Spinel-type bimetal sulfides derived from Prussian blue analogues as efficient polysulfides mediators for lithium−sulfur batteries

More and more attentions have been attracted by lithium-sulfur batteries (Li-S), owing to the high energy density for the increasingly advanced energy storage system. While the poor cycling stability, due to the inherent polysulfide shuttle, seriously hampered their practical application. Recently, some polar hosts, like single metal oxides and sulfides, have been employed as hosts to interact with polysulfide intermediates. However, due to the inherent poor electrical conductivity of these polar hosts, a relatively low specific capacity is obtained. Herein, a spinel-type bimetal sulfide NiCo₂S₄ through a Prussian blue analogue derived methodology is reported as the novel host of polysulfide, which enables high-performance sulfur cathode with high Coulombic efficiency and low capacity decay. Notably, the Li-S battery with NiCo₂S₄-S composites cathode still maintains a capacity of 667 mAh/g at 0.5 C after 300 cycles, and 399 mAh/g at 1 C after 300 cycles. Even after 300 cycles at the current density of 0.5 C, the capacity decays by 0.138% per cycle at high sulfur loading about 3 mg/cm². And the capacity decays by 0.026% per cycle after 1000 cycles, when the rate is 1 C. More importantly, the cathode of NiCo₂S₄-S composite shows the outstanding discharge capacity, owing to its good conduction, high catalytic ability and the strong confinement of polysulfides.     

Construction of porous NiCo2S4@CeO2 microspheres composites for high-performance pseudocapacitor electrode by morphology reshaping

NiCo₂S₄ microspheres consisting of nanoparticles were synthesized by a simple hydrothermal process, and then NiCo₂S₄@CeO₂ microspheres consisting of nanosheets or nanoneedles-like structures were constructed by a morphology reshaping process for the first time. The introduction of CeO₂ changes the nanoparticle morphology of NiCo₂S₄, and forms incompact nanosheet and nanoneedle structures. The porous, incompact nanosheet or nanoneedle structures with enhanced specific surface areas not only accelerate the charge transfer but also facilitate the electrolyte diffusion and provide more active sites for the redox reactions. These merits endow outstanding electrochemical performances to NiCo₂S₄@CeO₂ microspheres when used as electrode materials for electrochemical pseudocapacitor. Especially, NiCo₂S₄@CeO₂ (6 wt%) microspheres consisted of nanosheets show a high specific capacitance of 1263.6 F g^?1 with a retention rate of 81.1% at 20 A g^?1 after 10,000 cycles. Nonetheless, pristine NiCo₂S₄ microspheres consisted of nanoparticles only show a high specific capacitance of 555.2 F g^?1 with a retention rate of 63.5% at the same conditions. The first-principles calculation shows that the strong interactions between the NiCo₂S₄ and CeO₂ are favorable for the stabilization of the composite, being responsible for its good cycling performance. The result shows that the NiCo₂S₄@CeO₂ microspheres are promising electrode materials for high-performance pseudocapacitor, and morphology reshaping and CeO₂ modification are efficient ways to construct high-performance pseudocapacitor.     

All-solid-state flexible asymmetric supercapacitors with high energy and power densities based on NiCo_2S_4@MnS and active carbon

Electrode material based on a novel core–shell structure consisting of NiCo_2S_4(NCS) solid fiber core and Mn S(MS) sheet shell(NCS@MS) in situ grown on carbon cloth(CC) has been successfully prepared by a simple sulfurization-assisted hydrothermal method for high performance supercapacitor. The synthesized NiCo_2S_4@Mn S/CC electrode shows high capacitance of 1908.3 F g~(-1) at a current density of 0.5 A g~(-1) which is higher than those of NiCo_2S_4 and Mn S at the same current density. A flexible all-solid-state asymmetric supercapacitor(ASC) is constructed by using NiCo_2S_4@Mn S/CC as positive electrode, active carbon/CC as negative electrode and KOH/poly(vinyl alcohol)(PVA) as electrolyte. The optimized ASC shows a maximum energy density of 23.3 Wh kg~(-1) at 1 A g~(-1), a maximum power density of about7.5 kw kg~(-1) at 10 A g~(-1) and remarkable cycling stability. After 9000 cycles, the ASC still exhibited67.8% retention rate and largely unchanged charge/discharge curves. The excellent electrochemical properties are resulted from the novel core–shell structure of the NiCo_2S_4@Mn S/CC electrode, which possesses both high surface area for Faraday redox reaction and superior kinetics of charge transport. The NiCo_2S_4@Mn S/CC electrode shows a promising potential for energy storage applications in the future.     

