3D graphene encapsulated ZnO-NiO-CuO double-shelled hollow microspheres with enhanced lithium storage properties

Yang, Jingren; Zeng, Deqian; Zheng, Hongfei; Xie, Qingshui; Huang, Jian; Xiao, Lang; Peng, Dong‐Liang

doi:10.1016/j.jallcom.2018.06.253

Cited by 20 publications

(8 citation statements)

References 55 publications

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“…present the O 1s, Fe 2p, Mn 2p, and Cu 2p spectra of the ferrite nanozyme, respectively. The peaks at 529.2 and 531.58 eV originate from the oxygen atoms in the ferrite nanozyme sample (Figure g). , Figure h shows the Fe 2p XPS spectrum of ferrite nanozyme sample with two binding energies at 710.2 eV (Fe 2p 3/2 ) and 723.8 eV (Fe 2p 1/2 ), which are assigned to Fe 3+ . − High-resolution spectra of Mn 2p in ferrite nanozyme are deconvoluted into Mn 2p 3/2 and Mn 2p 1/2 , with binding energies at 640.0 and 651.5 eV, respectively (Figure i). − Figure j shows the high-resolution XPS spectra of Cu 2p, which are deconvoluted into Cu 2p 3/2 and Cu 2p 1/2 , with binding energies at 932.5 and 952.3 eV, respectively. − …”

Section: Resultsmentioning

confidence: 99%

Mechanism and Application of Surface-Charged Ferrite Nanozyme-Based Biosensor toward Colorimetric Detection of l-Cysteine

Liu

Chen

et al. 2022

Langmuir

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Peroxidase-like nanozymes with robust catalytic capacity and detection specificity have been proposed as substitutes to natural peroxidases in biochemical sensing. However, the catalytic activity enhancement, detection mechanism, and application of nanozyme-based biosensors toward L-cysteine (L-Cys) detection still remain significant challenges. In this work, a doped ferrite nanozyme with well-defined structure and surface charges is fabricated by a two-step method of continuous flow coprecipitation and high-temperature annealing. The resulted ferrite nanozyme possesses an average size of 54.5 nm and a zeta-potential of 6.45 mV. A high-performance biosensor is manufactured based on the peroxidase-like catalytic feature of the doped ferrite. The ferrite nanozyme can oxidize the 3,3′,5,5′tetramethylbenzidine (TMB) with the assistance of H 2 O 2 because of the instinctive capacity to decompose H 2 O 2 into •OH. The Michaelis−Menten constants (0.0911 mM for TMB, 0.140 mM for H 2 O 2 ) of the ferrite nanozyme are significantly smaller than those of horseradish peroxidase. A reliable colorimetric method is established to selectively analyze L-Cys via a facile mixing-anddetecting methodology. The detection limit and linear range are 0.119 μM and 0.2−20 μM, respectively. Taking the merits of the ferrite nanozyme-based biosensors, the L-Cys level in the human serum can be qualitatively detected. It can be anticipated that the surface-charged ferrite nanozyme shows great application prospects in the fields of bioanalytical chemistry and point-of-care testing.

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Section: Resultsmentioning

confidence: 99%

Mechanism and Application of Surface-Charged Ferrite Nanozyme-Based Biosensor toward Colorimetric Detection of l-Cysteine

Liu

Chen

et al. 2022

Langmuir

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“…The above-mentioned standard JCPDS XRD file card numbers for respected metal oxides are wellmatched with the corresponding crystallographic planes XRD patterns of double-and triple-metal-oxide nanocomposites. 25,26 It ensures that all these samples are pristine, because of the absence of impurity peaks. These results perspicuously confirmed the formation of ZnO−NiO−CuO MMOs.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Performances of ZnO–NiO–CuO Mixed Metal Oxides as Smart Electrode Material for Solid-State Asymmetric Device Fabrication

