Low-temperature molten salt synthesis of MoS<sub>2</sub>@CoS<sub>2</sub> heterostructures for efficient hydrogen evolution reaction

He, Song; Du, Hongfang; Wang, Ke; Liu, Qianchi; Sun, Jianyu; Liu, Yuhang; Du, Zhuzhu; Xie, Linghai; Ai, Wei; Huang, Wei

doi:10.1039/d0cc01726d

Cited by 97 publications

(43 citation statements)

References 32 publications

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“…[29,30] Pristine MoS 2 exhibits Chemistry-A European Journal microspheres morphology consisting of typical thin nanosheets (Figures 1c and S3), and CoS 2 /MoS 2 heterostructure shows a spherelike morphology without agglomeration and coalescence, thereby maximally exposing the edge sites (Figure 1d). [31] Meanwhile, CoS 2 /MoS 2 /PDDA-rGO and CoS 2 /MoS 2 /PDDA-rGO/ PMo 12 show that the surface of PDDA-rGO was evenly covered by different morphology CoS 2 /MoS 2 nanoarrays, due to the influence of PDDA-rGO (Figures 1e and 1 f). And similar morphological features were also applicable to MoS 2 /PDDA-rGO (Figure S4).…”

Section: Resultsmentioning

confidence: 93%

“…Meanwhile, the selected area electron diffraction (SAED) pattern of PDDA‐rGO indicates isolate exfoliated graphene nanosheets in a highly‐crystallized and hexagonal structure (Figure 1b) [29,30] . Pristine MoS 2 exhibits microspheres morphology consisting of typical thin nanosheets (Figures 1c and S3), and CoS 2 /MoS 2 heterostructure shows a spherelike morphology without agglomeration and coalescence, thereby maximally exposing the edge sites (Figure 1d) [31] . Meanwhile, CoS 2 /MoS 2 /PDDA‐rGO and CoS 2 /MoS 2 /PDDA‐rGO/PMo 12 show that the surface of PDDA‐rGO was evenly covered by different morphology CoS 2 /MoS 2 nanoarrays, due to the influence of PDDA‐rGO (Figures 1e and 1 f).…”

Section: Resultsmentioning

confidence: 99%

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Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Wang

et al. 2022

Chemistry A European J

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To address the poor cycling stability and low rate capability of MoS 2 as electrode materials for lithium-ion batteries (LIBs), herein, the CoS 2 /MoS 2 /PDDA-rGO/PMo 12 nanocomposites are constructed via a simple hydrothermal process, combining the advantages of all three, namely, CoS 2 / MoS 2 heterojunction and polyoxometalates (POMs) provide abundant catalytically active sites and increase the multielectron transfer ability, and the positively charged poly(diallyldimethylammonium chloride) modified reduced graphene oxide (PDDA-rGO) improve electronic conductivity and effectively prevent the aggregation of MoS 2 , meanwhile stabilize the negatively charged [PMo 12 O 40 ] 3À . After the electrochemical testing, the resulting CoS 2 /MoS 2 /PDDA-rGO/ PMo 12 nanocomposite achieved 1055 mA h g À 1 initial specific capacities and stabilized at 740 mA h g À 1 after 150 cycles at 100 mA g À 1 current density. And the specific capacities of MoS 2 , MoS 2 /PDDA-rGO, CoS 2 /MoS 2 , and CoS 2 /MoS 2 /PDDA-rGO were 201, 421, 518, and 589 at 100 mA g À 1 after 150 cycles, respectively. The fact of the greatly improving capacity of MoS 2 -based nanocomposites suggests its potential for high performance electrode materials of LIBs. Moreover, the lithium storage mechanism of CoS 2 /MoS 2 /PDDA-rGO/PMo 12 has been discussed on the basis of cyclic voltammetry with different scan rates.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Wang

et al. 2022

Chemistry A European J

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“…Nanosheets of Ru-MoS 2-x -CoS 2 /CC are also clearly observed from transmission electron microscopic (TEM) image ( Figure 2E ), which is consistent with the results of SEM images. According to the high-resolution TEM (HR-TEM) image ( Figure 2F ), the lattice spacings of 0.625 and 0.245 nm that are seen in Ru-MoS 2-x -CoS 2 /CC correspond to the (002) plane of MoS 2 and the (210) plane of CoS 2 ( He et al, 2020 ; Liu X. et al, 2022 ), respectively. These also conform to the results of XRD.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Regulation of S-Vacancy of MoS2-Based Materials for Highly Efficient Electrocatalytic Hydrogen Evolution

Zhu

Wang

et al. 2022

Front. Chem.

