Core Shell Nanosheet Arrays Research Articles

Improved ZnWO4@NiCo2O4 core-shell nanosheet arrays with regulatory interfaces and electronic redistribution.

ZnWO4@NiCo2O4 core-shell nanosheet array composites are synthesized on nickel foam via a two-step hydrothermal method. The optimal conditions, including a Ni(NO3)2·6H2O to Co(NO3)2·6H2O molar ratio of 2 : 1, 12 hours reaction time, and 120 °C temperature, yield a specific capacitance of 875 C g-1 at 1 A g-1. The electrode also maintains 81.1% capacitance after 10 000 cycles. The material's performance is attributed to its core-shell structure, which enhances ion diffusion and electron transport. This study presents a viable approach for high-performance supercapacitor electrodes.

Ni0.85Se@CoFe LDH heterostructure nanosheet arrays on Ni foam as efficient electrocatalysts for enhanced oxygen evolution

Exploring high-efficient, earth-abundant and stable electrocatalyst for oxygen evolution reaction (OER) is of vital importance for large-scale implementation of energy converting and storing. Thus, we fabricated a free-standing hierarchical heterostructure electrode of Ni0.85Se@CoFe LDH/NF via a rational combination of hydrothermal, selenization and electrodeposition process, among which the ultrathin CoFe LDH nanosheets intimately assembled onto the vertical aligned Ni0.85Se nanosheets supported on Ni foam. The constructed core-shell nanosheet arrays hold the plentiful hetero-interfaces and intimate interactions through metal-oxygen bonds between two individuals, which guarantee the fast OER kinetic processes. Additionally, CoFe LDH with crystalline/amorphous hybrid structure favors providing more reaction sites. Remarkably, the optimal Ni0.85Se@CoFe LDH/NF binary composites possess outstanding OER activity with a low overpotential of ∼223 and 280 mV at 10 mA cm−2 and 100 mA cm−2 in alkaline solution as well as good durability. This research offers an alternative approach for improving electrocatalytic water splitting through constructing 3D hierarchical heterostructures.

Inhibitor and Activator: Dual Role of Subsurface Sulfide Enables Selective and Efficient Electro-Oxidation of Methanol to Formate on CuS@CuO Core-Shell Nanosheet Arrays.

Selective electro-oxidation of aliphatic alcohols into value-added carboxylates at lower potentials than that of the oxygen evolution reaction (OER) is an environmentally and economically desirable anode reaction for clean energy storage and conversion technologies. However, it is challenging to achieve both high selectivity and high activity of the catalysts for the electro-oxidation of alcohols, such as the methanol oxidation reaction (MOR). Herein, a monolithic CuS@CuO/copper-foam electrode for the MOR with superior catalytic activity and almost 100% selectivity for formate is reported. In the core-shell CuS@CuO nanosheet arrays, the surface CuO directly catalyzes MOR, while the subsurface sulfide not only serves as an inhibitor to attenuate the oxidative power of the surface CuO to achieve selective oxidation of methanol to formate and prevent over-oxidation of formate to CO2 but also serves as an activator to form more surface O defects as active sites and enhances the methanol adsorption and charge transfer to achieve superior catalytic activity. CuS@CuO/copper-foam electrodes can be prepared on a large scale by electro-oxidation of copper-foam at ambient conditions and can be readily utilized in clean energy technologies.

In situ preparation of hierarchical CuO@NiCo LDH core–shell nanosheet arrays on Cu foam for highly sensitive electrochemical glucose sensing

3D hierarchical core–shell nanostructures of CuO nanorods with NiCo LDH nanosheet arrays (CuO@NiCo LDH NSAs/CF) acting as electrodes have excellent sensing performance for glucose with a low detection limit of 0.16 μM at S/N = 3.

