The rambutan-like C@NiCo2O4 composites for enhanced microwave absorption performance

Li, Cuiping; Ge, Yaqing; Jiang, Xiaohui; Zhang, Zhiming; Yu, Liangmin

doi:10.1007/s10854-018-00592-3

Cited by 28 publications

(15 citation statements)

References 54 publications

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“…They obtained rambutan-like spinels microspheres. The same architecture has been reported by Li et al [ 36 ]. The product has also shown the morphology of nanoneedles.…”

Section: Resultssupporting

confidence: 55%

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

et al. 2020

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The renewable energy technologies require electrocatalysts for reactions, such as the oxygen and/or hydrogen evolution reaction (OER/HER). They are complex electrochemical reactions that take place through the direct transfer of electrons. However, mostly they have high over-potentials and slow kinetics, that is why they require electrocatalysts to lower the over-potential of the reactions and enhance the reaction rate. The commercially used catalysts (e.g., ruthenium nanoparticles—Ru, iridium nanoparticles—Ir, and their oxides: RuO2, IrO2, platinum—Pt) contain metals that have poor stability, and are not economically worthwhile for widespread application. Here, we propose the spinel structure of nickel-cobalt oxide (NiCo2O4) fabricated to serve as electrocatalyst for OER. These structures were obtained by a facile two-step method: (1) One-pot solvothermal reaction and subsequently (2) pyrolysis or carbonization, respectively. This material exhibits novel rod-like morphology formed by tiny spheres. The presence of transition metal particles such as Co and Ni due to their conductivity and electron configurations provides a great number of active sites, which brings superior electrochemical performance in oxygen evolution and good stability in long-term tests. Therefore, it is believed that we propose interesting low-cost material that can act as a super stable catalyst in OER.

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“…They obtained rambutan-like spinels microspheres. The same architecture has been reported by Li et al [ 36 ]. The product has also shown the morphology of nanoneedles.…”

Section: Resultssupporting

confidence: 55%

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

et al. 2020

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“…As shown in Figure S27b (Supporting Information), the corresponding slopes are calculated to be ≈1.0, revealing a capacitor‐like rate performance. [ 16b ] Besides, the Na + ion diffusion coefficient ( D Na + ) was obtained by the galvanostatic intermittent titration technique measurement in Figure S28 (Supporting Information), from which the values of D Na + are calculated to be ≈10 −11 S cm −1 (Figure 3e; and Figure S29, Supporting Information), further confirming the good kinetics of PPTO–CNTs electrodes. The detailed calculation process can be seen in the Supporting Information section.…”

Section: Resultsmentioning

confidence: 74%

“…However, the unsatisfied energy density and poor conductivity of the previously reported rigid linear polymer cathode materials would limit their further application for sodium batteries. [ 16 ] For flexible linear polymers, they are likely to twine with each other, leading to some active sites covered inside the aggregates. [ 12b,13 ] For example, the flexible poly(pyrene‐4,5,9,10‐tetraone) (PPTO) material exhibits a practical capacity of 234 mAh g −1 (with a high theoretical capacity of ≈400 mAh g −1 ) and a redox potential of ≈2.3 V in lithium batteries.…”

Section: Introductionmentioning

confidence: 99%

In Situ Polymerized Conjugated Poly(pyrene‐4,5,9,10‐tetraone)/Carbon Nanotubes Composites for High‐Performance Cathode of Sodium Batteries

Shi

Liu

Lü

et al. 2020

Advanced Energy Materials

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Sodium batteries have attracted much attention in recent years because of their comprehensive electrochemical performance, high abundance, and low cost of sodium resources. However, the unsatisying energy density and poor cycling stability of current sodium batteries restrict their large‐scale applications. Here an in situ polymerization method to construct π‐conjugated poly(pyrene‐4,5,9,10‐tetraone)/carbon nanotubes (PPTO–CNTs) composites as cathode materials for sodium batteries is used. It is found that the π–π interaction between PPTO and CNTs in PPTO–CNTs composites overcomes the repulsion between each PPTO unit, leading to a flat configuration of PPTO and enhancing the electronic conductivity and active sites accessibility of PPTO–CNTs composites. Thus, PPTO–CNTs electrodes display a high discharge capacity of 360.2 mAh g−1, long cycling stability (a capacity retention of 95.1% after 1300 cycles), and high rate capability (194.5 mAh g−1 at 10.0 A g−1). Moreover, a pouch‐type Na//PPTO–CNTs cell with an energy density of ≈204.0 Wh kg−1PPTO+Na is fabricated, exhibiting a capacity retention of 91.2% after 100 cycles. In addition, the combination of experiments and theoretical calculations demonstrates the four‐sodium‐ion redox chemistry mechanism of each PPTO molecule unit. This work should promote the practical application of conjugated polymers in high‐performance sodium batteries.

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“…However, by partially replacing Co with Ni, the electrical conductivity, electrochemical properties, and structural stability of NiCo 2 O 4 are higher than those of nickel oxide and cobalt oxide [15] . In microwave absorption, NiCo 2 O 4 also has higher magnetic properties, which gives it a higher application potential [16] . Han et al.…”

Section: Introductionmentioning

confidence: 99%

Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

Wu,

Zhu,

Yan

et al. 2023

Chemistry A European J

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Electromagnetic pollution could harm sensitive electronic equipment due to the rising use of electronic devices and communication infrastructure. The supercapacitor‘s electrochemical performance should be enhanced, and electromagnetic damage should be prevented. This study proposes NiCo2O4/CF composites for supercapacitors and microwave absorption. They are made by combining hydrothermal and annealing processes. Dense NiCo2O4 nanoneedles were uniformly grown on the outer layer of carbon foam (CF) as a growth skeleton, preventing the agglomeration of NiCo2O4. The composite had a specific capacitance of 537.5 F/g at 1 A/g. When the current density was set to 1 A/g, the supercapacitor that used NiCo2O4/CF as the cathode had a specific capacitance of 70.7 F/g, and when the current density was increased to 10 A/g, the original specific capacitance of 87.2 % could still be maintained after 5000 charge‐discharge cycles. At a power density of 3695.5 W/kg, an energy density of 22.1 Wh/kg could be maintained. Furthermore, we performed a microwave absorption test and determined its reflection loss curve for various sample thicknesses. Recombination enhanced the composite material‘s microwave absorption capability by greatly reducing the dielectric loss and the magnetic loss.

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The rambutan-like C@NiCo2O4 composites for enhanced microwave absorption performance

Cited by 28 publications

References 54 publications

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

In Situ Polymerized Conjugated Poly(pyrene‐4,5,9,10‐tetraone)/Carbon Nanotubes Composites for High‐Performance Cathode of Sodium Batteries

Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

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The rambutan-like C@NiCo2O4 composites for enhanced microwave absorption performance

Cited by 28 publications

References 54 publications

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

In Situ Polymerized Conjugated Poly(pyrene‐4,5,9,10‐tetraone)/Carbon Nanotubes Composites for High‐Performance Cathode of Sodium Batteries

Dense NiCo2O4 Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

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Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties