Sulfur nanodots as MoS<sub>2</sub> antiblocking agent for stable sodium ion battery anodes

Xu, Zhanwei; Yao, Kai; Li, Zhi; Fu, Licai; Fu, Hao; Li, Jia; Cao, Liyun; Huang, Jianfeng

doi:10.1039/c8ta02339e

Cited by 50 publications

(27 citation statements)

References 51 publications

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“…According to the Randles–Sevcik equation described as follows

i_{p} = (2.69 \times 10^{5}) n^{3 / 2} S D^{1 / 2} ν^{1 / 2} C

where i p (A) is the peak current; n is the transferring electron number (being 1 for Na + ); S (cm 2 ) is the surface electrolyte area (dipped area of the film into the electrolyte solution); D (cm 2 s −1 ) is the diffusion coefficient of Na + in the film; ν (v s −1 ) is the scan rate; and C (mol cm −3 ) is the concentration of Na + . Because n , S , and C values are constants, the value of the diffusion coefficient D is determined by the slope of the peak current( i p ) versus the square root of the sweep rate (ν 1/2 ) in Figure f . As expected, the fitted lines of NMF exhibit larger slope than those of MoS 2 in both cathodic and anodic scans, implying NMF possessed a more rapid ion diffusion process than MoS 2 during the redox reactions.…”

Section: Resultsmentioning

confidence: 64%

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

Peng

Shen

et al. 2019

Adv Materials Inter

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A novel 3D porous foam consisting of interlinking N‐doped MoS2 nanosheets is synthesized through a templating‐drying‐carbonization process, where melamine‐formaldehyde is used as both template and nitrogen source. Benefit from the N‐containing MoS2, 3D porous structure, and residual N‐doped carbon, N‐doped MoS2 foam (NMF) exhibits greatly improved electrochemical performance especially in term of rate capability for sodium storage compared with their pristine counterpart. Specifically, NMF shows outstanding rate capability with high reversible capacities reaching up to 407 mAh g−1 after 100 cycles under a current density of 1 A g−1, whereas the charge capacity of pristine MoS2 quickly decays to 60 mAh g−1 after 35 cycles at the same current density. In addition, the important role of pseudocapacitive behavior in the high rate sodium storage performances of NMF is investigated by kinetics calculation. The band structure and partial density of states of NMF are calculated in order to further explore the change of electronic structure induced by N atom doping in MoS2 and its correlation with high rate performance. Furthermore, a Na+ full‐cell with NMF anode and Na3V2(PO4)3 cathode is assembled and successfully powered a 2 V light‐emitting diode lamp.

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“…According to the Randles–Sevcik equation described as follows

i_{p} = (2.69 \times 10^{5}) n^{3 / 2} S D^{1 / 2} ν^{1 / 2} C

Section: Resultsmentioning

confidence: 64%

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

Peng

Shen

et al. 2019

Adv Materials Inter

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“…In the high‐resolution spectrum of S 2p (Figure c), peaks located at 161.7 and 162.9 eV are corresponding to S 2p 3/2 and 2p 1/2 , respectively. The extra sulfur peaks deconvoluted at 164.1 eV might be due to SC bond, and the fourth at the binding energy 168.5 eV is resulting from SO bond, which can be observed in S‐doped carbon materials . The C 1s peak consists of four carbon components, specifically, a strong peak at 284.6 eV attributed to CC/CC, while the weak peaks are assigned to CS (285.3 eV), COH/COMo (286.2 eV), CO (287.9 eV), and OCO (288.7 eV) .…”

Section: Resultsmentioning

confidence: 99%

α‐Fe₂O₃ Nanoparticles Decorated C@MoS₂ Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na‐Ion Storage

Zhan

et al. 2019

Small

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MoS2 nanosheets as a promising 2D nanomaterial have extensive applications in energy storage and conversion, but their electrochemical performance is still unsatisfactory as an anode for efficient Li+/Na+ storage. In this work, the design and synthesis of vertically grown MoS2 nanosheet arrays, decorated with graphite carbon and Fe2O3 nanoparticles, on flexible carbon fiber cloth (denoted as Fe2O3@C@MoS2/CFC) is reported. When evaluated as an anode for lithium‐ion batteries, the Fe2O3@C@MoS2/CFC electrode manifests an outstanding electrochemical performance with a high discharge capacity of 1541.2 mAh g−1 at 0.1 A g−1 and a good capacity retention of 80.1% at 1.0 A g−1 after 500 cycles. As for sodium‐ion batteries, it retains a high reversible capacity of 889.4 mAh g−1 at 0.5 A g−1 over 200 cycles. The superior electrochemical performance mainly results from the unique 3D ordered Fe2O3@C@MoS2 array‐type nanostructures and the synergistic effect between the C@MoS2 nanosheet arrays and Fe2O3 nanoparticles. The Fe2O3 nanoparticles act as spacers to steady the structure, and the graphite carbon could be incorporated into MoS2 nanosheets to improve the conductivity of the whole electrode and strengthen the integration of MoS2 nanosheets and CFC by the adhesive role, together ensuring high conductivity and mechanical stability.

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“…Preservation of the structure after cycled is an important embodiment of the electrochemical stability of electrode materials . In order to prove the causes of the outstanding electrochemical performance of Na 2 Ti 3 O 7 /C FNFs electrode, the Na half‐cell tested at the current density of 1 C (1 C=177 mA h g −1 ) for 100 cycles was disassembled, and the morphology and microstructure of after‐cycled Na 2 Ti 3 O 7 /C FNFs electrode were observed by TEM.…”

Section: Resultsmentioning

confidence: 99%

Na₂Ti₃O₇/C Nanofibers for High‐Rate and Ultralong‐Life Anodes in Sodium‐Ion Batteries

Nie

Liu

et al. 2018

ChemElectroChem

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Na2Ti3O7/C nanofibers are successfully synthesized through an electrospinning process followed by hydrothermal treatment. The unique structure of these one‐dimensional nanofibers with two‐dimensional nanosheets on the surface is presumed to significantly shorten the diffusion routes for both electrons and ions. Meanwhile, the carbon matrix with a certain degree of graphitization can dramatically improve the overall conductivity. As a result, the Na2Ti3O7/C nanofiber electrode reveals an impressive electrochemical capability as the anode material of sodium‐ion batteries. It demonstrates a reversible capacity of 110 mA h g−1 after 500 cycles at a rate of 1 C. Moreover, with almost no capacity degradation, the discharge capacity of the Na2Ti3O7/C nanofiber electrode remains at 58 mA h g−1 after 1500 cycles at the high rate of 50 C. This superior electrochemical performance places the Na2Ti3O7/C nanofibers as an anode material with great promise for sodium‐ion batteries that could be applied in large‐scale energy storage.

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Sulfur nanodots as MoS₂ antiblocking agent for stable sodium ion battery anodes

Abstract: Sulfur nanodots were employed as efficient antiblocking agent for MoS2 sheets, which thus show significantly enhanced sodium storage performance.

Cited by 50 publications

References 51 publications

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

α‐Fe₂O₃ Nanoparticles Decorated C@MoS₂ Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na‐Ion Storage

Na₂Ti₃O₇/C Nanofibers for High‐Rate and Ultralong‐Life Anodes in Sodium‐Ion Batteries

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Sulfur nanodots as MoS2 antiblocking agent for stable sodium ion battery anodes

Abstract: Sulfur nanodots were employed as efficient antiblocking agent for MoS2 sheets, which thus show significantly enhanced sodium storage performance.

Cited by 50 publications

References 51 publications

Nitrogen‐Doped MoS2 Foam for Fast Sodium Ion Storage

Nitrogen‐Doped MoS2 Foam for Fast Sodium Ion Storage

α‐Fe2O3 Nanoparticles Decorated C@MoS2 Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na‐Ion Storage

Na2Ti3O7/C Nanofibers for High‐Rate and Ultralong‐Life Anodes in Sodium‐Ion Batteries

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Product

Resources

About

Sulfur nanodots as MoS₂ antiblocking agent for stable sodium ion battery anodes

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

Nitrogen‐Doped MoS₂ Foam for Fast Sodium Ion Storage

α‐Fe₂O₃ Nanoparticles Decorated C@MoS₂ Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na‐Ion Storage

Na₂Ti₃O₇/C Nanofibers for High‐Rate and Ultralong‐Life Anodes in Sodium‐Ion Batteries