Self-supported loofah-like Co(OH)F@NiMn-LDH hierarchical core–shell nanosheet arrays as efficient electrocatalyst for hydrazine sensing

As a highly toxic substance that is harmful to the environment and human health, hydrazine (N2H4) has attracted more and more attention in the field of electrochemical detection. In this work, a loofah-like NiMn-LDH in situ grown on weed-like Co(OH)F with hierarchical core–shell nanosheet arrays structure on cloth (Co(OH)F@NiMn-LDH NSA/CC) was constructed by a simple two-step hydrothermal method combined with morphological regulation. Electrochemically reactive active sites with higher exposure, and a conductively stable 3D framework for barrier-free diffusion and transport of ions. As an efficient catalyst, the loofah-like Co(OH)F@NiMn-LDH NSA/CC have excellent electrochemical sensing performance at low operating potential (0.65 V) with sensitivity of 2850 μA mM−1 cm−2 and linear range of 2 × 10-3 mM to 7 mM, detection limit is 2.1 × 10-4 mM (S/N = 3). The sensor was successfully used to detect hydrazine in various environmental water samples, indicating that the electrocatalyst has excellent application prospects in electrochemical hydrazine sensors.

Synthesis of the sandwich-type MnMoO4@NiMoO4@Mn2O3 core-shell nanostructured materials and their application in the high-performance battery-supercapacitor hybrid devices

We synthesized the sandwich-type of MnMoO4@NiMoO4@Mn2O3 core-shell nanosheet arrays (MMNM) that were grown on nickel foams (NFs) via a two-step controllable hydrothermal reaction. Compared with the previously reported core-shell materials, the structure of MMNM series materials was more unique and abundant, and its application prospect was extremely broad. The electrochemical properties of the prepared electrodes were tested in a three-electrode system, among which the MMNM-2 electrode exhibited the best electrochemical performance. The battery-supercapacitor hybrid device (MMNM-2 //AC BSH device) fabricated with MMNM-2 and activated carbon (AC) as the positive electrode and the negative electrode, respectively, achieved a high energy density of 49.99 W h kg−1 at a power density of 877.87 W kg−1. Moreover, the MMNM-2//AC BSH device exhibited better cycling stability than most previously reported BSH devices, with a high capacity retention of 96.03% after 20,000 cycles at a current density of 10 mA cm−2. The excellent electrochemical performance indicated the potential application of MMNM-2 in new energy storage devices.

In-situ growth of hierarchical trifunctional Co4S3/Ni3S2@MoS2 core-shell nanosheet array on nickel foam for overall water splitting and supercapacitor

It is an enormous challenge to construct the cheap and effective multifunctional electrocatalysts for energy storage and conversion applications. Herein, a ZIF-67 derived Co4S3/Ni3S2@MoS2 core-shell nanosheet arrays were successfully developed on nickel foam via a simple two-step hydrothermal vulcanization method for electrocatalytic water splitting and supercapacitors. For overall water splitting, CNM 0.5 required the overpotentials of 96 and 269 mV at 10 mA cm−2 and 100 mA cm−2 for HER and OER in 1 M KOH. The dual-electrode electrolytic cell assembled from CNM 0.5 required only 1.447 V at 10 mA cm−2, and had nearly 100% Faraday efficiency and long-term stability (40 h). When used as the electrode for supercapacitors, CNM 0.5 had a large specific capacitance of 1238 F g−1 at 1 A g−1 current density and exceptional durability (85% retention after 2000 cycles). The ASC device assembled with CNM 0.5 provided the high-energy density of 41.2 W h kg−1 and long cycle-life (87% after 2000 cycles). The unique core-shell morphology with abundant active reactive edge sites would be beneficial for charge reduction and the volume shrinking/swelling during the rapid charge/discharge process. The well-ordered and vertically aligned nanosheet arrays possessed good conductivity and small interface resistance, which would facilitate the electron transfer and electrolyte penetration, ion insertion and de-intercalation.

Nickel cobalt sulfide coated iron nickel selenide hierarchical nanosheet arrays toward high-performance supercapacitors

Tailoring the electronic structure of nanomaterials by constructing core–shell heterostruture is a compelling strategy to design novel electrode materials with modified physiochemical properties for supercapacitors with improved performance. Herein, for the first time, we in situ fabricate iron nickel selenide (FeNiSe2)@nickel cobalt sulfide (Ni4.5Co4.5S8) core–shell nanosheet arrays on carbon cloth by an electrodeposition approach and a selenization treatment. This three-dimensional hierarchcial porous framework formed by plentiful interconnected nanosheets can expose numerous redox active sites with varied oxidation states and provide a conductive and porous skeleton for rapid ion/electrolyte ions transport. Benefiting from its modulated electronic structure and synergetic effect of metal-like FeNiSe2 and Ni4.5Co4.5S8, the as-synthesized FeNiSe2@Ni4.5Co4.5S8 electrode displays a large specific capacity of 236.9 mAh g−1 at 1 A g−1, remarkable rate capability with 80.6% capacity retention at 20 A g−1, and stable cyclic performance, which are superior to those of pure FeNiSe2 and Ni4.5Co4.5S8 electrodes. Besides, the assembled FeNiSe2@Ni4.5Co4.5S8//porous carbon hybrid supercapacitor device offers an energy density of 69.0 Wh kg−1 at 799.2 W kg−1, and exceptional cycling stability with 91.2% capacity retention after 10,000 cycles. This work offers a synthetic strategy to explore core–shell electrode materials with tunable architecture and morphology for high-performance energy storage devices.

