Co3O4 Nanowires on Flexible Carbon Fabric as a Binder-Free Electrode for All Solid-State Symmetric Supercapacitor (original) (raw)
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Freestanding Co 3 O 4 nanowire array for high performance supercapacitors
We report a single-crystalline Co 3 O 4 nanowire array grown on a nickel foam prepared by a hydrothermal synthesis method for supercapacitor application. The Co 3 O 4 nanowires show sharp tips and have an average diameter of 70 nm, and a length up to 25 mm. Impressively, the as-prepared single-crystalline Co 3 O 4 nanowire array exhibits noticeable pseudocapacitive performance with a high capacitance of 754 F g 21 at 2 A g 21 and 610 F g 21 at 40 A g 21 as well as excellent cycling stability. The enhanced supercapacitor performance is due to the unique one-dimensional (1D) architecture, which provides fast diffusion paths for ions and facilitates the electron and ion transfer on the Co 3 O 4 / electrolyte interfaces. Moreover, the 1D nanowire array can accommodate the volume expansion and restrain the pulverization and deterioration of Co 3 O 4 during the repeated cycling process, resulting in enhanced cycling stability.
Nanoscale, 2015
Flexible all-solid-state supercapacitors have offered promising applications as novel energy storage devices based on their merits, such as small size, low cost, light weight and high wearability for high-performance portable electronics. However, one major challenge to make flexible all-solid-state supercapacitors depends on the improvement of electrode materials with higher electrical conductivity properties and longer cycling stability. In this article, we put forward a simple strategy to in situ synthesize 1D CoMoO4 nanowires (NWs), using highly conductive CC and an electrically conductive PPy wrapping layer on CoMoO4 NW arrays for high performance electrode materials. The results show that the CoMoO4/PPy hybrid NW electrode exhibits a high areal specific capacitance of ca. 1.34 F cm(-2) at a current density of 2 mA cm(-2), which is remarkably better than the corresponding values for a pure CoMoO4 NW electrode of 0.7 F cm(-2). An excellent cycling performance of nanocomposites o...
Journal of Inorganic and Organometallic Polymers and Materials, 2023
： ： ： ：Flexible fiber-shaped supercapacitors (FSSCs) are recently of extensive interest for portable and wearable electronic gadgets. Yet the lack of industrial-scale flexible fibers with high conductivity and capacitance and low cost greatly limits its practical engineering applications. To this end, we here present pristine twisted carbon fibers (CFs) coated with a thin metallic layer via electroless deposition route, which exhibits exceptional conductivity with ～ 300% enhancement and superior mechanical strength (~1.8 GPa). Subsequently, the commercial available conductive pen ink modified high conductive composite fibers, on which uniformly covered ultrathin nickel-cobalt double hydroxides (Ni-Co DHs) was introduced to fabricate flexible FSSCs. The synthesized functionalized hierarchical flexible fibers exhibit high specific capacitance up to 1.39 F•cm-2 in KOH aqueous electrolyte. The asymmetric solid-state FSSCs show maximum specific capacitance of 28.67 mF•cm-2 and energy density of 9.57 µWh•cm-2 at corresponding power density as high as 492.17 µW•cm-2 in PVA/KOH gel electrolyte, with demonstrated high flexibility during stretching, demonstrating their potentials in flexible electronic devices and wearable energy systems.
Elsevier, 2019
• CuCoSe nanowire grown WCF based structural supercapacitor was developed. • Device exhibited high electrochemical performance with brilliant cyclicability. • Polyester resin based electrolyte was developed with ionic liquid and Li-salt. • Excellent energy (191.64 mWhk g −1) and power densities (36.65 W kg −1) achieved. • At mechanical failure (481.29 MPa), 77.3% capacitance retention were recorded. A R T I C L E I N F O Keywords: Structural supercapacitor Multifunctionality Solid electrolyte Electrochemical performance Mechanical property A B S T R A C T Structural supercapacitors provide a variety of opportunities for woven carbon fibers in portable electronics, hybrid automobiles and aerospace applications. We describe herein the synthesis of bimetallic Cu-Co selenide nanowires based on woven carbon fibers, and their use as electrodes in supercapacitors. Woven Kevlar fiber is used as separator for the electrodes and a polyester resin with an ionic liquid and lithium salt is used as solid polymer electrolyte. The supercapacitors exhibit efficient energy storage and significant enhancements in mechanical strength (89.38%) and modulus (70.41%) over those of bare woven carbon fiber base supercapacitors. The specific capacitance of these supercapacitors increases from 0.197 F g −1 to 28.63 F g −1 after the growth of nanowires, with accordingly high energy density (191.64 mW h kg −1) and power density (36.65 W kg −1). In situ mechano-electrochemical tests of these supercapacitors yield excellent capacitance retention (77.3%) at the mechanical failure point (481.29 MPa).
