Preparation of cobalt sulfide@reduced graphene oxide nanocomposites with outstanding electrochemical behavior for lithium-ion batteries

Wang, Junhai; Zhang, Yongxing; Wang, Jun; Gao, Lvlv; Jiang, Zinan; Ren, Haibo; Huang, Jiarui

doi:10.1039/d0ra01351j

Cited by 13 publications

(8 citation statements)

References 58 publications

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“…Determination of Mn and Co is stymied somewhat by multiple splitting caused by paramagnetic interactions with unpaired d-electrons during photoemission, which is a facet that complicates the analysis of 2p photoelectron spectra from first row transition metals in general . The position of the Mn 2p 3/2 peak at 641.2 eV is as expected comparing to literature on MnS and similarly the principle peak for Co 2p 3/2 at 778.2 eV for cobalt sulfide . However, other peaks are also evident (e.g., some structure in Co 2p 3/2 has a peak at 780.7 eV) again indicating a small amount of oxidation or potentially sulfate …”

Section: Resultssupporting

confidence: 87%

“…40 The position of the Mn 2p 3/2 peak at 641.2 eV is as expected comparing to literature on MnS 41 and similarly the principle peak for Co 2p 3/2 at 778.2 eV for cobalt sulfide. 42 However, other peaks are also evident (e.g., some structure in Co 2p 3/2 has a peak at 780.7 eV) again indicating a small amount of oxidation or potentially sulfate. 42 The S 2p spectrum requires three chemical species (each a spin−orbit split doublet) in order to adequately fit the data, with S 2p 3/2 binding energies of 161.3 (60% of the total intensity), 163.8 (31%), and 168.1 eV (9%).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

Xiao,

Li,

Elgendy

et al. 2023

Chem. Mater.

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High entropy metal chalcogenides are materials containing five or more elements within a disordered sublattice. These materials exploit a high configurational entropy to stabilize their crystal structure and have recently become an area of significant interest for renewable energy applications such as electrocatalysis and thermoelectrics. Herein, we report the synthesis of bulk particulate HE zinc sulfide analogues containing four, five, and seven metals. This was achieved using a molecular precursor cocktail approach with both transition and main group metal dithiocarbamate complexes which are decomposed simultaneously in a rapid (1 h) and low-temperature (500 °C) thermolysis reaction to yield high entropy and entropy-stabilized metal sulfides. The resulting materials were characterized by powder XRD, SEM, and TEM, alongside EDX spectroscopy at both the micro-and nanoscales. The entropy-stabilized (CuAgZnCoMnInGa)S material was demonstrated to be an excellent electrocatalyst for the hydrogen evolution reaction when combined with conducting carbon black, achieving a low onset overpotential of (∼80 mV) and η 10 of (∼255 mV).

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Section: Resultssupporting

confidence: 87%

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

Xiao,

Li,

Elgendy

et al. 2023

Chem. Mater.

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“…54 However, for Figure 4d, the high loading of CoS nanoparticles (30%) may minimize the aggregation of carbon nanotubes in the crystalline matrix, which explains the attenuation of the peak intensity at 26°. 55 The XRD spectra further confirm growth of CoS on MWCNTs in the composites. 40,56 The presence of the C−S chemical bond suggested that CoS interacts strongly with MWCNTs.…”

Section: Resultsmentioning

confidence: 64%

“…The low peak intensity of (002) carbon of 10% CoS@MWCNTs (Figure a) may be attributed to the orientation of carbon nanotubes . However, for Figure d, the high loading of CoS nanoparticles (30%) may minimize the aggregation of carbon nanotubes in the crystalline matrix, which explains the attenuation of the peak intensity at 26° . The XRD spectra further confirm growth of CoS on MWCNTs in the composites.…”

Section: Resultsmentioning

confidence: 77%

Facile Synthesis of CoS Nanoparticles Anchored on the Surface of Functionalized Multiwalled Carbon Nanotubes as Cathode Materials for Advanced Li–S Batteries

Wang

Zeng

2022

Ind. Eng. Chem. Res.

