Capacitance Of Supercapacitor Research Articles

An investigation of the electrochemical characteristics of NiO-Co3O4/graphite/PVDF composites for the development of a supercapacitor with ultrahigh stability

Abstract Supercapacitor is a groundbreaking electrical energy storage technology that falls between batteries and dielectric capacitors which has undergone significant progress in recent years. Among the several elements influencing a supercapacitor's capacitance, the choice of electrode materials plays a crucial role. Nanomaterials formed from transition metal oxides with incorporated 3-D graphite are said to possess high capacitance, conductivity, increased area of active site, distinct redox properties, and several valence shells, making them an appropriate material for electrode synthesis. Therefore, in this study, three composites of NiO and Co3O4 are prepared in the ratio 2:8, 3:7 and 4:6 using facile sol-gel method. To the prepared composites, graphite and PVDF are added in equal quantities. The resultant samples are characterized using XRD, SEM, FTIR and UV-Vis spectroscopy. The samples are further integrated on an FTO electrode and subjected to CV, GCD and EIS for electrochemical study. The highest specific capacitance is obtained for NiO and Co3O4 composite in the ratio 3:7 and is equal to 156.66F/g at a sweep rate of 10 mV/s. This material is further used for a two-electrode study to check the feasibility of a symmetric solid-state device, which demonstrated a specific capacitance of 36F/g with 100% capacitive retention.

Adsorption and energy storage characteristics of ionic liquids in porous zeolite-templated carbon materials

The energy storage capacity of supercapacitors is closely related to the capacity of their electrode materials to adsorb electrolytes. Porous zeolite-templated carbon (ZTC) materials are a type of porous carbon material with a well-defined spatial structure and are thus promising electrode materials. This study utilizes molecular dynamics simulations to compare the ion number density and charge density distributions of the [EMI][BF4] ionic liquid for various ZTC materials, while also examining the ion adsorption characteristics for different electrode charges. Parameters such as the degree of confinement (DOC) and the charge compensation per carbon (CCpC) are introduced to represent the ion adsorption and charge storage capacity of the materials, with a higher DOC indicating a greater number of encapsulated ions and a higher CCpC indicating a more efficient charge storage. The findings suggest that materials with a larger pore size tend to exhibit increased ion adsorption. However, many CCpC adsorption sites that can store more charge are then found in positions with a smaller DOC. This work unveils the ion adsorption characteristics of ZTC materials in charged electrode and presents the differential capacitance curves of various materials, thereby providing a theoretical foundation for the utilization of ZTC materials as electrodes in supercapacitors.

Polymerized lignin based carbon nanofiber for high-performance energy generator and storage

Lignin is an ideal precursor for the preparation of lignin-based materials. However, the lack of molecular weight, thermal stability and spatial configuration of lignin hinder the practical application of lignin in lignin-based carbon materials. Herein, a novel and effective strategy for preparing high-performance lignin-based carbon nanofibers (CFs) is designed. Lignin samples with different chemical structures are prepared by polymerization modification and fractionation. This strategy completely gets rid of the dependence on petroleum-based polymers in the electrospinning process, and makes the lignin-based CFs show good performance in energy storage, temperature sensor, and moisture power generation. The specific capacitance and energy of lignin-based supercapacitors reach 357.2 F/g and 31.5 Wh/kg, respectively. The CFs exhibit good flame retardancy and thermal sensitivity, and the response time is 1 s. In addition, moisture power generators assembled with CFs exhibit great potential. The output voltage of moisture power generators has a linear relationship with the number of devices. With the increase of series equipment, the output voltage of 5 series moisture power generators is 4.7 V. This work provides a new approach to prepare high-performance lignin-based carbon nanofibers, which has a good application prospect in the fields of energy storage, sensing and power generation.

