共查询到20条相似文献,搜索用时 31 毫秒
1.
《Ceramics International》2020,46(10):16291-16297
New attractive advances in electrode preparation for supercapacitor applications with rGO based composite materials are eye-catching attention of researchers. Cobalt oxide is considered as an effective electrode for full cell fabrication due to its high specific capacitance. Cost effective solvothermal method was used to prepare pristine Co3O4 nanorods, NiCo2O4 nanorods and NiCo2O4/rGO urchin like nanocilia structure composite materials. The complete electrochemical studies were used to check the obtained product electrochemical activity. The high specific capacitance values are obtained for NiCo2O4/rGO urchin like nanocilia composite electrode material which leads to design a full cell and make use as practical applications with illuminating red, green, blue LED source. The capacitive retention of 92.28% even after 5000 cycles achieved in GCD cyclic performance at a high current density implies its excellent stability. 相似文献
2.
《Ceramics International》2019,45(10):13099-13111
We introduce a facile way to improve the performance of NiCo2O4 electrode by including a Ni seed layer. The seed layer deposited on Ni foam electrode (NiCo2O4/Ni@NF) shows the superior specific capacity of 1142 C g−1 at 1 A g−1 with the excellent cycle stability of ∼96% even after 5000 cycles at a higher current density of 5 A g−1. These values are about 3.7 times higher than that of the electrode (NiCo2O4@NF) without a seed layer, which shows the specific capacity of 305 C g−1@1 A g−1 with cycle stability of 84% even at a lower current density of 1 A g−1. The enhanced performance of the NiCo2O4/Ni@NF electrode may be attributed to lower interface resistance, fast redox reversible reaction, and improved surface active sites. Further, the asymmetric solid-state supercapacitor device is fabricated by using the NiCo2O4/Ni@NF electrode as a positive and reduced graphene oxide (rGO)-Fe2O3 nanograin as a negative electrode with PVA-KOH gel electrolyte, and the NiCo2O4/Ni20@NF//rGO-Fe2O3@NF asymmetric solid state device delivers an areal capacitance of 446 mF cm−2 with a low capacitance loss of 18% even after 10000 cycles. Further, the fabricated asymmetric solid state device shows a maximum energy density of 124.3 Wh cm−2 (at 3.58 kW cm−2) and power density of 14.88 kW cm−2 (at 31.41 Wh cm−2). 相似文献
3.
《Ceramics International》2019,45(14):17192-17203
In this research, we have effectively synthesized a novel NiCo2O4/NiCo2S4 powder by co-precipitation and thin films prepared using a screen-printing method on Ni mesh for supercapacitor applications. Herein, we report the effect of unique hierarchical nanostructures and the systematic effect of Ni and Co on the structural, morphological and electrical properties of the NiCo2O4/NiCo2S4 electrodes. The optimized NiCo2O4/NiCo2S4 electrode shows outstanding performance with a specific capacitance of 1966 F g−1 at 5 mV s−1. The cycling stability reports indicate the NiCo2O4/NiCo2S4 electrodes have an outstanding cyclic stability with 91% capacity retention. From the supercapacitor performance results, we confirmed that the NiCo2O4/NiCo2S4 electrode is useful for the fabrication of symmetric supercapacitors. These results reveal that the NiCo2O4/NiCo2S4 electrodes is a capable electrode material for supercapacitor applications in the future. 相似文献
4.
Mesoporous nickel cobaltite (NiCo2O4) nanoparticles were synthesized via a hydrothermal and soft-templating method through quasi-reverse-micelle mechanism. The physicochemical properties of the NiCo2O4 materials were characterized via X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectra, and nitrogen sorption isotherms measurements. The electrochemical performances of the NiCo2O4 electrode were investigated by cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy tests. The obtained NiCo2O4 materials exhibit typical mesoporous structures, with an average particle size of about 200 nm, a specific surface area of 88.63 m2 g?1, and a total pore volume of 0.337 cm3 g?1. The facile electrolytes penetration for the mesoporous structures favors high-performance of the NiCo2O4 electrode. The NiCo2O4 electrode shows a high specific capacitance (591 F g?1 at 1 A g?1), high-rate capability (248 F g?1 at 20 A g?1), and a good cycling behavior for tested 3,000 cycles, indicating a promising application for electrochemical capacitors. 相似文献
5.