Hierarchical NiCo2S4 Nanotube@NiCo2S4 Nanosheet Arrays on Ni Foam for High‐Performance Supercapacitors

Hierarchical NiCo₂S₄ nanotube@NiCo₂S₄ nanosheet arrays on Ni foam have been successfully synthesized. Owing to the unique hierarchical structure, enhanced capacitive performance can be attained. A specific capacitance up to 4.38 F cm^?2 is attained at 5 mA cm^?2, which is much higher than the specific capacitance values of NiCo₂O₄ nanosheet arrays, NiCo₂S₄ nanosheet arrays and NiCo₂S₄ nanotube arrays on Ni foam. The hierarchical NiCo₂S₄ nanostructure shows superior cycling stability; after 5000 cycles, the specific capacitance still maintains 3.5 F cm^?2. In addition, through the morphology and crystal structure measurement after cycling stability test, it is found that the NiCo₂S₄ electroactive materials are gradually corroded; however, the NiCo₂S₄ phase can still be well‐maintained. Our results show that hierarchical NiCo₂S₄ nanostructures are suitable electroactive materials for high performance supercapacitors.     

ZIFs骨架型双壳层纳米笼状CoS/NiCo2S4的制备及其电化学性能

采用离子刻蚀和化学气相沉积法制备出具有沸石咪唑酯骨架(ZIFs)型双壳层纳米笼状的CoS/NiCo_2S_4并组装成超级电容器。该结构有较大的比表面积(98 m2·g-1),合适的孔道(孔径4 nm),且保留了ZIFs骨架构型。作为电极活性材料时,具有良好的结构稳定性和电化学活性,有利于增强所组装的超级电容器的循环稳定性和比容量。在三电极体系中,在1 A·g-1的电流密度下,容量为1 230 F·g-1;在3 A·g-1电流密度下循环9 000圈后,初始电容保持率为76.6%。在以该电极、活性炭电极与KOH/聚乙烯醇(PVA)凝胶态电解质组装的器件中,当功率密度为702 W·kg-1时,能量密度达31.6 Wh·kg-1;在7 056 W·kg-1的高功率密度下,仍保持16.5 Wh·kg-1的能量密度。     

Co9S8@CN Composites Obtained from Thiacalix[4]arene-Based Coordination Polymers for Supercapacitor Applications

Metal sulfides have been recognized as promising electrodes for electrochemical energy storage owing to their remarkable electrochemical properties. Here, we demonstrate the preparation of Co₉S₈ nanoparticles anchored on a carbon matrix (denoted as Co₉S₈-X@CN (X=1, 2)) from precursor sources, two 1D infinite coordination polymers 1 and 2 . The two polymers were assembled by linking Co₄-TC4A secondary building blocks (SBUs) with ligands L₁ and L₂, respectively (H₄TC4A=p-tert-butylthiacalix[4]arene, L₁=1,4-bis(2H-tetrazol-5-yl)benzene, L₂=1,3-bis(2H-tetrazol-5-yl)benzene). The composites obtained from 1D polymers showed different morphologies, that is, the Co₉S₈ nanoparticles of Co₉S₈-1@CN are octahedral with a size of ca. 140 nm, while the lamellar Co₉S₈ nanoparticles in Co₉S₈-2@CN possess different sizes (50–150 nm). The Co₉S₈-2@CN immobilized on nickel foam (Co₉S₈-2@CN/NF) show better supercapacitive performance than that of Co₉S₈-1@CN. Co₉S₈-2@CN showed exceptionally high activities, combining higher specific capacitances (445.2 F g⁻¹ at 2 A g⁻¹ and 393.9 F g⁻¹ and 5 A g⁻¹), rate capacity (94.5% retention at 2 A g⁻¹), and long-term stability (79.2% retention at 5 A g⁻¹ over 1000 cycles). The smaller size and larger BET surface area of Co₉S₈-2@CN nanoparticles can improve the electrical conductivity and provide facile pathways for charge transport, thus leading to conspicuous electrochemical performance of Co₉S₈-2@CN compared with its Co₉S₈-1@CN counterpart.     