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The effects of CoS loading (10, 20, and 30%) on multiwalled carbon nanotubes (MWCNTs) on electrochemical performance for Li−S batteries were investigated. A facile hydrothermal method was used to grow CoS nanoparticles in situ on the surface of MWCNTs. In addition, CoS on functionalized multiwalled carbon nanotubes (f-MWCNTs) was also investigated. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Xray photoelectron spectroscopy were used to characterize the structure and electronic state of CoS on the surface of MWCNTs and f-MWCNTs. The initial discharge capacities and reversible specific capacities after 200 cycles were found to be 980 and 612 mAh/g, 990 and 707 mAh/g, and 959 and 658 mAh/g for the 10, 20, and 30% CoS samples, respectively. Interestingly, the 20% CoS@MWCNTs show the best initial discharge capacity and retention after 200 cycles. This finding can be attributed to the fact that high CoS loading (30%) may not be dispersed evenly on the MWCNT surface, while low CoS loading (10%) leads to fewer CoS and weaker adsorption for polysulfides. Moreover, the 20% CoS/f-MWCNTs show even higher initial discharge capacities of 1103 mAh/g and reversible specific capacities of 796 mAh/g after 200 cycles. This can be attributed to a rougher surface with more active sites on f-MWCNTs for trapping polysulfides and for enhancing the electronic conductivity of the cathode composite. X-ray photoelectron spectroscopy (XPS) spectra show prominent peaks at 162.7 and 163.9 eV, which correspond to Co−S and C−S bonds, respectively, suggesting that CoS bonds well with MWCNTs. It is postulated that CoS/f-MWCNTs play a role in adsorbing lithium polysulfides (LPS) during the charge and discharge process and accelerating the kinetics of polysulfide conversion.

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“…13 It is seen that the increasing S-content gives a lead to increase in the capacity of the Li-ion cells. Although the cobalt sulfides have a better theoretical capacity than that of the graphite, 14 the main problem of these materials for Li-ion cells is the volume effect, resulting in poor cycle performance and showing the high capacity fade. To minimize this volume effect, researchers have found a solution to modify TMSs.…”

Section: Introductionmentioning

confidence: 99%

High‐performance electrodes for Li‐ion cell: Heteroatom‐doped porous carbon/ CoS structure and investigation of their structural and electrochemical properties

Buğday

Altın

et al. 2022

Intl J of Energy Research

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Summary As an essential class of anode materials, the synthesis and characterization of CoS@ZIF‐12‐C composite anode materials are reported. The two‐step synthesis of CoS nanoparticles embedded in N‐doped porous carbon by using a metal‐organic framework (MOF) as the template. After structural characterization of CoS@ZIF‐12‐C composite materials, the main phase was found as CoS with symmetry of P63mmc. Benefiting from the CoS embedded in porous carbon structure, the half Li‐ion battery cell tests of CoS@ZIF‐12‐C composite materials were performed by a 2‐electrode method using CR2032 cells, and the capacities of the cells were measured for 200 cycles using 300 mAg−1 and 500 cycles using 1000 mAg−1. The first discharge capacities of the cells for 1000 mAg−1 were found as 458, 1178, and 815 mAhg−1 for CoS@ZIF‐12‐C‐T, T = 700, 800, and 900°C, respectively. An unexpected capacity increase was observed for the CoS@ZIF‐12‐C‐700 and CoS@ZIF‐12‐C‐900 half cells during the cycling. Ex‐situ x‐ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and cyclic voltammetry (CV) analysis were performed after cycling of the cells for explanations of the capacity increase. Ex‐situ XRD analysis of these cells showed phase transitions from crystalline to amorphous type structure, and ex‐situ FTIR proves the preservation of the CoS phase during the cycling. A redox reaction mechanism was suggested to explain the cells' battery performance by ex‐situ XRD analysis.

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Preparation of cobalt sulfide@reduced graphene oxide nanocomposites with outstanding electrochemical behavior for lithium-ion batteries

Abstract: Cobalt sulfide@reduced graphene oxide nanocomposites obtained through a dipping and hydrothermal process, exhibit ascendant lithium-ion storage properties.

Cited by 13 publications

References 58 publications

Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

Facile Synthesis of CoS Nanoparticles Anchored on the Surface of Functionalized Multiwalled Carbon Nanotubes as Cathode Materials for Advanced Li–S Batteries

High‐performance electrodes for Li‐ion cell: Heteroatom‐doped porous carbon/ CoS structure and investigation of their structural and electrochemical properties

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