Small, 2020
Battery-type materials are promising candidates to achieve high specific capacity for supercapacitors. However, their slow reaction kinetics hinders the improvement in electrochemical performance. Herein, we report a hybrid structure of P-doped Co3O4 (P-Co3O4) ultrafine nanoparticles in situ encapsulated into P, N co-doped carbon (P, N-C) nanowires by a pyrolysis-oxidation-phosphorization of 1D metal-organic framework derived from Co-layered double hydroxide as self-template and reactant. This hybrid structure prevents active material agglomeration and maintains a 1D oriented arrangement, which exhibits a large accessible surface area and hierarchically porous feature, enabling sufficient permeation and transfer of electrolyte ions. Theoretical calculations demonstrate that the P dopants in P-Co3O4@P, N-C could reduce the adsorption energy of OH − and regulate the electrical properties. Accordingly, the P-Co3O4@P, N-C delivers a high specific capacity of 669 mC cm −2 at 1 mA cm −2 and an ultralong cycle life with only 4.8% loss over 5000 cycles at 30 mA cm −2. During the fabrication of P-Co3O4@P, N-C, Co@P, N-C is simultaneously developed, which can be integrated with P-Co3O4@P, N-C for the assembly of asymmetric supercapacitors. These devices achieve a high energy density of 47.6 W h kg −1 at 750 W kg −1 and impressive flexibility, exhibiting a great potential in practical application.
A novel dumbbell-shaped mixed bimetallic oxide (Ni 1.71 Co 1.29 O 4 ) is directly anchored on activated carbon fiber textile (CFT) for high-performance flexible symmetric supercapacitors (NCO@CFT-FSSCs). The asfabricated NCO@CFT-FSSC exhibits excellent supercapacitive performance by achieving the highspecific capacity of 200 mAh/g at 1 A/g with excellent rate capability of 71% at 10-folded high current density. The NCO@CFT-FSSC showed outstanding cycling stability over 5000 cycles by retaining 94.78% capacity at a current density of 12.5 A/g. Moreover, the NCO@CFT-FSSC possesses good flexible performance and maintained 89.64% capacity over 500 bending cycles. Therefore, the achieved fascinating charge storage capabilities along with excellent flexibility ensure that Ni 1.71 Co 1.29 O 4 being a potential material for high-performance supercapacitors.
Electrochemical capacitance study on Co3O4 nanowires for super capacitors application
One-dimensional Co 3 O 4 nanowires have been prepared by utilizing the ordered mesoporous silica material SBA-15 as template. The results of transmission electron microscope (TEM) and N 2 adsorption-desorption characterizations show that the Co 3 O 4 nanowires possess a uniform size and a large Brunauer-Emmett-Teller (BET) surface area. Its electrochemical performance was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques in various concentration of KOH solution. This nanomaterial shows a small resistance, a high specific capacitance (SC), and a strong cyclic stability. The maximal SC value of 373 FÁg -1 was obtained in 6 M electrolyte under the scan speed of 3 mVÁs -1 at the first CV cycle. After 500 CV cycles, the SC value is about 90% of the original value. It is considered that the short path of ion transfer given by nanomaterial brought on the great pseudo capacitance performance.
The increasing demand for energy has triggered tremendous research efforts for the development of lightweight and durable energy storage devices. This requires exploring simple and economical methods to prepare the active materials and to design lightweight, flexible, free-standing supercapacitor electrodes in an inexpensive binder-free process. Herein, we try to address both these critical issues using CNOs and their composite with CuO as the active material. Active materials were supported on cotton wipes by a simple " sonication and drying " process to obtain lightweight , flexible and free-standing binder-free electrodes. In a symmetrical two-electrode cell, a pristine CNO electrode delivers a specific capacitance of 102.16 F g À1 (20 mV s À1), an energy density of 14.18 W h kg À1 and a power density of 2448 W kg À1 , which are the highest values reported so far for CNO-based materials. CNO–CuO nanocomposites demonstrate a very significant specific capacitance of 420 F g À1 (10 mV s À1) with deliverable energy and power density at 58.33 W h kg À1 and 4228 W kg À1 , respectively. Electrodes of both the active materials show an excellent cyclic performance and stability, retaining up to 90–95% of their initial capacitance after 5000 charge–discharge cycles at a current density of 5 A g À1. A simple cost estimation indicates that our device can deliver an energy density of 58.33 W h kg À1 at an estimated cost of less than 1 $.