Nanosheets of nickel, cobalt and manganese triple hydroxides/oxyhydroxides as efficient electrode materials for asymmetrical supercapacitors

Nath, Anish Reghu; Jayachandran, Aswathi; Sandhyarani, N.

doi:10.1039/c9dt00302a

Cited by 29 publications

(6 citation statements)

References 47 publications

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“…In the O 1s region, the peaks at 531.06 and 531.68 eV can be indexed to nickel–oxygen bonds and oxygen–hydrogen bonds, respectively. The peak at 533.38 eV can be attributed to adsorbed H 2 O or possibly adsorbed O 2 . − The FTIR spectrum of CNT@NiOOH is shown in Figure S2b. The peak at around 567.7 cm –1 is attributed to the in-plane bending vibration of hydroxyl groups of Ni–OH.…”

Section: Resultsmentioning

confidence: 99%

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

Wang¹,

Lu²,

et al. 2021

ACS Appl. Mater. Interfaces

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The shuttle effects of polysulfide intermediates (LiPSs) and sluggish kinetics during sulfur reduction reaction (SRR) process severely exacerbate the electrochemical performances of Li–S batteries. Herein, a unique nanocatalyst comprising β-NiOOH nanosheets uniformly implanted on the surface of carbon nanotubes (CNT@NiOOH) was designed and synthesized for sulfur cathodes. The β-NiOOH nanosheets have great capability of adsorbing LiPSs as well as superior catalytic activity for accelerating LiPS conversion, providing a more efficient method to restrain shuttle effects and improve the kinetics of SRR. Moreover, the nanometer-scale epitaxial growth and uniform distribution of β-NiOOH on CNTs provide a multidimensional catalytic skeleton with sufficient accessible active surfaces, unimpeded LiPS diffusion pathways, and resultant high utilization of active sites. Simultaneously, stable electron transportation pathways are also obtained by being synthesized on CNTs to avoid the faultiness of poor electron conductivity of β-NiOOH. These conspicuous advantages contribute to fully exert the catalytic and LiPS anchoring potential of CNT@NiOOH, bringing about the ultralong cycle performance and excellent capacity reversibility at a high discharge rate. Reticular CNT@NiOOH frameworks are assembled with the sulfur composite materials (SCMs) by a self-assembly method, and a super-high capacity of 813.3 mA h g–1 after 400 cycles at 0.5 C with a small capacity degradation of 0.07% per cycle is achieved. Furthermore, the 3 A h pouch-type cell with the SCM/CNT@NiOOH cathode attains a super-high energy density of about 320 W h kg–1 and shows a superior capacity retention as high as 75.9% after 50 cycles at 0.2 C. This work provides a promising method to accelerate the SRR process and restrain the shuttle effects for practical long-life and high-capacity Li–sulfur batteries.

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Section: Resultsmentioning

confidence: 99%

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

Wang¹,

Lu²,

et al. 2021

ACS Appl. Mater. Interfaces

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“…The assembled CoMnO 2 /N20@PICF-6//Fe 2 O 3 /N20@PICF device delivered a maximum energy density of 60.2 Wh kg −1 at power density of 490 W kg −1 , as shown by Ragone plot (Figure 7h). Compared to other devices, these values were higher than other energy storage devices, such as NiCoMn-TH/AEG//CFP-S (23.5 Wh kg −1 at 427 W kg −1 ) [40], NiCoMn-OH//AC (43.2 Wh kg −1 at 790 W kg −1 ) [41], CoMn-HW/RGO10//AC (38.3 Wh kg −1 at 8000 W kg −1 ) [42], CoMn LDH/PPy//MLG (29.6 Wh kg −1 at 500 W kg −1 ) [43], NCM//AC (23.7 Wh kg −1 at 2625 W kg −1 ) [44], Ni-Mn LDH/rGO//AC (33.8 Wh kg −1 at 850 W kg −1 ) [45], and Co/Mn-ZIF//AC (52.5 Wh kg −1 at 1080 W kg −1 ) [46], as summarized in Table S1. As a result, the fabricated wire-type ASC device exhibited the excellent electrochemical performance with good electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