Hierarchical Nanotubes Constructed by Co9S8/MoS2 Ultrathin Nanosheets Wrapped with Reduced Graphene Oxide for Advanced Lithium Storage

Nanostructured hybrid metal sulfides have attracted intensive attention due to their fascinating properties that are unattainable by the single‐phased counterpart. Herein, we report an efficient approach to construct cobalt sulfide/molybdenum disulfide (Co₉S₈/MoS₂) wrapped with reduced graphene oxide (rGO). The unique structures constructed by ultrathin nanosheets and synergetic effects benefitting from bimetallic sulfides provide improved lithium ions reaction kinetics, and they retain good structural integrity. Interestingly, the conductive rGO can facilitate electron transfer, increase the electronic conductivity and accommodate the strain during cycling. When evaluated as anode materials for lithium‐ion batteries (LIBs), the resultant reduced graphene oxide‐coated cobalt sulfide/molybdenum disulfide (Co₉S₈/MoS₂@rGO) nanotubes deliver high specific capacities of 1140, 948, 897, 852, 820, 798 and 784 mAh g^?1 at the various discharging current densities of 0.2, 0.5, 1, 2, 3, 4 and 5 A g^?1, respectively. In addition, they can maintain an excellent cycle stability with a discharge capacity of 807 mAh g^?1 at 0.2 A g^?1 after 70 cycles, 787 mAh g^?1 at 1 A g^?1 after 180 cycles and 541 mAh g^?1 at 2 A g^?1 after 200 cycles. The proposed method may offer fundamental understanding for the rational design of other hybrid functional composites with high Li‐storage properties.     

Bimetallic CoNiSe2/C nanosphere anodes derived from Ni-Co-metal-organic framework precursor towards higher lithium storage capacity

Through uncomplicated carbonation process, a carbon-embedded CoNiSe₂/C nanosphere was synthesized from Ni-Co-MOF (metal-organic framework) precursor whose controllable structure and synergistic effect of bimetallic Ni/Co brought CoNiSe₂/C anodes with high specific surface area (172.79 m²/g) and outstanding electrochemical performance. CoNiSe₂/C anodes obtained reversible discharge capacities of 850.9 mAh/g at 0.1 A/g after cycling for 100 cycles. In addition, CoNiSe₂/C exhibits excellent cycle stability and reversibility in the rate test at a current density of 0.1–2.0 A/g. When the current density returns to 0.5 A/g for 150 cycles, its discharge ratio the capacity is 330.8 mAh/g. Electrochemical impedance spectroscopy (EIS) tests suggested that CoNiSe₂/C anodes had a lower charge transfer impedance of 130.02 Ω after 30 cycles. In-situ X-ray diffraction (XRD) tests confirmed the alloying mechanism of CoNiSe₂/C which realized higher lithium storage capacity. This work affords substantial evidence for the extension of bimetallic selenides in secondary batteries, promoting the development of bimetallic selenides in anode materials for LIBs.     

Hollow 3D Frame Structure Modified with NiCo2S4 Nanosheets and Spinous Fe2O3 Nanowires as Electrode Materials for High-Performance All-Solid-State Asymmetric Supercapacitors

Supercapacitors have attracted tremendous research interest, since they are expected to achieve battery-level energy density, while having a long calendar life and short charging time. Herein, a novel asymmetric supercapacitor has been successfully assembled from NiCo₂S₄ nanosheets and spinous Fe₂O₃ nanowire modified hollow melamine foam decorated with polypyrrole as positive and negative electrodes, respectively. Owing to the well-designed nanostructure and suitable matching of electrode materials, the assembled asymmetric supercapacitor (ASC) exhibits an extended operation voltage window of 1.6 V with an energy density of 20.1 Wh kg⁻¹ at a power density of 159.4 kW kg⁻¹. Moreover, the ASC shows stable cycling stability, with 81.3 % retention after 4000 cycles and a low internal resistance of 1.03 Ω. Additionally, a 2.5 V light-emitting diode indicator can be lit up by three ASCs connected in series; this provides evidence of the practical application potential of the assembled energy-storage system. The excellent electrochemical performances should be credited to the significant enhancement of the specific surface area, charge transport, and mechanical stability resulting from the unique 3D morphology.     

Co2P/Sn4P3 particle encapsulated in N,P codoped carbon nanocubes for efficient sodium storage

Phosphorus-based materials as the anode for sodium-ion batteries have drawn extensive attention because of their high theoretical capacity and low insertion potential. Nevertheless, the severe volume variation and low electric conductivity hindered their further practical applications. Herein, a novel Co₂P/Sn₄P₃ hybrid encapsulated in carbon nanocubes was fabricated by a coprecipitation method followed by phosphating progress. Accompanying with the N, P codoping and abundant grain boundaries, which facilitates electric transport and provides rich active sites, the as-synthesized Co₂P/Sn₄P₃@C anode delivered a high charge specific capacity of 185.6 mA h g^?1 after 400 cycles at the current density of 1000 mA g^?1 and outstanding cycling stability with a high capacity retention of 86.9%. Kinetics exploration indicated that the capacity was governed by the surface pseudo-capacitive controlled process due to the abundant defects originated from heteroatom doping and grain boundaries.     

锂离子电池片状四氧化三钴负极的合成及改性

采用液相沉淀法结合低温固相热解法合成了锂离子电池片状Co3O4负极.通过X射线粉体衍射(XRD)、Brunauer-Emmett-Teller(BET)比表面积分析、扫描电子显微镜(SEM)及恒电流充放电等表征手段,发现该Co3O4为立方相,结晶完整且无杂质,由直径为1.5-3.0μm、厚度约为100-300 nm的不规则片状颗粒组成,比表面积约为30.5 m2·g-1;其比容量高且容量保持率好,在0.1C倍率下,首次放电容量高达1444.5 mAh·g-1,50次循环后充电容量仍大于1100.0 mAh·g-1;但在高倍率(1C)下,50次循环后充电容量保持率仅为75.3%,倍率性能一般.故采用碳纳米管(CNTs)掺杂改性,结果表明:在1C倍率下,70次循环后复合材料充电容量保持率为96.3%;在2C倍率下,50次循环后充电容量保持率仍高达97.0%,倍率性能显著提升.     

Enhanced Supercapacitor Performance Using a Co3O4@Co3S4 Nanocomposite on Reduced Graphene Oxide/Ni Foam Electrodes

To avoid an enormous energy crisis in the not-too-distant future, it be emergent to establish high-performance energy storage devices such as supercapacitors. For this purpose, a three-dimensional (3D) heterostructure of Co₃O₄ and Co₃S₄ on nickel foam (NF) that is covered by reduced graphene oxide (rGO) has been prepared by following a facile multistep method. At first, rGO nanosheets are deposited on NF under mild hydrothermal conditions to increase the surface area. Subsequently, nanowalls of cobalt oxide are electro-deposited on rGO/Ni foam by applying cyclic-voltammetry (CV) under optimized conditions. Finally, for the synthesis of Co₃O₄@Co₃S₄ nanocomposite, the nanostructure of Co₃S₄ was fabricated from Co₃O₄ nanowalls on rGO/NF by following an ordinary hydrothermal process through the sulfurization for the electrochemical application. The samples are characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The obtained sample delivers a high capacitance of 13.34 F cm⁻² (5651.24 F g⁻¹) at a current density of 6 mA cm⁻² compared to the Co₃O₄/rGO/NF electrode with a capacitance of 3.06 F cm⁻² (1230.77 F g⁻¹) at the same current density. The proposed electrode illustrates the superior electrochemical performance such as excellent specific energy density of 85.68 W h Kg⁻¹, specific power density of 6048.03 W kg⁻¹ and a superior cycling performance (86% after 1000 charge/discharge cycles at a scan rate of 5 mV s⁻¹). Finally, by using Co₃O₄ @Co₃S₄/rGO/NF and the activated carbon-based electrode as positive and negative electrodes, respectively, an asymmetric supercapacitor (ASC) device was assembled. The fabricated ASC provides an appropriate specific capacitance of 79.15 mF cm⁻² at the applied current density of 1 mA cm⁻², and delivered an energy density of 0.143 Wh kg⁻¹ at the power density of 5.42 W kg⁻¹.     