Deyang Zhang Hailong Yan Yang Lu Kangwen Qiu Chunlei Wang Chengchun Tang Yihe Zhang Chuanwei Cheng Yongsong Luo 《Nanoscale research letters》2014,9(1):139
Hierarchical mesoporous NiCo2O4 nanoneedle arrays on carbon cloth have been fabricated by a simple hydrothermal approach combined with a post-annealing treatment. Such unique array nanoarchitectures exhibit remarkable electrochemical performance with high capacitance and desirable cycle life at high rates. When evaluated as an electrode material for supercapacitors, the NiCo2O4 nanoneedle arrays supported on carbon cloth was able to deliver high specific capacitance of 660 F g-1 at current densities of 2 A g-1 in 2 M KOH aqueous solution. In addition, the composite electrode shows excellent mechanical behavior and long-term cyclic stability (91.8% capacitance retention after 3,000 cycles). The fabrication method presented here is facile, cost-effective, and scalable, which may open a new pathway for real device applications. 相似文献
6.
《Ceramics International》2016,42(10):11851-11857
Low-cost dynamic materials for Faradaic redox reactions are needed for high-energy storage supercapacitors. A simple and cost-effective hydrothermal process was employed to synthesize amaryllis-like NiCo2S4 nanoflowers. The sample was characterized by X-ray powder diffraction, Brunauer–Emmett–Teller method, scanning electron microscopy, and transmission electron microscopy. NiCo2S4 nanoflowers were coated onto carbon fiber fabric and used as a binder-free electrode to fabricate a solid-state supercapacitor compact device. The solid-state supercapacitor exhibited excellent electrochemical performance, including high specific capacitance of 360 F g−1 at scan rate of 5 mV s−1 and high energy density of 25 W h kg−1 at power density of 168 W kg−1. In addition, the supercapacitor possessed high flexibility and good stability by retaining 90% capacitance after 5000 cycles. The high conductivity and Faradic-redox activity of NiCo2S4 nanoflowers resulted in high specific energy and power. Thus, NiCo2S4 nanoflowers are promising pseudocapacitive materials for low-cost and lightweight solid-state supercapacitors. 相似文献
7.
《Ceramics International》2021,47(22):31650-31665
In this research work, we report a novel method for developing ternary NiCo2O4 compounds using deep eutectic solvents (DESs) and a strategy for improving their pseudocapacitive performance. NiCo2O4 composites with N-doped carbon nanotubes (NCNTs) were fabricated on Ni foam using a hydrothermal method. The electrochemical performance of the NiCo2O4 was altered with the change in the reaction temperature. The composite of NiCo2O4 and NCNTs demonstrated a maximum value of specific capacity of 303 mAh g−1 at a scan rate of 5 mV s−1. The specific capacity for the composite compound was 1.3-fold greater than that of the pristine NiCo2O4 sample. For practical applications, we constructed a flexible solid-state hybrid supercapacitor comprised of NiCo2O4/NCNTs//activated carbon (AC) cells with an excellent energy density of 12.31 Wh kg−1, outstanding power density of 8.96 kW kg−1, and tremendous electrode stability. The three-dimensional mesoporous nanoflowers and nanotubes-like nanostructures of NiCo2O4 are well-suited for use in hybrid devices as well as convenient for flexible electronic devices. 相似文献
8.