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Low or excessively high concentration of S-vacancy (CS-vacancy) is disadvantageous for the hydrogen evolution reaction (HER) activity of MoS2-based materials. Additionally, alkaline water electrolysis is most likely to be utilized in the industry. Consequently, it is of great importance for fine-tuning CS-vacancy to significantly improve alkaline hydrogen evolution. Herein, we have developed a one-step Ru doping coupled to compositing with CoS2 strategy to precisely regulate CS-vacancy of MoS2-based materials for highly efficient HER. In our strategy, Ru doping favors the heterogeneous nucleation and growth of CoS2, which leads to a high crystallinity of Ru-doped CoS2 (Ru-CoS2) and rich heterogeneous interfaces between Ru-CoS2 and Ru-doped MoS2-x (Ru-MoS2-x). This facilitates the electron transfer from Ru-CoS2 to Ru-MoS2-x, thereby increasing CS-vacancy of MoS2-based materials. Additionally, the electron injection effect increases gradually with an increase in the mass of Co precursor (mCo), which implies more S2- leaching from MoS2 at higher mCo. Subsequently, CS-vacancy of the as-synthesized samples is precisely regulated by the synergistic engineering of Ru doping and compositing with CoS2. At CS-vacancy = 17.1%, a balance between the intrinsic activity and the number of exposed Mo atoms (EMAs) to boost highly active EMAs should be realized. Therefore, the typical samples demonstrate excellent alkaline HER activity, such as a low overpotential of 170 mV at 100 mA cm−2 and a TOF of 4.29 s−1 at -0.2 V. Our results show promise for important applications in the fields of electrocatalysis or energy conversion.

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“…So, high-efficiency and stable OER catalysts can be the key factor to accelerate reaction rate and improve energy conversion efficiency. [2] Currently, precious metal catalysts (such as Ir, Ru and Pd) have been demonstrated that they can prove the reaction rates and low the overpotentials of OER. But the high price of these metals limits the large-scale applications of water splitting.…”

Section: Introductionmentioning

confidence: 99%

Steel Mesh Reinforced Ni(OH)2 Nanosheets with Enhanced Oxygen Evolution Reaction Performance

Shen¹,

Kong²

2021

ES Mater. Manuf.

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Water splitting is one of the most promising technology to solve the current energy and environmental issues. The high overpotential and sluggish kinetics of the oxygen evolution reaction (OER) seriously hinders the energy conversion efficiency of the full water splitting. Therefore, it is of great significance to develop high-active and stable OER catalytic materials for improving the energy transfer efficiency and durability. In this work, we prepared the Ni(OH)2/stainless steel wire mesh (SSWM) self-supporting electrode by a simple one-step method. This in-situ growth method can accurate controllability for improving activity of the catalysts, efficaciously inhibit the self-aggregation of Ni(OH)2, and the obtained two-dimensional array of oriented nanosheets can quickly promote the acquisition of electrolytes and gas release. The integrated Ni(OH)2/SSWM electrodes possess prominent conductivity, abundant porous structure and high specific surface area. As OER catalysts, this obtained electrodes exhibit the relatively low overpotential of 223 mV and low Tafel slope of 25.2 mV dec -1 at 10 mA cm -2 . Moreover, the integrated Ni(OH)2/SSWM electrodes possess stable long-term performance (60 hours). Therefore, this research provides a novel strategy for large-scale production of highly active integrated OER electrodes.

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Low-temperature molten salt synthesis of MoS₂@CoS₂ heterostructures for efficient hydrogen evolution reaction

Abstract: A facile low-temperature molten salt approach has been successfully developed to construct MoS2@CoS2 heterostructures for high-efficiency hydrogen evolution reaction.

Cited by 97 publications

References 32 publications

Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Synergistic Regulation of S-Vacancy of MoS2-Based Materials for Highly Efficient Electrocatalytic Hydrogen Evolution

Steel Mesh Reinforced Ni(OH)2 Nanosheets with Enhanced Oxygen Evolution Reaction Performance

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Low-temperature molten salt synthesis of MoS2@CoS2 heterostructures for efficient hydrogen evolution reaction

Abstract: A facile low-temperature molten salt approach has been successfully developed to construct MoS2@CoS2 heterostructures for high-efficiency hydrogen evolution reaction.

Cited by 97 publications

References 32 publications

Nanohybridization of CoS2/MoS2 Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Nanohybridization of CoS2/MoS2 Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Synergistic Regulation of S-Vacancy of MoS2-Based Materials for Highly Efficient Electrocatalytic Hydrogen Evolution

Steel Mesh Reinforced Ni(OH)2 Nanosheets with Enhanced Oxygen Evolution Reaction Performance

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Resources

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Low-temperature molten salt synthesis of MoS₂@CoS₂ heterostructures for efficient hydrogen evolution reaction

Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs

Nanohybridization of CoS₂/MoS₂ Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High‐Performance LIBs