Evaluating the synergistic effect of co-sputtered W-TiN and W-CrN electrodes for superior capacitance in hybrid supercapacitors

Evaluating the synergistic effect of co-sputtered W-TiN and W-CrN electrodes for superior capacitance in hybrid supercapacitors

High-performance NF-loaded F-NiFe-LDH/rGO nanoflower/nanosheet composite electrode material achieving enhanced specific capacitance and energy density for supercapacitor

High-performance nanostructured F-NiFe-LDH/rGO composite electrode materials with F-NiFe-LDH nanoflowers and rGO nanosheets are synthesized in a controlled hydrothermal method by leveraging the strong synergistic effects between the components, enabling the construction of F-NiFe-LDH/rGO//AC asymmetric supercapacitors. The incorporation of rGO significantly enhances electron transport, resulting in an exceptional specific capacitance of 2860 F g−1 at a current density of 1 A g−1, with a remarkable capacity retention of 102 % after 1000 cycles. This represents a notable improvement in electrochemical energy storage, with surface-controlled capacitance contributing more in alkaline electrolytes for F-NiFe-LDH/rGO composite compared to F-NiFe-LDH alone. The asymmetric supercapacitor device exhibits a specific capacitance of 354 F g−1 at 1 A g−1, maintaining 92.31 % of its initial capacitance after 1000 charge/discharge cycles at 5 A g−1, and achieves an impressive energy density of 110 Wh kg−1 at 1 A g−1. The innovation of this work lies in the controllable preparation of nanostructured F-NiFe-LDH-rGO supercapacitor electrode material with enhanced specific capacitance and energy density by the synergistic effect between F-NiFe-LDH and rGO. This work offers a solid foundation for creating high-performance supercapacitor electrode materials and devices for energy storage applications.

Hollow-structured and nano-flower shaped high entropy layer double hydroxide for superiority specific capacitance and rate capability of supercapacitor

High entropy hydroxide as electrode materials has been widely studied in the field of supercapacitors, but due to the limited active site and poor conductivity, it usually shows poor specific capacity and magnification performance, which seriously limit its development in the field of supercapacitors. In this work, a hollow-structured and nano-flower shaped high entropy layer double hydroxide was synthesized by the double template method combined with nano-etching to achieve superiority specific capacitance and rate capability of supercapacitor. The experimental and theoretical results indicate that the specific capacitance of this novel electrode material is as high as 1820.1 F·g−1. In particular, after the current density was increased by 40 times, the specific capacitance can reach 1140.2 F·g−1, and its electrochemical performance is higher than most of high entropy electrode materials reported so far. More importantly, the S-HE-LDH//AC HSC was constructed with the material as the electrode. It has an energy density of 74.2 Wh·kg−1 at 475 W·kg−1 power density. After 5000 cycles, the specific capacitance of the HSC device can still maintain 90.8 % of its initial value. These results indicate that the electrochemical properties of LDHs can be effectively improved by the combination of microstructure adjustment and electronic structure optimization.

Construction of ion/electron transfer multi-channels for the composite film electrode from GO and cellulose derived porous carbon in supercapacitor

Due to excellent flexibility and dispersibility, 2D graphene oxide (GO) is regarded as one of the prospective materials for preparing self-supporting electrode material. Nevertheless, the self-stacking characteristic of GO significantly restricts the ion transmission and accessibility in GO-based electrodes, especially in the direction perpendicular to the electrode surface. Herein, a novel composite film was fabricated from GO and 3D porous carbon (PC) through vacuum filtration combined with thermal reduction strategy. The combination of GO and PC not only avoids the self-stacking of GO, but also exposes more active sites for ions in the inner. A massive released nitrogen and oxygen-containing gases during the thermal reduction endows the reduced graphene oxide (RGO) with abundant porous and CC, which contributes to the energy storage in the direction perpendicular to the electrode surface. Besides, the high specific surface area of the prepared composite film is favorable for the storage and release of charge on the electrode surface. Benefiting from the above characteristics, the electrode assembled by the as-prepared film exhibits ultrahigh areal/volumetric specific capacitance in supercapacitor and ZIHCs (Zinc ion hybrid capacitors). This work provides a promising approach for the development of advanced self-supported electrode materials with desirable electrochemical properties.

Novel Design and Synthesis of Ni-Mo-Co Ternary Hydroxides Nanoflakes for Advanced Energy Storage Device Applications

