mF g −1 at 2.54 A g −1 that retained 85% initial capacitance after 1500 cycles at 150 mV s −1 . 18 Elmessiry et al. directly electrospun polyindole (PIND)/PAN/GO nanofibers on the stainless steel collector, which is then utilized as an additive-less electrode. The composite shows a specific capacitance of ∼3.42 F g −1 at 0.05 A g −1 , higher than the ∼1.68 F g −1 of PIND/PAN nanofibers. ...
... This is a slight Warburg impedance behavior occurring at 45° from the horizontal axis, after which the line becomes almost vertical, indicating good capacity values. This behavior was observed in NiO on activated carbon electrodes, with steep slopes for the Warburg impedance, and the impedance data could be fitted with a modified Randles circuit consisting of two resistors, two capacitors, and a Warburg element [44]. In Figure 6, the equivalent circuit representation is shown as an inset of the Nyquist plot of NiO/Ni in the three-electrode arrangement. ...
Transition metal oxide aerogels are a fascinating class of compounds that have received considerable attention in the last decade owing to their unique and exceptional properties, including high porosity, large surface area, and ultralow density. In this study, α-Ni(OH)2 aerogels and annealed NiO/Ni aerogels were used to design and fabricate a two-electrode supercapacitor device. The physicochemical properties of the as-synthesized aerogels were characterized through X-ray diffraction, scanning electron microscopy, transmission electron microscopy, the Brunauer–Emmett–Teller theory, and X-ray photoelectron spectroscopy studies. The annealed NiO/Ni aerogels showed a (specific capacitance of 1060 F/g) specific capacity of 422 C/g at 1 A/g current density and with good cycling stability (up to 10,000 cycles). The supercapacitor also demonstrated an energy density of 32.4 Wh/kg and power density of 1800 W/kg at a current density of 2 A/g. The specific capacitance of NiO/Ni aerogels was more than twice that of the α-Ni(OH)2 aerogels. The practical applications of the aerogel were demonstrated by fabricating a two-electrode device.
