Infrared and Raman Spectroscopic Study of Carbon‐Cobalt Composites

Tembre, André; Henocque, J.; Clin, M.

doi:10.1155/2011/186471

Cited by 12 publications

(10 citation statements)

References 50 publications

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“…The intensity ratio I D / I G increases from 1.71 to 1.90 (Table ) with increasing vanadium loading, suggesting the presence of VN increases the disorder of HC. That is consistent with previous reports of introducing metallic atoms to the amorphous substrate . There are no obvious strong peaks below 1000 cm –1 (Figure S4), which would have been expected to be observed if significant vanadium oxide was present.…”

Section: Results and Discussionsupporting

confidence: 93%

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Cheng

Garcı́a-Aráez

Hector

2020

ACS Appl. Energy Mater.

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A promising material for sodium-ion battery anodes has been developed through the controlled formation of a thin, uniformly dispersed layer of vanadium nitride (VN) nanoparticles onto a high-performance hard carbon. Hard carbon is the standard (pre)commercial material for sodium-ion negative electrodes, and our hard carbon electrodes exhibit an electrochemical performance comparable to the state-of-the-art. The introduction of VN produces an increased capacity: with addition of 8.6 wt % VN, the hard carbon-based electrode achieves a first cycle reversible (oxidation, desodiation) capacity of 354 mA h g–1 at 50 mA g–1, while with pure hard carbon it is 302 mA h g–1. The additional specific capacity achieved upon addition of VN, compared with the pure hard carbon, is 605 mA h g–1 when referred to the mass of VN only, which is the highest capacity of VN materials in sodium-ion batteries reported to date. In addition, VN also improves the capacity retention with cycling: after 50 cycles the reversible capacity of hard carbon electrodes with 8.6 wt % VN is 294 mA h g–1, while with pure hard carbon it is 239 mA h g–1. This promising new material is obtained via a new and easily scalable synthesis method in which cotton wool is reacted with a vanadium source (VOCl3), followed by a single firing step in N2. Insights into the reaction mechanism are obtained by ex situ characterization of the discharged and charged electrodes.

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Section: Results and Discussionsupporting

confidence: 93%

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Cheng

Garcı́a-Aráez

Hector

2020

ACS Appl. Energy Mater.

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“…This suggests that the presence of TiN or TiC in the composites increases disorder, in accordance previous reports of introducing metallic atoms to an amorphous substrate. 66,67 There are no obvious strong peaks between 300 and 600 cm -1 , where the presence of any titanium dioxide would be expected to produce strong peaks (supplementary information, Fig. S7).…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Hard Carbon-TiN/TiC Composites by Reacting Cellulose with TiCl₄ Followed by Carbothermal Nitridation/Reduction

et al. 2019

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Titanium tetrachloride is reacted with hydroxide groups on cellulose (cotton wool) before firing to convert the cellulose to hard carbon. Hard carbon-nanocrystalline titanium nitride composites with a good distribution of the titanium across the fibrous hard carbon structure were obtained by firing the treated cellulose under nitrogen. Hard carbon-nanocrystalline titanium carbide composites were obtained by firing under argon. The composites were tested as anode materials for sodium ion batteries and the HC-TiN composite delivers a better capacity retention than that of hard carbon over 50 cycles. The synthesis method demonstrated here provides an effective route to composites of metal nitrides and carbides with carbon that may be of interest for other energy technologies as well as for sodium batteries.

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“…87 The small peak observed at 1990 cm À1 can be assigned to the linear alignment of CoC 3 . 88 Another small peak was observed at 1360 cm À1 which resulted due to the symmetric stretching of COO Fe bond. 89 A minor peak was observed at 848 cm À1 which may be assigned to in-plane bending vibrations of SrCO 3 .…”

Section: Spent Catalyst Characterizationmentioning

confidence: 99%

Synthesis of cobalt loaded double perovskite Sr ₂ TiFeO ₆ _‐δ ( STF ) as a stable catalyst for enhanced hydrogen production via methane decomposition

et al. 2021

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In this study, cobalt (Co) loaded Sr 2 TiFeO 6-δ (STF) double perovskite was synthesized using a modified nitrate combustion method for the application in catalytic decomposition of methane (CH 4 ) for hydrogen (H 2 ) production in a fixed bed reactor. The physicochemical properties of the catalyst were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energydispersive X-ray spectroscopy, N 2 adsorption-desorption, thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy. The catalyst showed a stable crystalline behavior with a uniform dispersion of Co over STF. The different compositions with varying Co loading were tested for methane decomposition at 850 C and constant flow rate. The 5% Co/STF achieving a maximum CH 4 conversion of ~95% with an H 2 yield of ~49%. Five percentage Co/STF showed excellent catalytic activity and stability for 46.5 hours time on stream without any indication of performance degradation. The spent catalyst was also analyzed using XRD, SEM, and TGA. The carbon deposited is shaped as carbon nanotubes that are a byproduct and also assist in metal exsolution in high-temperature processes. The use of STF shows the excellent potential showed by perovskites, which are stable in reducing environments, as support materials for methane decomposition.

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Infrared and Raman Spectroscopic Study of Carbon‐Cobalt Composites

Cited by 12 publications

References 50 publications

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Synthesis of Hard Carbon-TiN/TiC Composites by Reacting Cellulose with TiCl₄ Followed by Carbothermal Nitridation/Reduction

Synthesis of cobalt loaded double perovskite Sr ₂ TiFeO ₆ _‐δ ( STF ) as a stable catalyst for enhanced hydrogen production via methane decomposition

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Infrared and Raman Spectroscopic Study of Carbon‐Cobalt Composites

Cited by 12 publications

References 50 publications

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Synthesis of Vanadium Nitride–Hard Carbon Composites from Cellulose and Their Performance for Sodium-Ion Batteries

Synthesis of Hard Carbon-TiN/TiC Composites by Reacting Cellulose with TiCl4 Followed by Carbothermal Nitridation/Reduction

Synthesis of cobalt loaded double perovskite Sr 2 TiFeO 6 ‐δ ( STF ) as a stable catalyst for enhanced hydrogen production via methane decomposition

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Product

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Synthesis of Hard Carbon-TiN/TiC Composites by Reacting Cellulose with TiCl₄ Followed by Carbothermal Nitridation/Reduction

Synthesis of cobalt loaded double perovskite Sr ₂ TiFeO ₆ _‐δ ( STF ) as a stable catalyst for enhanced hydrogen production via methane decomposition