Three-dimensional interconnected mesoporous nanoflakes of amorphous Ni-Mo-Co trimetallic hydroxides were successfully deposited on a Ni foam (NF) using a facile, environmentally friendly, and scalable electrochemical deposition method. The elemental composition of the nanoflakes, including Ni2+, Mo6+, and Co2+, was characterized by X-ray photoelectron spectroscopy (XPS), while the morphology and particle size of the synthesized nanomaterials were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Ni-Mo-Co trimetallic hydroxides on NF were employed as binder-free electrodes for supercapacitors. The Ni-Mo-Co trimetallic hydroxides with a Ni/Mo/Co ratio of 1/1/0.4 exhibited outstanding long-term cyclability over 5000 cycles, with a high reversible specific capacitance of 2700 F g−1 and a high capacitance retention of 96.63% at 10 A g−1. Furthermore, they demonstrated excellent rate performance, maintaining a capacitance of 2429 F g−1 at a current of 50 A g−1, which corresponds to approximately 80% capacitance retention compared to the capacitance at 2 A g−1. The superior performance of these Ni-Mo-Co trimetallic hydroxides can be attributed to their mesoporous hierarchical architecture, which provides large open spaces between the interconnected nanoflakes, numerous electroactive surface sites, facile electron transmission paths, and the synergistic effects of the trimetallic components. These findings demonstrate that Ni-Mo-Co trimetallic hydroxides are promising electrode materials, offering both high capacitance and long-term cyclability for supercapacitors.

Comparative study of laser-induced graphene fabricated in atmospheric and interface-confined environments

Laser-induced graphene (LIG) has found widespread applications in various carbon-based electronics, such as sensors, optoelectronics, and energy storage devices, due to its low cost, high efficiency, and large-scale fabrication potential. Here, two laser-induced carbonization techniques are investigated in terms of structural integrity (uniformity and densification) and electrical property by a combined experimental and theoretical approach; these techniques, namely interface and surface ablation, operate in confined and ambient environments, respectively. The property of LIG for each laser-induced carbonization technique is systematically studied using optical and electrical characterization methods. The results show that the naturally confined and oxygen-free environment of interface ablation can fabricate more compact and intact LIG than surface ablation in an open and oxygen environment, thus enabling a 7.6 times reduction of the square/sheet resistance. The underlying mechanism for these improved properties is the compressive thermal stress and higher carbonization efficiency of interface ablation. The better structural integrity and electrical property of interface-ablated graphene enable a four-fold improvement in the specific areal capacitance of supercapacitors. These findings present that interface ablation is a more effective and facile method to enable the scalable preparation of intact and highly conductive LIG for its potential use in high-performance carbon-based electronics.

CO2-regulated, ultrahigh-concentration aqueous electrolytes for high energy and power of supercapacitors

Aqueous supercapacitors are recognized for their high power density, ultralong cycle life, and reliable safety. However, their widespread applications are impeded by low energy density arising from the narrow electrochemical stability windows of aqueous electrolytes. Although the use of high-concentration aqueous electrolytes can mitigate this issue, sluggish ion diffusion within these electrolytes results in decreased capacitance and power performance of supercapacitors. Herein, we propose the simultaneous achievement of high energy and power density of supercapacitors using carbon dioxide (CO2)-regulated high-concentration aqueous electrolytes. The introduction of CO2 enables greater capacitance in sodium perchlorate (NaClO4)-containing electrolyte than sodium nitrate (NaNO3)- and sodium bis (fluorosulfonyl)imide (NaFSI)-containing electrolytes. This is attributed to the increased H+ concentration and the unique interaction between CO2 and ClO4−, leading to a denser counter-ion arrangement on the electrode surface. Notably, the CO2-regulation strategy is effective in a nearly-saturated 17 mol kg−1 NaClO4 electrolyte, showing an increase in energy density of up to 27.8 %, while maintaining a high 2.2 V operating voltage and a long >20 000 cycle life of supercapacitors. This study offers a distinct insight into the regulation of high-concentration aqueous electrolytes for comprehensive enhancement of supercapacitor performance.

Highly porous carbon with selective transformation of nitrogen groups boosts the capacitive performance through boric acid template assisted strategy

To address the extensive demand for energy storage, the development of unique carbon-based supercapacitors represents a viable solution. We successfully synthesize the unique boron (B), nitrogen (N)-containing porous carbon (denoted as BNPC) from reed biomass through one-step boric acid templated carbonization method, which are used as high-performance carbon electrode for electric double-layer capacitor (EDLC). By the synergistic effects of boric acid template and N-rich melamine, a well-balanced micro‐/meso-porous structure and abundant N and oxygen (O) heteroatoms within BNPC are readily obtained, exhibiting an ultrahigh specific surface area of 2619 m2·g−1. These distinctive natures endow BNPC electrode with the excellent capacitive behaviors, affording an outstanding specific capacitance of 396.8 F·g−1 at a three-electrode (3E) system with KOH electrolyte. Density functional theory (DFT) method is utilized to further clarify the interaction mechanism between K and designed graphene with various N configurations, revealing the significant roles of Pyridinc-N and Graphitic-N. The two-electrode (2E) symmetric supercapacitor assembled by BNPC electrodes in TEABF4 electrolyte demonstrates an extremely high energy density of 51.82 Wh·kg−1 at a power density of 375 W·kg−1 and great capacitance retention of 91 % after 6000 cycles. This reed-derived highly porous carbons display superior electrochemical performance, making it the ideal candidates for large capacity supercapacitors in practice.