Packiaraj

Mahendraprabhu²,

Devendran

et al. 2021

Energy Fuels

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Mixed transition-metal oxides are emerging electrode materials, because of their higher electrochemical performances. In the present work, single-metal oxides, binary-metal oxides, and ternary mixed-metal oxides (MMOs) of zinc oxide (ZnO), nickel oxide (NiO), and copper oxide (CuO) are successfully prepared by simple gel-combustion process. The structure and properties of MMOs are of great interest, because of the opportunity to tune their properties for better multifunctional performance than single and binary metal oxides. The crystal structure, functional group, surface morphology, and binding energy of all of the single, binary, and ternary MMOs are studied through X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron microscopy (XPS), respectively. The entire electrochemical studies are also performed using cyclic voltammetry (CV), galvanostatic charge−discharge (GCD), and electrochemical impedance spectroscopy (EIS). From the electrochemical study, the ZnO−NiO−CuO MMOs electrode was found to possess pseudocapacitor-type features and shows an outstanding specific capacitance of 1831 F g −1 at a current density of 1 A g −1 , which is higher than that of single and binary metal oxides. The fabricated asymmetric (ASC) device [ZnO−NiO−CuO MMOs || r-GO] exhibits maximum specific capacitance of 118 F g −1 at the current density of 1 A g −1 . Hence, it leads to the supercapacitance property of maximum storage response; the ASC device possessed the excellent retentivity of (89.97%) up to 10 000 repeated cycles. The ASC device reveals a maximum specific power of 5672 W h kg −1 with a specific energy of 15.7 W h kg −1 with a high current density of 10 A g −1 . This finding shows that the ZnO−NiO−CuO MMOs can be used as potential electrode material and might have promising applications in high-performance energy storage devices.

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“…In the Cu 2p 3/2 spectra shown in Figure b, there are two peaks centered at 932.8 and 935.2 eV, which were assigned to the binding energy (BE) of (Cu 0 + Cu + ) and Cu 2+ , respectively . The characteristic peak positions and content of different copper species are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

“…In the Cu 2p 3/2 spectra shown in Figure 7b, there are two peaks centered at 932.8 and 935.2 eV, which were assigned to the binding energy (BE) of (Cu 0 + Cu + ) and Cu 2+ , respectively. 50 The characteristic peak positions and content of different copper species are summarized in Table 4. As for the Cu@NG/C-700 catalyst, the characteristic peak of (Cu 0 + Cu + ) was located at 933.1 eV, shifted by about 0.3 eV to higher BE than the other catalysts, which could be related to the strong interaction between the copper species and the NG encapsulation layer as well as the significantly smaller size of the Cu particles.…”

Section: Methodsmentioning

confidence: 99%

Carbon-Supported Nitrogen-Doped Graphene-Wrapped Copper Nanoparticles: An Effective Catalyst for the Oxidative Carbonylation of Methanol

Shi

Zhao

Quan

et al. 2021

Ind. Eng. Chem. Res.

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Wrapping metal nanoparticles (NPs) in graphene shells has emerged as a promising strategy to design highly active and stable catalysts. A facile direct co-pyrolysis approach was proposed to prepare a carbon-supported nitrogen-doped graphene-coated copper NP composite (Cu@NG/C) to catalyze the oxidative carbonylation of methanol to dimethyl carbonate (DMC) effectively. Compared with a carbon-supported copper catalyst (Cu/C) without graphene coating, the optimized Cu@NG/C-700 catalyst has a grain size of Cu NPs of around 15.2 nm with an NG layer thickness of ∼2.0 nm and exhibits high catalytic activity (DMC space time yield, 1881 mg·g–1·h–1) and excellent stability after five reaction cycles. The NG shell allows the diffusion of the reactant and product molecules while acting as a layer of protection to prevent leaching and agglomeration of Cu NPs. In addition, the introduction of nitrogen strongly increased the charge transfer carrier density and therefore promoted the absorption of CO on the active copper sites. The confinement effect of the NG wrapping layer markedly enhanced the catalytic performance of the copper cores in methanol oxidative carbonylation, which may have great potential in fabricating advanced carbon-supported metal catalysts.

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3D graphene encapsulated ZnO-NiO-CuO double-shelled hollow microspheres with enhanced lithium storage properties

Cited by 20 publications

References 55 publications

Mechanism and Application of Surface-Charged Ferrite Nanozyme-Based Biosensor toward Colorimetric Detection of l-Cysteine

Mechanism and Application of Surface-Charged Ferrite Nanozyme-Based Biosensor toward Colorimetric Detection of l-Cysteine

Electrochemical Performances of ZnO–NiO–CuO Mixed Metal Oxides as Smart Electrode Material for Solid-State Asymmetric Device Fabrication

Carbon-Supported Nitrogen-Doped Graphene-Wrapped Copper Nanoparticles: An Effective Catalyst for the Oxidative Carbonylation of Methanol

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