Hierarchical porous nickel cobaltite (NiCo2O4) nanomaterials were synthesized via a hard-templating route. The obtained materials consist of nanostructured cubic NiCo2O4 spinels and a spot of cubic NiO nanoparticles, and the materials display a typical hierarchical porous structure. The NiCo2O4 electrode displays quasireversible dynamics characteristics, mainly Faradaic capacitance behavior and capacitance relaxation feature. The NiCo2O4 electrode exhibits an excellent long cycling behavior with no capacitance decays during 5,000 cycles at a current density of 2?A?g?1 in 1?M KOH electrolytes, and the NiCo2O4 electrode exhibits both high power and energy performances even after 5,000 cycles with respective value of 1,758?W?kg?1 and 8.3?W?h?kg?1 in 1?M KOH electrolytes, indicating that the NiCo2O4 nanomaterials are promising candidates for electrochemical capacitors. 相似文献
9.
《Ceramics International》2022,48(1):313-319
Natural sun light driven photocatalytic materials have received remarkable attention due to their imminent applications in environmental remediation and energy conversions. In this study, natural sun light driven hierarchal spinel nickel cobaltite nanoflakes (NiCo2O4) anchored multiwalled carbon nanotubes (MWCNTs) nanocomposite was synthesized by using simple chemical route. The structural, morphological and functional group of as-prepared NiCo2O4 anchored MWCNTs was studied by using X-ray diffractometry, field emission scanning electron microscopy and Fourier transform infrared spectroscopy. The UV–vis diffusive reflectance spectroscopy results demonstrated decrease in optical bandgap from 1.32 to 1.16eV compared with pristine spinel NiCo2O4 nanoflakes. MWCNTs anchored NiCo2O4 showed extremely good photocatalytic behavior and we verified 98% degradation of MB in 35 min under natural sun light. NiCo2O4 anchored MWCNTs also confirmed its excellent stability and reusability by retaining 96% of photocatalytic efficiency after 7 cycles of operation. Improved photocatalytic behavior of NiCo2O4 anchored MWCNTs nanocomposite in comparison to NiCo2O4 nanoflakes is mainly attributed to excellent electron storage ability of MWCNTs which made catalyst a great acceptor. Moreover, porous structure of MWCNTs not only provides large surface area with more active sites but also increases conductivity and decreases agglomerations on the surface of material which render e-/h+ pair recombination. Overall, this work shed new light for the synthesis of NiCo2O4 anchored MWCNTs with enhanced photocatalytic properties. 相似文献
10.
Huaiyang Chen Xiaoping Shen Keqiang Xu Yao Chen Aihua Yuan Zhenyuan Ji Zhitao Wang Guoxing Zhu 《Journal of the American Ceramic Society》2021,104(12):6696-6708
Binary transition-metal oxides with spinel structure have great potential as advanced anode materials for lithium-ion batteries (LIBs). Herein, NiFe-NiFe2O4/ reduced graphene oxide (rGO) composites are obtained via a facile cyanometallic framework precursor strategy to improve the lithium storage performance of NiFe2O4. In the composites, NiFe-NiFe2O4 nanoparticles with adjustable mass ratios of NiFe2O4 to NiFe alloy are homogeneously deposited on rGO sheets. As anode material for LIBs, the optimized NiFe-NiFe2O4/rGO composite displays remarkably enhanced lithium storage performance with an initial specific capacity as high as 1362 mAh g−1 at 0.1 A g−1 and a decent capacity retention of ca. 80% after 130 cycles. Besides, the composite delivers a reversible capacity of 550 mAh g−1 at 1 A g−1 after 300 cycles. During the charge–discharge cycles, the aggregation of the NiFe-NiFe2O4 nanoparticles and the structural collapse of the electrode can be well alleviated by rGO sheets. Moreover, the conductivity of the electrode can be significantly improved by the well-conductive NiFe alloy and rGO sheets. All these contribute to the improved lithium storage performance of NiFe-NiFe2O4/rGO composites. 相似文献
11.