Hierarchical FeCoSe2@NiCo-layered double hydroxide nanosheet arrays with boosted performance for hybrid supercapacitors

For constructing high-performance hybrid supercapacitor devices, it is vital to exploit a battery-type cathode with enhanced kinetics and improved cyclic performance to match with a capacitive anode. Herein, highly porous FeCoSe2@NiCo-LDH core-shell nanosheet arrays were in situ decorated on face of carbon cloth via an electrodeposition approach and a selenylation treatment. The hierarchical heterostructure consisting of two types of vertically aligned interconnected two-dimensional nanosheets not only offers huge surface area and available diffusion pathways for quick electron/ion transport, but also generates plentiful heterointerfaces with modified electronic structure and enables synergetic effect between dual components. Consequently, the well-designed FeCoSe2@NiCo-LDH electrode displays a greatly boosted specific capacity of 220.9 mA h g−1 at 1 A g−1, 83.5% capacity retention at 20 A g−1, and wonderful cyclic stability, which are superior to those of single component. Furthermore, the hybrid supercapacitor device with a FeCoSe2@NiCo-LDH electrode and a hierarchical porous carbon electrode illustrates an extensive energy density of 65.9 Wh kg−1 at 1.248 kW kg−1 combined with long lifetime with 87.6% capacity retention over 10,000 cycles. These superb properties manifest that the integrated FeCoSe2@NiCo-LDH electrode owns a desirable application prospect in hybrid energy storage systems.

Embellishing hierarchical 3D core-shell nanosheet arrays of ZnFe2O4@NiMoO4 onto rGO-Ni foam as a binder-free electrode for asymmetric supercapacitors with excellent electrochemical performance

Tailoring hierarchical hybrid core-shell electrodes with impartial microstructural features and excellent electroactive constituents is crucial for the design of high-performance supercapacitors (SCs). Herein, for the first time, we fabricate uniformly aligned porous ZnFe2O4 (ZFO) nanosheet arrays onto reduced graphene oxide-garnished conductive Ni foam (rGO-NF) substrates and subsequently embellish the first layer of ZFO nanosheets with morphology-controlled secondary NiMoO4 nanosheets to achieve a hierarchical 3D core-shell structure of ZnFe2O4@NiMoO4 nanosheet arrays (NSAs) onto rGO-NF for SC applications. Improving the synergistic effect of the core-shell nanoarchitecture with a conductive rGO-NF substrate, the hierarchical 3D ZFO@NMO NSAs tend to have superb electronic conductivity, tailoribility, effective nanoporous channels, and appropriate roadways for rapid ion/electron transfer, which are required for rapid reversible redox reactions, thus reflecting the excellent electrochemical features, including the excellent specific capacitance, good rate performance, and prolonged cyclic performance of the three electrode assemblies for SCs. An asymmetric supercapacitor (ASC) device composed of ZFO@NMO NSAs@rGO-NF as the cathode and MOF-derived hollow porous carbon (MDHPC) as the anode exhibits a high energy density of 58.6 Wh kg-1 at a power density of 799 W kg-1 with prolonged cyclic durability (89.6 % after 7000 cycles), thus indicating its potential applicability towards advanced hybrid SCs.