High performance symmetric supercapacitors based on Au incorporated CrN thin films fabricated by reactive magnetron sputtering

Recently, transition metal nitrides are being investigated extensively as potential supercapacitor material. In the present study, Au incorporated CrN (Au_CrN) thin films have been synthesized using reactive magnetron co-sputtering technique for application as supercapacitor electrode material. Films have been prepared at different Ar to N2 flow rates keeping total deposition pressure constant to achieve the required structural phase in the sample. Electrochemical properties of the deposited materials have been investigated with a three-electrode system in 0.5 M H2SO4 aqueous electrolyte. The CrN thin film deposited under 3:1 Ar: N2 partial pressure or flow rate ratio shows the highest specific capacitance. Upon Au incorporation, the film shows an areal capacitance of 56.8 mFcm−2 at 1.0 mAcm−2discharge current density which is an almost nine-fold enhancement in specific capacitance value compared to pristine CrN sample. Symmetric supercapacitors have also been developed by sandwiching two identical Au_CrN thin film electrodes, which have found to deliver excellent specific capacitance of 86.03 mFcm−2at 1.0 mAcm−2 discharge current density with no decline in capacitance value till 20,000 cycles. Furthermore, it can deliver a high energy density of 52.02mWhcm−2and a power density of 0.12mWcm−2. The electrochemical properties of the supercapacitors fabricated with the Au_CrN thin film electrodes are found to be better than most of the results reported so far in the literature with CrN electrodes. Results of the present study clearly demonstrate that these Au enhanced CrN films prepared by easily scalable and highly reproducible magnetron sputtering technique have great potential as a high capacitance supercapacitor electrode material.

Effect of Mixed Morphology (Simple Cubic, Face-Centered Cubic, and Body-Centered Cubic)-Based Electrodes on the Electric Double Layer Capacitance of Supercapacitors.

Supercapacitors store energy due to the formation of an electric double layer (EDL) at the interface of the electrodes and electrolyte. The present article deals with the finite element study of equilibrium electric double layer capacitance (EDLC) in the mixed morphology electrodes comprising all three fundamental crystal structures, simple cubic (SC), body-centered cubic (BCC), and face-centered cubic morphologies (FCC). Mesoporous-activated carbon forms the electrode in the supercapacitor with (C2H5)4NBF4/propylene carbonate organic electrolyte. Electrochemical interference is clearly demonstrated in the supercapacitors with the formation of the potential bands, as in the case of interference theory due to the increasing packing factor. The effects of electrode thickness varying from a wide range of 50 nm to 0.04 mm on specific EDLC have been discussed in detail. The interfacial geometry of the unit cell in contact with the electrolyte is the most important parameter determining the properties of the EDL. The critical thickness of the electrodes is 1.71 μm in all the morphologies. Polarization increases the interfacial potential and leads to EDL formation. The Stern layer specific capacitance is 167.6 μF cm-2 in all the morphologies. The maximum capacitance is in the decreasing order of interfacial geometry, as FCC > BCC > SC, dependent on the packing factor. The minimum transmittance in all the morphologies is 98.35%, with the constant figure of merit at higher electrode thickness having applications in the chip interconnects. The transient analysis shows that the interfacial current decreases with increasing polarization in the EDL. The capacitance also decreases with the increase of the scan rate.