《Ceramics International》2023,49(12):19652-19663
NiO and NiCo2O4 exhibit excellent synergistic effects and broad application prospects in electrochemical applications. However, the apparent interfacial instability between NiO and NiCo2O4 limits ion transport kinetics, charge/ion transfer, and electrochemical stability. In response, we developed and designed an integrated dodecahedron NiO/NiCo2O4 by a facile in-situ calcination method. Moreover, by utilizing the porous hollow structure of nitrogen-doped carbon capsules (N-Cc) as a conductive network, the N-Ccx@NiO/NiCo2O4 heterostructures with stable interface structure, excellent electrolyte adsorption, and electron transfer pathways were carefully designed. The N-Cc1.0@NiO/NiCo2O4 heterostructures are found to deliver an outstanding specific capacitance of 658.8 F g−1, and a high energy density of 101.40 Wh kg−1 at a power density of 775.03 W kg−1, along with capacitance retention of more than 93.5% after 8000 cycles. Based on the DFT calculations and electrochemical experimental results, this work provides an effective in situ route for the construction of high-performance metal oxide heterostructure electrode materials for new energy storage devices. 相似文献
12.
《Ceramics International》2017,43(13):10174-10182
Nanocomposites of reduced graphene oxide (rGO) and NiCo2S4 with different amount of graphene oxide (GO) are synthesized through a one- step solvothermal method and their catalytic activity towards I-/I3- redox electrolyte for dye-sensitized solar cell (DSSC) application are reported. The growth mechanism of the pristine hierarchical marigold like microspheres of NiCo2S4 that formed without rGO and the nanocomposite of rGO-NiCo2S4 are also proposed. Electrochemical studies confirmed the synergetic effect of nickel and cobalt ions with the high electrical conductive rGO networks that enhance the electrocatalytic activity of NiCo2S4 nanostructures. The synergistic effect between NiCo2S4 and rGO may be attributed to the higher conductivity of rGO and the inverse spinel crystal structure of NiCo2S4 that have more octahedral catalytic active sites of Co3+. The amount of graphene oxide plays the important role of controlling the DSSC performance and the power conversion efficiency. The efficiency achieved for the rGO-NiCo2S4 counter electrode (CE) based DSSC is 8.15%, which is remarkably higher than that of pristine NiCo2S4 (7.36%), and Pt (7.23%) under the same experimental conditions. 相似文献
13.
《Ceramics International》2017,43(2):2057-2062
A novel Ni@NiCo2O4 core/shells structure consisting of the Ni microspheres skeletons and nanosheet-like NiCo2O4 skins was designed and investigated as the electrochemical electrode for supercapacitor. Due to the unique architecture with Ni microspheres as the highly conductive cores improving the electrical conductivity of electrode and external nanosheet-like NiCo2O4 shells as the efficient electrochemical active materials facilitating the contact between the electrode and electrolyte, the as-prepared Ni@NiCo2O4 exhibited excellent electrochemical performance with high specific capacity of 597 F g−1 (1 A g−1) as well as remarkable capacitance retention of 96% (3000 cycles). These impressive results pave the way to design high-performance electrode materials for energy storage. 相似文献
14.
《Ceramics International》2021,47(18):25942-25950
NiCo2S4 is one of the most promising bimetallic sulfides for use in energy-storage systems, but more studies are needed to endow NiCo2S4 with a high electrochemical reaction capability and reversibility. In this work, we present rationally materials design of an optimal NiCo2S4 nanoparticle in a reduced graphene oxide (RGO) matrix as a NiCo2S4/RGO nanocomposite. Furthermore, we report the improvements in the materials technology, demonstrating the NiCo2S4/RGO nanocomposite electrode with an excellent specific capacitance of 963–700 F g−1 at 1–15 A g−1, high capacitance retention of 70%, and long cycle life of 3000 cycles. The practical application is showcased in an asymmetric supercapacitor with a high active-material loading. The NiCo2S4/RGO nanocomposite shows a high energy density of 31 Wh kg−1 at a power density of 987 W kg−1 and maintains an excellent density of 23 Wh kg−1 at a high power density of 7418 W kg−1. The outstanding electrochemical utilization and stability of the NiCo2S4/RGO nanocomposite confirm that our systematic optimization in the materials science and technology in terms of the active-material synthesis, the electrode development, and the device design/fabrication would benefit the future development of high-performance supercapacitors. 相似文献
15.
