Reduced graphene oxide decorated with octahedral NiS<sub>2</sub>/NiS nanocrystals: facile synthesis and tunable high frequency attenuation

Lü, Min; Gao, Na; Zhang, Xiaojuan; Wang, Guang-Sheng

doi:10.1039/c8ra10633a

Cited by 54 publications

(22 citation statements)

References 48 publications

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“…Our group synthesized a series of CuS particles with multistage nanostructures by a simple wet chemical method, and the CuS-PVDF composites (5 wt%) achieved the minimum reflection loss of À 102 dB at 7.7 GHz with thin absorber thickness of 3.5 mm. [28] Other metal sulfides have also shown great potential in this field, such as CdS, [29] ZnS, [30] CoS, [31] PbS [32] etc. Among these TMDCs, nickel-sulfur compounds exhibit a variety of phases and structures because the valence state of nickel is easy to adjust, which result in coexisting of many phases in the synthesis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Yang

et al. 2020

ChemistrySelect

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A series of nickel chalcogenide compounds (NiS2, NiS, NiO and NiSe2) with nanoscale hollow sphere structure have been successfully designed and fabricated by a simple and effective hydrothermal process. By appropriately adjusting the reaction temperature, we have obtained chalcogenide nickel nanomaterials with uniform size and controllable morphology. Subsequently, the electromagnetic wave absorption properties of nickel chalcogenide nano‐hollow sphere compounded with paraffin and polyvinylidene fluoride (PVDF) were investigated in a frequency range of 2–18 GHz. Under the same filling amount, the optimal absorbing performance of PVDF‐based composites can all exceed −10dB, which is significantly better than paraffin‐based composites. Therefore, PVDF‐based composites are more conducive to microwave absorption performance than paraffin‐based composites. Interestingly, the optimal effective frequency bandwidth of NiS/PVDF nanocomposites with 20 wt% filler content covers 5.0 GHz at a thin coating layer of 2.0 mm, and the corresponding reflection loss value can reach −36.3 dB at 15.2 GHz. Moreover, the fundamental attenuation mechanisms are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Yang

et al. 2020

ChemistrySelect

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“…The spectrum of rGO-Ni shows oxygen-containing groups, i.e., OH and C=O lines are decreased, compared with GO, which indicated that the oxygen-containing group was reduced. This indicated that our proposed microwave irradiation methods for the mixture of GO and NiSO 4 successfully reduced the oxygen functional groups [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is observed that all Ni-S systems such as NiS, NiS 2 , Ni 3 S 2 , and Ni 3 S 4 are still present at reaction times 10, 20, and 30 min. In contrast, the highest peak appears at 20° at reaction times 10, 20, and 30 min, representing the crystal system of the rGO decorated N-S system [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…i.e., OH and C=O lines are decreased, compared with GO, which indicated that the oxygen-containing group was reduced. This indicated that our proposed microwave irradiation methods for the mixture of GO and NiSO4 successfully reduced the oxygen functional groups [35]. In order to find the optimum reaction time, the reaction times were varied for 5 min, 10 min, 20 min, and 30 min, with fixed parameters of mass of 0.5 g, a gas flow rate of 0.4 L/min, and microwave power of 80P (720 W).…”

Section: Ftir Analysismentioning

confidence: 99%

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Superhydrophobic Ni-Reduced Graphene Oxide Hybrid Coatings with Quasi-Periodic Spike Structures

et al. 2022

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Recently, sophisticated technologies are applied to design a certain surface nature that can have superhydrophobic properties. Thus, a simple spray technique was introduced to prepare a superhydrophobic surface using rGO with Ni-S system (rGO-Ni) by using NiSO4 catalyst under microwave irradiation at various reaction times of 5, 10, 20, and 30 min. The GO reduction was conducted at a fixed Ar/H2 ratio, a flow rate of 0.4 L/min, microwave power of 720 W, and a mass of 0.5 g. GO powder with nickel sulfate catalyst was treated under Ar/H2 (4:1) mixture for GO reduction, where Ar and H2 were expected to prevent the rebinding of oxygen released from GO. The result of XRD and Raman measurement confirms that rGO-Ni prepared at reaction time 20 min exhibit the highest reduction of GO and the presence of various Ni-S crystal structures such as NiS, NiS2, Ni3S2, and Ni3S4 due to decomposition of NiSO4. The rGO-Ni coating performance shows superhydrophobic nature with a contact angle of 150.1°. The AFM images show that the addition of nickel to rGO produces a quasi-periodic spike structure, which increases the superhydrophobicity of the r-GO-Ni coated glass with a contact angle of 152.6°. It is emphasized that the proposed simple spray coating using rGO-Ni provides a more favorable option for industry application in obtaining superhydrophobic surfaces.