Synthesis of activated carbon and its rGO composite using pomegranate peels: its photocatalytic and electrode material for high capacitance supercapacitor applications

Synthesis of activated carbon and its rGO composite using pomegranate peels: its photocatalytic and electrode material for high capacitance supercapacitor applications

Phenolic resin filled wood-derived hierarchically porous carbon monolith for high areal capacitance supercapacitors

Wood-based electrodes are widely used in supercapacitors due to their renewable and three-dimensional self-supported properties. Low space utilization of wood-based electrodes seriously restricts its practical applications. In this paper, a wood/phenolic resin composite was designed, which can effectively enhance the space utilization of wood and ensure a hierarchical porous structure. The prepared balsa wood/phenolic resin composite-derived electrode obtained a high areal capacitance (8169 mF cm–2), which is 954 % of pure balsa wood-based electrode. Moreover, the assembled symmetrical supercapacitor device exhibits outstanding electrochemical performance, displaying a high areal capacitance of 3.3 F cm–2, and a competitive volumetric energy density of 2.88 mWh cm–3. More importantly, this design has been successfully used to prepare various species wood-derived electrodes. Therefore, as a general strategy, which gives a novel idea for the design of wood-derived electrodes and may affect other fields using wood-based materials.

Self-discharge of redox electrolyte enhanced supercapacitors based on nanosheet-like CoS2

Transition metal sulfides used as electrode materials are becoming increasingly attractive to researchers because of their excellent conductivity and capacitance in supercapacitors with alkaline electrolytes (KOH). However, the mechanism of self-discharge at an open circuit is still unclear. Herein, KOH electrolyte was replaced with redox electrolyte KOH + K3Fe(CN)6 (PFC) to explore the self-discharge mechanism of nanosheet-like CoS2/CC. It was found that the CoS2/CC electrode in the redox electrolyte has high specific capacitance (2325.5 mF cm−2) at the current density of 1 mA cm−2. Afterwards, the self-discharge mechanism and influential factors of redox electrolyte enhanced supercapacitors were investigated using open circuit potential tests and mathematical models. It is worth noting that the device voltage assembled with CoS2/CC electrode decreased from 1.6 V to 0.8 V after the 2680 s in the redox electrolyte, which was faster than the self-discharge time (6435 s) in the KOH electrolyte. The main reason for the rapid self-discharge phenomenon is the limited surface area of the CoS2/CC electrode which has a weak adsorption capacity for redox active groups, allowing charged redox active substances to be transported freely in the electrolyte. At the same time, it objectively shows that the energy stored in the device is constantly dissipating.

Rapid synthesis of Mn-doped NiFe2O4 nanosheet arrays for high-performance hybrid supercapacitors

This research presents an innovative approach to the in-situ fabrication of Mn-doped NiFe2O4 (Mn-NiFe2O4) nanosheet arrays directly on nickel foam substrates. The formation of precursors on the nickel foam substrates is achieved through spontaneous corrosion, followed by a thermal treatment to form the Mn-NiFe2O4 nanosheet arrays. The material's structure and morphology were thoroughly examined, revealing that the addition of Mn transforms the nanoporous structure on the nickel foam into a nanosheet structure. The average thickness of the nanosheets is 30 nm, and their primary composition is Mn-doped NiFe2O4. The resulting highly porous structure of these nanosheets provides numerous active sites and effective electron and ion diffusion channels, thereby increasing charge density and mechanical stability. Electrochemical assays show that the areal-specific capacity of the synthesized electrode material reaches 4.34 C cm−2 (areal-specific capacitance is 8.68 F cm−2) at 1 mA cm−2. Notably, the constructed hybrid supercapacitor achieves a power density of 544 µW cm−2 at an energy density of 390 µWh cm−2. Furthermore, capacitance retention is 95.2% after 5000 charging cycles. Additionally, the assembled device delivers robust and sustained energy output for LED displays and electric toy cars. This method streamlines the production flow of electrode materials, reducing energy consumption while significantly enhancing the areal capacitance of supercapacitors. The assembled hybrid supercapacitor structure diagram and the assembled devices provide power sources for electric toy cars and LED displays.

Enhancing the capacitance and robustness of graphene supercapacitors by adding a coating of activated-carbon/Bi2Al4O9 on their electrodes