Synthesis of hierarchical Ni3S2@NiMoO4 core-shell nanosheet arrays on Ni foam for high-performance asymmetric supercapacitors

Hierarchical Ni3S2@NiMoO4 core-shell nanosheet arrays were directly fabricated on Ni foam through a simple two-step hydrothermal reaction followed by an annealing treatment. The shell, ultra-thin NiMoO4 nanosheets grew on the surface of the core, interconnected Ni3S2 nanosheet arrays. The growth density of the NiMoO4 nanosheets was adjusted by controlling the hydrothermal reaction time. When the hydrothermal time was 1 h, the as-prepared Ni3S2@NiMoO4 with a core-shell structure could achieve a high specific capacity up to 1121.4 C g−1 at a current density of 5 mA cm−2. In addition, the Ni3S2@NiMoO4 demonstrated 91.6% capacity retention of its initial value for 5000 cycles at a current density of 30 mA cm−2. Additionally, an asymmetric supercapacitor (ASC) device was assembled based on the optimized Ni3S2@NiMoO4 electrode as the positive electrode and activated carbon (AC) as the negative electrode. The ASC exhibited a maximum energy density of 28.4 W h kg−1 at a power density of 90.8 W kg−1, and showed a remarkable cycling performance with 93.1% retention of the initial capacitance after 10,000 cycles at a current density of 30 mA cm−2.

Reduced core-shell structured MnCo2O4@MnO2 nanosheet arrays with oxygen vacancies grown on Ni foam for enhanced-performance supercapacitors

In this work, reduced core-shell structured MnCo2O4@MnO2 (rMnCo2O4@rMnO2) nanosheet arrays with appropriate oxygen vacancies grown on Ni foam have been prepared via a two-step hydrothermal process with facile annealing and NaBH4 solution treatment. The good designs of 2D-2D MnCo2O4@MnO2 core-shell nanosheet arrays and in situ introduce of oxygen vacancies provide abundant reactive sites and effective electronic transmission, endowing the rMnCo2O4@rMnO2 an excellent electrochemical performance. And the rMnCo2O4@rMnO2-2h electrode exhibits an aerial capacitance of 3.39 F cm−2 (or 0.4 mA h cm−2) at the current density of 3 mA cm−2, much higher than those of MnCo2O4 (1.27 F cm−2, or 0.15 mA h cm−2) and MnCo2O4@MnO2 (1.89 F cm−2, or 0.22 mA h cm−2). Also, the electrode possesses pretty rate performance of 1.66 F cm−2 (or 0.19 mA h cm−2) at 60 mA cm−2 and cycling property with 92.5% capacity retention after 3000 cycles. Furthermore, the assembled rMnCo2O4@rMnO2-2h//AC asymmetric supercapacitor yields an energy density of 32.4 W h kg−1 at a power density of 904.9 W kg−1, 27.3 W h kg−1 even at 4524.2 W kg−1 and maintains 81.8% of initial capacitance at 50 mA cm−2 after 5000 cycles, which indicate the rMnCo2O4@MnO2-2h should be applicable electrode materials for supercapacitors.

A high-performance electrode based on the ZnCo2O4@CoMoO4 core-shell nanosheet arrays on nickel foam and their application in battery-supercapacitor hybrid device

Hierarchical ZnCo2O4@CoMoO4 core-shell nanosheet arrays (ZCCM) were synthesized by coating CoMoO4 nanosheets on the ZnCo2O4 nanosheets on nickel foam (NF) via a facile two-step hydrothermal method, followed by a calcination process. The electrochemical properties of the prepared electrodes were characterized in a three-electrode system as the working electrode. The ZCCM electrode is able to deliver extraordinary specific capacity as high as 1096.08 C g−1 at the current density of 10 mA cm−2, and exhibits excellent cycling stability with the specific capacity of 104.1% initial value after 5000 charge/discharge cycles. A battery-supercapacitor hybrid (BSH) device was then assembled using the ZCCM electrode as the positive electrode, activated carbon (AC) as the negative electrode, and 2 M KOH as the electrolyte, and its performance was evaluated. The device outputs the high energy density of 29.24 W h kg−1 at the power density of 884.57 W kg−1 and 20.76 W h kg−1 at the power density of 10526.32 W kg−1 and shows outstanding cycling stability with 90.95% retention of its initial capacitance after 5000 cycles at the current density of 10 mA cm−2.

Facile Synthesis of Hierarchical MgCo2O4@MnO2 Core-Shell Nanosheet Arrays on Nickel Foam as an Advanced Electrode for Asymmetric Supercapacitors

Ternary transition metal oxides (TTMOs) material has recently drawn significant interests to researchers, as a potential electrode material to advance the energy storage technology. In this paper, the hierarchical MgCo2O4@MnO2 core-shell nanosheet arrays (CNAs) were resoundingly fabricated on nickel foam using a simple solvothermal reaction and a calcination afterwards. The assembled MgCo2O4@MnO2 electrode had a specific capacity of 968.98 C g−1 under 1 mA cm−2 in a 1 M KOH solution. Additionally, two asymmetric supercapacitors (ASCs) were assembled, one with PVA-KOH gel (PKG) as electrolyte and the other with KOH solution as electrolyte. Both of the ASCs were made with MgCo2O4@MnO2 CNAs/Ni foam as the positive electrode and the activated carbon (AC) as the negative electrode, and both exhibited extraordinary electrochemical properties. The remarkable electrochemical performance revealed that the MgCo2O4@MnO2 nanomaterial was a prospective electrode material and can be applied potentially in energy storage field.

Designed cross-linking nanoporous Zn0.76Co0.24S @C-ZIF-Zn0.76Co0.24S core-shell nanosheet arrays on nickle foam for battery-type electrodes with high performance electrochemical energy storage

Ternary metal sulfide as a novel electrode material in energy storage receives tremendous attention, but there are few reports about zinc cobalt sulfide as eletrode material for electrochemical energy storage devices. However, the problem of structural collapse for the zinc cobalt sulfide caused by severe volume change restrict its cycling stability and rate capability. For solving the problem, a new type structure of metal–organic frameworks (MOFs)-derived nanoporous Zn0.76Co0.24S nanoparticles with a carbon layer perfectly decorated on a Zn0.76Co0.24S nanosheet arrays is raised. Benefiting from the core–shell structure and the carbon derived from MOFs, the Zn0.76Co0.24S@C-ZIF-Zn0.76Co0.24S core-shell nanosheet arrays (Zn0.76Co0.24S CSNSAs) electrode has a high specific capacity (1202 C g−1 at 1 A g−1), good rate capability and cycling stability (92% capacity retention after 5000 cycles at 10 A g−1). What’s more, the energy storage device assembled with Zn0.76Co0.24S CSNSAs achieves superior energy density (79.2 Wh kg−1 at 625 W kg−1), exhibiting excellent cycling stability (97% over 2000 cycles). Compared to pristine Zn0.76Co0.24S, the new type structure electrode exhibits a significantly enhanced charge storage property. With a novel synthesis and the outstanding electrochemical properties, this creative design renders Zn0.76Co0.24S CSNSAs a promising anode material for advanced energy storages.

Hierarchical Ni2P@NiFeAlO x Nanosheet Arrays as Bifunctional Catalysts for Superior Overall Water Splitting.

Bifunctional electrocatalysts based on transition-metal phosphides are appealing for overall water splitting owing to their excellent electrical conductivity, low cost, and high stability. However, these specials are often restricted by some serious drawbacks such as its relatively poor activity for oxygen evolution reaction (OER) and its manufacture, which usually requires one to add additional large numbers of P sources and, consequently, inevitably leads to the release of flammable and detrimental PH3. Herein, we show an effective avenue to overcome these issues. For the first time, the in situ topological transformation of PO43--intercalated NiFeAl-layered double hydroxide nanosheet arrays upon calcination under a H2 atmosphere is developed to fabricate supported nickel phosphide without any additional P source. The resulting phase affords unique Ni2P@NiFeAlO x core-shell nanosheet arrays, which exhibit an excellent performance for OER and hydrogen evolution reaction in 1.0 M KOH, with low overpotentials of 210 and 105 mV at 10 mA cm-2, respectively. Impressively, it can also serve as both a cathode and an anode to drive water splitting in alkaline media, giving 10 and 100 mA cm-2 at cell voltages of only 1.52 and 1.62 V, respectively. This value is better than the commercial criterion of the Pt/C//IrO2 counterpart and also ranks at the top level in all established bifunctional electrocatalysts. The outstanding performance of Ni2P@NiFeAlO x is mainly attributed to the synergistic effect from a highly dispersed Ni2P core and a thin NiFeAlO x shell, as well as the efficient mass transport of a hierarchical nanoarray framework.