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“…[24] With respect to the S 2p spectra (Figure 2b), the two peaks located at 161.2 and 163.4 eV can be attributed to the S 2− 2p 3/2 and S 2 2− 2p 1/2 orbitals, respectively, and the another peak observed at 162.3 eV is assigned to the overlap of S 2− 2p 1/2 and S 2 2− 2p 3/2 orbitals, indicating the existence of both NiS and NiS 2 . [8,20,21,25] In addition, the peak at 169.0 eV is associated with the oxidized sulfur species. [26] Notably, the Ni 2p signals of NiS 2 /NiS 2 -NiS are shifted to the lower binding energy region compared with that of the NiS 2 /CC, and exhibit a positive shift as compared to the NF+S (Figure 2c).…”

Section: Synthesis and Structural Characterizations Of Hierarchical N...mentioning

confidence: 99%

Swapping Catalytic Active Sites from Cationic Ni to Anionic S in Nickel Sulfide Enables More Efficient Alkaline Hydrogen Generation

Wang

Qin

et al. 2022

Advanced Energy Materials

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Tuning active sites in catalyst design is the key to boosting the intrinsic activity of hydrogen evolution reaction (HER). Cationic Ni has been widely established as an active site in nickel sulfide due to the relatively low Gibbs free energy of hydrogen adsorption (ΔGH*). However, one of the big unsettled issues is whether S can be activated as a more active site than Ni in NiS2. Herein, the swapping of catalytic active sites from cationic Ni to anionic S in a hierarchical structure consisting of NiS2 nanoflowers grown on dual‐phased NiS2‐NiS foam (denoted as NiS2/NiS2‐NiS) is shown. A combined study of theoretical calculations and X‐ray photoelectron spectroscopy analysis demonstrate the remarkably antidromic electron transfer from Ni to S sites, therefore relieving the adsorption of hydrogen species and endowing a higher intrinsic activity at the S site over the Ni site. The new catalyst therefore exhibits superior HER performance, identified by doubling in the intrinsic activity and a twofold increased turnover frequency value compared to its pure NiS2 counterpart (0.028 s−1 vs 0.015 s−1 at the applied overpotential of 200 mV). The NiS2/NiS2‐NiS electrode also demonstrates outstanding activity toward the oxygen evolution reaction and overall water splitting.

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Reduced graphene oxide decorated with octahedral NiS₂/NiS nanocrystals: facile synthesis and tunable high frequency attenuation

Abstract: Reduced graphene oxide (RGO) decorated with octahedral NiS2/NiS nanocrystals were fabricated and they possessed an excellent microwave absorption performance in the high frequency range.

Cited by 54 publications

References 48 publications

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Superhydrophobic Ni-Reduced Graphene Oxide Hybrid Coatings with Quasi-Periodic Spike Structures

Swapping Catalytic Active Sites from Cationic Ni to Anionic S in Nickel Sulfide Enables More Efficient Alkaline Hydrogen Generation

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Reduced graphene oxide decorated with octahedral NiS2/NiS nanocrystals: facile synthesis and tunable high frequency attenuation

Abstract: Reduced graphene oxide (RGO) decorated with octahedral NiS2/NiS nanocrystals were fabricated and they possessed an excellent microwave absorption performance in the high frequency range.

Cited by 54 publications

References 48 publications

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Synthesis of Controllable Nickel Chalcogenide Nano‐Hollow Spheres and Their Tunable Absorbing Properties

Superhydrophobic Ni-Reduced Graphene Oxide Hybrid Coatings with Quasi-Periodic Spike Structures

Swapping Catalytic Active Sites from Cationic Ni to Anionic S in Nickel Sulfide Enables More Efficient Alkaline Hydrogen Generation

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Reduced graphene oxide decorated with octahedral NiS₂/NiS nanocrystals: facile synthesis and tunable high frequency attenuation