Enhanced Electrocatalytic Water Oxidation by Interfacial Phase Transition and Photothermal Effect in Multiply Heterostructured Co9S8/Co3S4/Cu2S Nanohybrids

The rational design of advanced nanohybrids (NHs) with optimized interface electronic environment and rapid reaction kinetics is pivotal to electrocatalytic schedule. Herein, we developed a multiple heterogeneous Co₉S₈/Co₃S₄/Cu₂S nanoparticle in which Co₃S₄ germinates between Co₉S₈ and Cu₂S. Using high-angle annular-dark-field imaging and theoretical calculation, it was found that the integration of Co₉S₈ and Cu₂S tends to trigger the interface phase transition of Co₉S₈, leading to Co₃S₄ interlayer due to the low formation energy of Co₃S₄/Cu₂S (−7.61 eV) than Co₉S₈/Cu₂S (−5.86 eV). Such phase transition not only lowers the energy barrier of oxygen evolution reaction (OER, from 0.335 eV to 0.297 eV), but also increases charge carrier density (from 7.76×10¹⁴ to 2.09×10¹⁵ cm⁻³), and creates more active sites. Compared to Co₉S₈ and Cu₂S, the Co₉S₈/Co₃S₄/Cu₂S NHs also demonstrate notable photothermal effect that can heat the catalyst locally, offset the endothermic enthalpy change of OER, and promote carrier migrate, reaction intermediates adsorption/deprotonation to improve reaction kinetics. Profiting from these favorable factors, the Co₉S₈/Co₃S₄/Cu₂S catalyst only requires an OER overpotential of 181 mV and overall water splitting cell voltage of 1.43 V to driven 10 mA cm⁻² under the irradiation of near-infrared light, outperforming those without light irradiation and many reported Co-based catalysts.     

Hollow Co9S8 from metal organic framework supported on rGO as electrode material for highly stable supercapacitors

We demonstrate a hydrothermal method to fabricate a composite of reduced graphene oxide (rGO) with hollow Co₉S₈ derived from metal organic framework (MOF), which exhibits a high specific capacitance of 575.9 F/g at 2 A/g and 92.0% capacitance retention after 9000 cycles.     

GO/ZIF-67模板制备rGO/NiCo2S4及高性能不对称超级电容器

以氧化石墨烯(GO)为基底,在GO表面原位生长ZIF-67并作为模板,经硝酸镍刻蚀、碳化、水热硫化制得rGO/NiCo_2S_4复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)表征复合材料的结构与形貌。随后将rGO/NiCo_2S_4复合材料制成正极材料,测试其电化学性能,测试结果显示:rGO/NiCo_2S_4-1.5 h电极材料在1 A·g~(-1)的电流密度下,其比电容值高达1 577 F·g~(-1),当电流密度达到10 A·g~(-1)时,倍率性能为86.4%,在10 A·g~(-1)的电流密度下循环2 000次后,电容保持率为76.9%。另外,在6 mol·L-1KOH电解液中,由AC//rGO/NiCo_2S_4-1.5 h组成的不对称电容器在功率密度为723 W·kg~(-1)时,能量密度为33 Wh·kg~(-1);在高功率密度为7 277 W·kg~(-1)时,能量密度仍保持为23 Wh·kg~(-1)。     

Synergetic ternary metal oxide nanodots-graphene cathode for high performance zinc energy storage

Zinc-based electrochemistry energy storage with high safety and high theoretical capacity is considered to be a competitive candidate to replace lithium-ion batteries. In electrochemical energy storage, multi-metal oxide cathode materials can generally provide a wider electrochemical stability window and a higher capacity compared with single metal oxides cathode. Here, a new type of cathode material, MnFe₂Co₃O₈ nanodots/functional graphene sheets, is designed and used for aqueous hybrid Zn-based energy storage. Coupling with a hybrid electrolyte based on zinc sulfate and potassium hydroxide, the as-fabricated battery was able to work with a wide electrochemical window of 0.1∼1.8 V, showed a high specific capacity of 660 mAh/g, delivered an ultrahigh energy density of 1135 Wh/kg and a scalable power density of 5754 W/kg (calculated based on the cathode), and displayed a long cycling life of 1000 cycles. These are mainly attributed to the valence charge density distribution in MnFe₂Co₃O₈ nanodots, the good structural strengthening as well as high conductivity of the cathode, and the right electrolyte. Such cathode material also exhibited high electrocatalytic activity for oxygen evolution reaction and thus could be used for constructing a Zn-air battery with an ultrahigh reversible capacity of 9556 mAh/g.     

