Chloride functionalized carbon nanotube sponge: High charge capacity and high magnetic saturation

Fajardo‐Díaz, Juan L.; López–Urías, Florentino; Muñoz‐Sandoval, Emilio

doi:10.1016/j.carbon.2020.04.016

Cited by 23 publications

(11 citation statements)

References 73 publications

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“…Therefore, its appearance is associated with transitions in carbon atoms of the WC 1-x coating layer. The weak peak energy B corresponds to the binding energy of the C1 electron in the C=O group [83,84], the presence of which in the nanocomposite is confirmed by NEXAFS spectroscopy data (Figure 7a).…”

Section: Xps Research Of the Nanocomposites And Initial Mwcntsmentioning

confidence: 65%

“…Therefore, its appearance is associated with transitions in carbon atoms of the WC1-x coating layer. The weak peak energy B' corresponds to the binding energy of the C1 electron in the C=O group [83,84], the presence of which in the nanocomposite is confirmed by NEXAFS spectroscopy data (Figure 7a). It is significant that the relative carbon atoms amount in the C=O compound with respect to carbon atoms on the nanotube surface, determined by the ratio of the areas of the peaks A and B' in the WC1-x/MWCNT C1 spectrum (4.7%), is twice as large than the oxygen atoms proportion in the oxides adsorbed on the initial nanotube surface (2.3%).…”

Section: Xps Research Of the Nanocomposites And Initial Mwcntsmentioning

confidence: 65%

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Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

et al. 2020

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Currently, X-ray photoelectron spectroscopy (XPS) is widely used to characterize the nanostructured material surface. The ability to determine the atom distribution and chemical state with depth without the sample destruction is important for studying the internal structure of the coating layer several nanometers thick, and makes XPS the preferable tool for the non-destructive testing of nanostructured systems. In this work, ultra-soft X-ray spectroscopy methods are used to study hidden layers and interfaces of pyrolytic tungsten carbide nanoscale coatings on the multi-walled carbon nanotube (MWCNT) surfaces. XPS measurements were performed using laboratory spectrometers with sample charge compensation, and Near Edge X-ray Absorption Fine Structure (NEXAFS) studies using the Russian–German dipole beamline (RGBL) synchrotron radiation at BESSY-II. The studied samples were tested by scanning and transmission electron microscopy, X-ray diffractometry, Raman scattering and NEXAFS spectroscopy. It was shown that the interface between MWCNT and the pyrolytic coating of tungsten carbide has a three-layer structure: (i) an interface layer consisting of the outer graphene layer carbon atoms, forming bonds with oxygen atoms from the oxides adsorbed on the MWCNT surface, and tungsten atoms from the coating layer; (ii) a non-stoichiometric tungsten carbide WC1-x nanoscale particles layer; (iii) a 3.3 nm thick non-stoichiometric tungsten oxide WO3-x layer on the WC1-x/MWCNT nanocomposite outer surface, formed in air. The tungsten carbide nanosized particle’s adhesion to the nanotube outer surface is ensured by the formation of a chemical bond between the carbon atoms from the MWCNT upper layer and the tungsten atoms from the coating layer.

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Section: Xps Research Of the Nanocomposites And Initial Mwcntsmentioning

confidence: 65%

Section: Xps Research Of the Nanocomposites And Initial Mwcntsmentioning

confidence: 65%

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

et al. 2020

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“…From the XRD results of contraction and swell between C‐NiFe LDH, ML‐NiFe LDH, and M‐NiFe LDH, the negative shift of the binding energy could be attributed to bond contraction, and the positive shift of the binding energy could be attributed to bond swell. Besides, the peak that emerges at 709 eV in the ML‐NiFe LDH could be attributed to the Fe–C bond 45 . Corresponding Fe–C peaks could be found in C 1s of ML‐NiFe LDH and M‐NiFe LDH at 283.2 eV.…”

Section: Results and Disscusionmentioning

confidence: 87%

“…Besides, the peak that emerges at 709 eV in the ML-NiFe LDH could be attributed to the Fe-C bond. 45 Corresponding Fe-C peaks could be found in C 1s of ML-NiFe LDH and M-NiFe LDH at 283.2 eV. Lattice contraction is attributed to the pressure applied by iron atoms due to a strong interaction in the Fe-C bond.…”

Section: Results and Disscusionmentioning

confidence: 88%

Microcrystallization and lattice contraction of NiFe LDHs for enhancing water electrocatalytic oxidation

Zheng

Chen

et al. 2022

Carbon Energy

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“…As next discussed, a certain correlation is found between these with, for example the combination of high oxygen and nitrogen surface species resulting in highest coulombic efficiencies attained. [ 52 ] The spectral‐deconvolution of O 1s signal indicates the presence of different type of oxygen functional groups and content. The signal of C─O─C, C─O/COO − and C═O bonds is important in all CNXs samples, but particularly enhanced in CNX2 and CNX3.…”

Section: Resultsmentioning

confidence: 99%

N‐doped carbon nanotube sponges and their excellent lithium storage performances

et al. 2021

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Preparation, analysis and lithium storage performance of a series of nitrogen‐doped carbon nanotube sponges (CNX) is presented in this work. The synthesis was performed using an aerosol‐assisted chemical vapor deposition (AACVD) in a bi‐sprayer system by using various carbon and nitrogen precursors made of mixtures of benzylamine with toluene, urea, pyridine and 1,2‐dichlorbenzene, with ferrocene as catalyst. A series of physico‐chemical analysis techniques are used to characterize the composition and the morphology of the obtained materials, and a correlation of these with the lithium storage performances is attempted. The samples reveal an interconnected core‐shell CNX fiber morphology with a CNT‐core surrounded by an amorphous carbon shell. Appealing lithium storage performances are attained, while also considering aspects of safety, low potential, and long‐term cycling stability. The best performing sponges display a high specific capacity (223 mAh g−1) when cycled in a practically relevant voltage window (0.01–1V vs. Li), high first cycle (90%) and long‐term cycling (99.3%) coulombic efficiencies and excellent capacity retention after 1500 cycles. This study further analyses the interplay between the morphology and the physico‐chemistry of nitrogen‐doped carbon nanotube materials for Lithium storage and provides guidelines for future developments.

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Chloride functionalized carbon nanotube sponge: High charge capacity and high magnetic saturation

Cited by 23 publications

References 73 publications

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

Microcrystallization and lattice contraction of NiFe LDHs for enhancing water electrocatalytic oxidation

N‐doped carbon nanotube sponges and their excellent lithium storage performances

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