Transitional metal oxides are prevalent in the energy storage devices due to their remarkable electrochemical activity and charge storage capability. In this study, a spinel structured zinc cobaltite (ZnCo2O4) is doped with Ni and Cr to form a novel (Ni,Cr:ZnCo2O4) electrode material towards supercapacitor (SC) applications. Dopants served as a conductivity booster, particle size reducer and active sites provider benefitting the electrochemical activity. Comparatively, the doped sample delivered a higher capacitance value of 575 Fg-1 in the potential range of 0–0.6V with 1 M KOH solution as an electrolyte which is higher than that of the pristine material and better cyclic stability is improved from 82.2% to 90.24% for 2000 cycles. The specific capacitance value of 30 Fg-1 and 73 Fg-1 at 0.75 Ag-1 is achieved for the fabricated asymmetric supercapacitor device with Ni,Cr:ZnCo2O4 using Cu foil and Ni foam as current collector respectively. The device assembled with doped sample using Ni foam current collector has an energy density of 16.3 WhKg?1 and a power density of 0.9 KWKg?1 superseding the performance of the devices constructed with the pristine ZnCo2O4. The performance of Ni and Cr doped spinel structured zinc cobaltite device indicates a notable progress towards the direction of better performance supercapacitor applications. 相似文献
16.
《Ceramics International》2022,48(10):13684-13694
Iron oxide (Fe2O3) nanoparticles and reduced graphene oxide (rGO) sheets were supersonically sprayed onto a nickel substrate to fabricate flexible supercapacitors. The supersonic impact velocity was adjusted by varying the air chamber pressure from 2 to 6 bar, which facilitated the self-healing of Stone-Wall defects in rGO sheets. Supersonic spraying caused exfoliation of the rGO sheets, which in turn increased the surface area and adherence of the Fe2O3 nanoparticles. The optimal case exhibited a specific capacitance of 1.44 F?cm-2 at a current rate of 1.5 mA?cm-2 and the energy density was 14.23 mWh?cm-3 at 250 mW?cm-3. The width of the potential window increased to 1.4 V, implying a significant increase in the energy storage capability. The energy density of the supersonically sprayed Fe2O3/rGO electrode also showed no signs of deterioration even when the increased current density interfered with the electrode performance. 相似文献
17.
《Carbon》2014
Ultrathin scale-like nickel cobaltite (NiCo2O4) nanosheets supported on nitrogen-doped reduced graphene oxide (N-rGO) are successfully synthesized through a facile co-precipitation of Ni2+ and Co2+ in the presence of sodium citrate and hexamethylenetetramine and subsequent calcination treatment. The composition and morphology of NiCo2O4 nanosheets@nitrogen-doped reduced graphene oxide (denoted as NiCo2O4 NSs@N-rGO) were characterized by Scanning electron microscope, Transmission electron microscope, X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller and thermogravimetric analysis. The thickness of NiCo2O4 nanosheets anchored on the reduced graphene oxide is around 4 nm. The capacitance of NiCo2O4 NSs@N-rGO is evaluated by cyclic voltammogram and galvanostatic charge/discharge with the result that the NiCo2O4 NSs@N-rGO could deliver a specific capacitance of 1540 F g−1 after 1000 cycles at 10 A g−1. 相似文献
18.