et al. 2020

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In this work, we report the carbon fiber-based wire-type asymmetric supercapacitors (ASCs). The highly conductive carbon fibers were prepared by the carbonized and graphitized process using the polyimide (PI) as a carbon fiber precursor. To assemble the ASC device, the CoMnO2-coated and Fe2O3-coated carbon fibers were used as the cathode and the anode materials, respectively. Herein, the nanostructured CoMnO2 were directly deposited onto carbon fibers by a chemical oxidation route without high temperature treatment in presence of ammonium persulfate (APS) as an oxidizing agent. FE-SEM analysis confirmed that the CoMnO2-coated carbon fiber electrode exhibited the porous hierarchical interconnected nanosheet structures, depending on the added amount of APS, and Fe2O3-coated carbon fiber electrode showed a uniform distribution of porous Fe2O3 nanorods over the surface of carbon fibers. The electrochemical properties of the CoMnO2-coated carbon fiber with the concentration of 6 mmol APS presented the enhanced electrochemical activity, probably due to its porous morphologies and good conductivity. Further, to reduce the interfacial contact resistance as well as improve the adhesion between transition metal nanostructures and carbon fibers, the carbon fibers were pre-coated with the Ni layer as a seed layer using an electrochemical deposition method. The fabricated ASC device delivered a specific capacitance of 221 F g−1 at 0.7 A g−1 and good rate capability of 34.8% at 4.9 A g−1. Moreover, the wire-type device displayed the superior energy density of 60.2 Wh kg−1 at a power density of 490 W kg−1 and excellent capacitance retention of 95% up to 3000 charge/discharge cycles.

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“…A Pt foil and a saturated calomel electrode (SCE) served as counter electrode and reference electrode, respectively. The specific capacities C (F g −1 ) of working electrode was calculated using the formula below [37]:…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

CoNi₂S₄ nanosheets on nitrogen-doped carbon foam as binder-free and flexible electrodes for high-performance asymmetric supercapacitors

Ding

et al. 2019

Nanotechnology

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Flexible electrode materials show many advantages and hold great prospects for energy storage application. But, the synthesis processes of these kind of materials are always complicated, are low in efficiency and high in cost. Here, we propose a facile and cost-effective two-step synthesis strategy of a flexible electrode by growing ultrathin and vertical CoNi2S4 nanosheets on nitrogen-doped carbon foam (CoNi2S4 NSs@NCF). The NCF is obtained by direct carbonization of the melamine foam. When evaluated as binder-free electrode material for supercapacitor in three-electrode system, the CoNi2S4 NSs@NCF exhibits an excellent specific capacitance of 1576.8 F g−1 and a superior cycling stability (91.5% capacitance retention at the 5000th cycle). Then, an asymmetrical supercapacitor was fabricated using the as-synthesized material as the positive electrode and activated carbon as the negative electrode, which delivers a high energy density of 42.8 Wh kg−1 at a power density of 399.7 W kg−1, remarkable rate capability and satisfactory cycling stability (85.3% capacitance retention at the 5000th cycle). In brief, our work offers a low-cost and facile approach to prepare promising flexible electrode materials for high-performance supercapacitors.

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Nanosheets of nickel, cobalt and manganese triple hydroxides/oxyhydroxides as efficient electrode materials for asymmetrical supercapacitors

Abstract: An in situ method to fabricate thin nanosheets of Nickel, Cobalt and Manganese composite for charge storage applications is reported.

Cited by 29 publications

References 47 publications

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

CoNi₂S₄ nanosheets on nitrogen-doped carbon foam as binder-free and flexible electrodes for high-performance asymmetric supercapacitors

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Nanosheets of nickel, cobalt and manganese triple hydroxides/oxyhydroxides as efficient electrode materials for asymmetrical supercapacitors

Abstract: An in situ method to fabricate thin nanosheets of Nickel, Cobalt and Manganese composite for charge storage applications is reported.

Cited by 29 publications

References 47 publications

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

Rational Design of β-NiOOH Nanosheet-Sheathed CNTs as a Highly Efficient Electrocatalyst for Practical Li–S Batteries

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

CoNi2S4 nanosheets on nitrogen-doped carbon foam as binder-free and flexible electrodes for high-performance asymmetric supercapacitors

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Product

Resources

About

CoNi₂S₄ nanosheets on nitrogen-doped carbon foam as binder-free and flexible electrodes for high-performance asymmetric supercapacitors