Hierarchical FeCo2S4@FeNi2S4 Core/Shell Nanostructures on Ni Foam for High-Performance Supercapacitors

The design of electrode materials with rational core/shell structures is promising for improving the electrochemical properties of supercapacitors. Hence, hierarchical FeCo₂S₄@FeNi₂S₄ core/shell nanostructures on Ni foam were fabricated by a simple hydrothermal method. Owing to their structure and synergistic effect, they deliver an excellent specific capacitance of 2393 F g⁻¹ at 1 A g⁻¹ and long cycle lifespan as positive electrode materials. An asymmetric supercapacitor device with FeCo₂S₄@FeNi₂S₄ as positive electrode and graphene as negative electrode exhibited a specific capacitance of 133.2 F g⁻¹ at 1 A g⁻¹ and a high energy density of 47.37 W h kg⁻¹ at a power density of 800 W kg⁻¹. Moreover, the device showed remarkable cycling stability with 87.0 % specific-capacitance retention after 5000 cycles at 2 A g⁻¹. These results demonstrate that the hierarchical FeCo₂S₄@FeNi₂S₄ core/shell structures have great potential in the field of electrochemical energy storage.     

Synthesis of porous biocarbon supported Ni3S4/CeO2 nanocomposite as high-efficient electrode materials for asymmetric supercapacitors

Biocarbon-supported polymetallic composites (CAS@Ni₃S₄/CeO₂) were fabricated by a facile hydrothermal process. The as-prepared CAS@Ni₃S₄/CeO₂ materials integrated the advantages of transition metal sulfides (good conductivity), rare-earth metal oxides (excellent stability), as well as porous carbon with high surface area, thus exhibiting promising electrochemical performance in supercapacitor applications. Indeed, the optimal CAS@Ni₃S₄/CeO₂-150 composite displayed a high specific capacitance of 1364 F g^?1 and impressive cycle performance with capacitance retention of 93.81 % after 10,000 cycles. The calculation of capacitance contribution showed that the satisfying behavior of the electrode was a combination of the diffusion process and the surface capacitance characteristics. Furthermore, the assembled asymmetric supercapacitor (CAS@Ni₃S₄/CeO₂-150//CAS) delivered an ultrahigh energy density of 102.76 Wh kg^?1, which was better than that of the commercial activated carbon-based ASC device. This novel strategy might provide a new perspective for transition metal sulfide/rare earth metal oxide composite in the electrochemical energy storage field.     

Multi-stage Ordered Mesoporous Carbon-graphene Aerogel-Ni3S2/Co4S3 for Supercapacitor Electrode

Transition metal sulfides have emerged as promising materials in supercapacitor. In this work, we firstly developed an interface-induced superassembly approach to fabricate NiS_x and CoS_x nanoparticles, which based on ordered mesoporous carbon-graphene aerogel composites for supercapacitor electrodes. The obtained multi-component superassembled nanoparticles-carbon matrix composites have controllable 3D porous structure of multi-stage composite. The two-dimensional graphene interlaced to form a 3D framework with large sponge-like pores, and then the graphene surface was loaded with mesoporous carbon with mesoporous pore size and vertical orientation. The composites display high specific capacitance of 958.1 F g⁻¹ at 0.1 A g⁻¹. The capacitance retains about 97.3 % after 3000 charging-discharging cycles at 2 A g⁻¹. These results indicate that the obtained OMC−GA−Ni₃S₂/Co₄S₃ is a promising material for electrochemical capacitors, which providing new technical methods and ideas for the research of new energy and analytical sensor materials in the fields of energy storage, photocatalysis, point-of-care testing devices and other fields.     

ZIF-67 derived hollow Ni-Co-Se nano-polyhedrons for flexible hybrid supercapacitors with remarkable electrochemical performances

Nano-polyhedral NiSe₂/CoSe₂ (Ni-Co-Se) with hollow architectures are synthesized by selenizing the precursors of Ni-Co bimetallic hydroxides that are directly derived from ZIF-67. The as-fabricated Ni-Co-Se electrodes exhibit high specific capacitance of 1668 F/g at 1 A/g accompanying with outstanding rate capability (about 82.8% retention of the initial capacity at 20 A/g). The corresponding Ni-Co-Se//AC all-solid-state hybrid supercapacitors are assembled by directly using the Ni-Co-Se on carbon fabric as the positive electrode, which deliver high energy density and power density (38.5 Wh/kg at 802.1 W/kg, 32.0 Wh/kg at 8008.8 W/kg), excellent cyclic stability (82.3% retention after 5000 cycle) and robust mechanical flexibility (no obvious attenuation at bending to different angles). This work will provide a new and smart route for constructing transition metal selenides for supercapacitor devices.