Sobia Jabeen Muhammad Aadil James Williams M.S. Awan Javed Iqbal Sonia Zulfiqar Nosheen Nazar 《Ceramics International》2021,47(16):22345-22355
The electroactive material with a porous structure, good electrical conductivity, hybrid composition, and a higher surface is considered more suitable for applications as an electrode in the energy storage device. Herein, we report the preparation of In2O3 nanoparticles via a simple chemical route and their nanocomposites with 10% (IOG-10), 30% (IOG-30), 50% (IOG-50), 70% (IOG-70), and 100% G-100 graphene nanoplatelets (GNPs) via ultra-sonication. The presence of GNPs in the nanocomposite samples was verified by powder X-ray diffraction (PXRD), Raman, and scanning electron microscopy (SEM) results. The prepared samples were loaded onto the porous 3D nickel foam (NF) substrate to manufacture the working electrode for electrochemical testing. The cyclic voltammetry (CV), as well as galvanostatic charge/discharge (GCD), results proposed the IOG-30@NF as a suitable electrode for electrochemical applications. More precisely, the IOG-30@NF electrode shows a specific capacitance of 1768 Fg-1 at 1 Ag-1, which is considerably higher than that of either G-100@NF or In2O3@NF electrodes. Besides, the IOG-30@NF electrode shows good cyclic stability of 92.2% after 4000 GCD tests completed at 12 Ag-1. When increasing the current density value from 1 to 4, the IOG-30@NF electrode maintains a specific capability of 81%, ensuring its exceptional rate capability. The higher specific capacity, higher rate-performance, and better cyclic activity of the IOG-30@NF electrode can be ascribed to its hybrid-composition, nanoarchitecture In2O3, 3D but porous nickel foam substrate, appropriate graphene content, and interaction between In2O3 nanoparticles and GNPs nanosheets. 相似文献
19.
Sadegh Azizi Darsara Majid Seifi Mohammad Bagher Askari Mohammad Osquian 《Ceramics International》2021,47(15):20992-20998
In this research, Ni3S4–NiS with starfish morphology was synthesized with a simple hydrothermal method and then hybridized with reduced graphene oxide (rGO) as a material for high-performance supercapacitors. The crystal structure and morphology of the as-prepared materials were studied by X-ray diffraction spectroscopy and electron microscopy. Uniform distribution of Ni3S4–NiS on rGO was observed from electron microscopy images. The results showed that Ni3S4–NiS/rGO with a specific capacitance of 1578 Fg-1 and discharge time of 603 s at the current density of 0.5 Ag-1 has more capacity and stability relative to Ni3S4–NiS. The cyclic stability after 5000 cycles showed that the Ni3S4–NiS/rGO electrode is stable, and 91% of its corresponding initial capacitance retained at the end of 5000 cycles. The good results in capacitance and stability of this electrode can be regarded as an improvement for the development of highly efficient and economic supercapacitors for portable electronic devices. 相似文献
20.
In this work, NiCo2O4 coral-like porous crystals, nanoparticles and submicron-sized particles have been systematically prepared via a facile sol–gel method, using citric acid as the chelating ligand and H2O (H2O-DMF) as solvent. The experimental results reveal that the initial molar concentration of reactants, reaction time and solvent species involved are crucial for preparing the target products. The as-obtained samples were characterized by means of XRPD, FESEM, HRTEM, EDS and SAED techniques. Finally, the electrochemical performances of NiCo2O4 crystals with distinct morphologies were evaluated by cyclic voltammetry, and galvanostatic charge–discharge cycling techniques. The results show that submicron-sized NiCo2O4 particles exhibit the best capacitive properties with high specific capacitance and excellent cycle stability. At a high mass loading (5.6 mg cm−2), specific capacitance value of submicron-sized NiCo2O4/Ni electrode reaches as much as 217 F g−1, and 96.3% of which can be still maintained after 600 charge–discharge cycles. Therefore, NiCo2O4 crystal is very promising for real application in supercapacitors. 相似文献