Recently, using activated carbon (AC) for supercapacitors (SCs) has attracted attention because such carbon can be easily derived from bio-waste. However, the capacitance of the AC based SCs is in general low. For this reason, we present in this research the synthesis of AC from aquatic water-lily plant, which is considered a pest. First, SCs were fabricated only with graphene electrodes and produced a capacitance (Cs)/Energy-density (E) of 150.3 F g-1/30.1 Wh kg-1. Later, a coating of AC was deposited on the graphene electrodes and now the devices had higher Cs and E of 446.7 F g-1 and 89.4 Wh kg-1, respectively. The Cs/E of the devices was enhanced even more to 641.9 F g-1/128.3 Wh kg-1 after depositing a composite powder of AC/Bi2Al4O9 (BiAl) on the SC electrodes. Thus, the capacitance increased by 197% and 327% after introducing AC and AC/BiAl to the SCs. Other benefits of introducing the AC/BiAl composite to the electrodes were: i) the output voltage was enhanced 40% with respect to the device made with only AC; ii) the capacitance retention for 1000 bending cycles was maintained over 95%, this means that adding the AC/BiAl to the SC electrodes increased the mechanical resistance/stability of the devices; iii) the SCs produced a constant operating voltage of 0.33 V when they immersed in motor oil, which is not commonly reported in the literature; and iv) the SCs maintained a voltage of 0.37 when they are subjected to bending in real time. If no BiAl is added to the SC electrodes, the output voltage is lower (0.15 V). On the other hand, Raman and XPS spectroscopies demonstrated that the devices made with AC/BiAl had on their electrodes oxygen vacancies and chemical species such as: Bi5+/Bi3+/Bi0 and Al3+/Al0, which worked as redox centers for the charge storage. In general, this work demonstrated that it is possible the fabrication of AC-based SCs with capacitances that surpass the values already reported in literature for devices made with AC (50–150 F g-1). Also, we confirmed that adding BiAl to the system increased the robustness (mechanical/electrochemical stability) of the devices, which is of interest for the flexible electronics.

Role of the MnCoGe alloys to enhance the capacitance of flexible supercapacitors made with electrodes of recycled aluminum and carbon nanotubes

Flexible and sustainable supercapacitors (SCs) were fabricated with carbon nanotubes (CNTs) as the anode and recycled aluminium as the cathode (obtained from soda cans). Devices made with the configuration of CNT//Al had maximum energy-densities/capacitances of 97.8 Wh kg−1/313.5 F g−1. Later, MnCoGe (MCG) alloy powders doped with boron (MCG:B) or gallium (MCG:Ga) were incorporated into the SC electrodes and the energy-density/capacitance was enhanced up to 269.5 Wh kg−1/862.3 F g−1. This outstanding increment of the electrochemical performance was caused by the formation of multiple redox centers on the SC electrodes (oxygen vacancies, Mn3+/Mn4+, Co2+/Co3+, and Ge4+/Ge2+/Ge0) as confirmed by XPS and Raman spectroscopies. The SCs made with MCG alloys were immersed in acid (pH=3)/basic (pH=11) aqueous media and electrochemically tested. Surprisingly, the capacitance retention was reduced a maximum of 0.6%, demonstrating their capacity to operate underwater. The tests of bending and charging/discharging cycles demonstrated that the SCs made with the MCG:B powder were the most stable because their capacitance retention was above 95%. In contrast, SCs made with the MCG:Ga alloy had capacitance retentions below 93% after the same tests. Overall, we demonstrated that efficient/flexible/waterproof SCs can be made with low-cost aluminium, which of interest for wearable electronics.

Microwave construction of the 3D porous interconnected structure of NiCoCr medium-entropy alloy with ultra-high specific capacity for supercapacitors and electrocatalysis

The effective design of bifunctional electrodes with unique morphology and remarkable electrochemical properties for energy conversion and storage devices is a promising but challenging endeavor. Herein, self-supporting NiCoCr medium-entropy alloy (MEA) with a hierarchical porous network structure was in situ synthesized on nickel foam (NiCoCr/NF) by a simple and rapid microwave route. The optimal NiCoCr/NF presented an ultra-high specific capacity of 3011.8 C g−1 (1 A g−1) and outstanding charge/discharge sustainability (83.4% retention at 10 A g−1 over 50,000 cycles) due to its multi-component synergistic effect and hierarchical porous structure. Meanwhile, subtle lattice distortions and electron density redistribution in the NiCoCr MEA tuned electronic structures, resulting in a low overpotential and Tafel slope. Aqueous and solid-state asymmetric supercapacitors were fabricated by using NiCoCr/NF as a cathode and Bi/NF as an anode. The aqueous supercapacitor displayed an exceptional energy density of 314.4 Wh kg−1 at a power density of 800 W kg−1 with 81.8% retention at 10 A g−1 over 20,000 cycles. This study provides a new strategy for the efficient synthesis of electrode materials with interconnected network structures and paves the way for the broader application based on medium-entropy and high-entropy materials as promising candidates for future energy storage devices.