Constructing metallic zinc–cobalt sulfide hierarchical core–shell nanosheet arrays derived from 2D metal–organic-frameworks for flexible asymmetric supercapacitors with ultrahigh specific capacitance and performance

Electrode materials of flexible asymmetric supercapacitors are usually suffers from low capacitance and sluggish kinetics.

Metal-Organic Framework Templated 3D Hierarchical ZnCo2 O4 @Ni(OH)2 Core-Shell Nanosheet Arrays for High-Performance Supercapacitors.

Designing core-shell electrode materials with desired components and architectures is a promising strategy for boosting electrochemical performance. Here, three-dimensional hierarchical ZnCo2 O4 @Ni(OH)2 core-shell nanosheet arrays have been successfully fabricated on a Ni foam substrate, in which the porous ZnCo2 O4 nanosheet "core" as the conductive scaffold was synthesized by a metal-organic framework (MOF)-templated method, and the ultrathin Ni(OH)2 nanoflakes "shell" with rich active sites were grafted on the ZnCo2 O4 nanosheet through a hydrothermal treatment. When directly used as a free-standing electrode for supercapacitor, these hierarchical ZnCo2 O4 @Ni(OH)2 core-shell nanosheet arrays exhibited a high capacitance of 3063.2 mF cm-2 (1021.1 F g-1 ) at the current density of 1 mA cm-2 . This electrode significantly outperformed individual Ni(OH)2 or ZnCo2 O4 nanosheet arrays, benefiting from the robust core-shell arrays on Ni foam with good electrical conductivity and abundant active sites, as well as the synergetic effect between MOF-derived porous ZnCo2 O4 "core" and the ultrathin Ni(OH)2 "shell". Moreover, the assembled ZnCo2 O4 @Ni(OH)2 //activated-carbon asymmetric supercapacitor displayed excellent energy and power densities (maximum of 40.0 Wh kg-1 and 8.02 kW kg-1 ) and superior cycling stability of 98.4 % retention with 91.2 % coulombic efficiency over 5 000 cycles at 10 A g-1 .

On-Chip Growth of SnO2/ZnO Core–Shell Nanosheet Arrays for Ethanol Detection

In this letter, well-defined SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /ZnO core-shell nanosheet arrays (NSAs) are grown with an on-chip two-step process as gas sensing materials. A homogeneous precipitation method has been used to synthesize SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> NSAs, following by atomic layer deposition of ZnO. The SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /ZnO core-shell NSAs based sensor exhibits significantly enhanced ethanol sensing response (13.3 at 100 ppm) and selectivity at 350 °C, as compared with the pure SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> NSAs (2.7 at 100 ppm). The improvement of sensor performance can be ascribed to the SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /ZnO heterostructures formed in the core-shell NSAs, which suggests the promising application for MEMS compatible ethanol sensors.

Construction of hierarchical zinc cobalt sulfide@nickel sulfide core-shell nanosheet arrays for high-performance asymmetric solid-state supercapacitors

To fulfill the promise of high-performance supercapacitors (SCs) with a high specific capacitance, superior rate capability, long cycling life, and high energy density, it is desirable to rationally construct core-shell composite electrode materials with tailored architectures and components. In this reported study, hierarchical Zn0.76Co0.24S@Ni3S2 core-shell nanosheet arrays (CSNAs) on Ni foam are designed and synthesized, in which interconnected Zn0.76Co0.24S nanosheet cores are initially constructed through a hydrothermal reaction combined with a sulfurization process. These nanosheet cores are then uniformly wrapped by a Ni3S2 nanosheet shell using an electrochemical deposition reaction. The hierarchical structure of nanosheets@nanosheets together with the synergistic effect between the Zn0.76Co0.24S and Ni3S2 components, enables the composite electrode to exhibit a large specific capacity (1209 C g−1 at 2 A g−1), good rate capability (78.6% capacity retention at 20 A g−1), and remarkable cycle stability (94.9 capacity retention after 5000 cycles at 20 A g−1). Furthermore, the fabricated Zn0.76Co0.24S@Ni3S2//active carbon (AC) asymmetric solid-state supercapacitor cell (ASSC) can deliver a high energy density of 53.8 W h kg−1 at a power density of 853 W kg−1. These results showcase the great application potential of the novel core-shell composite electrode in high-performance SCs, and they also provide an alternative method for constructing metal sulfide-based composite electrodes with optimum electrochemical performance.