Formation of Ni-doped MoS2 nanosheets on N-doped carbon nanotubes towards superior hydrogen evolution

Dong, Tian-shun; Zhang, Xiao; Wang, Peng; Chen, Hsueh‐Shih; Yang, Ping

doi:10.1016/j.electacta.2020.135885

Cited by 74 publications

(28 citation statements)

References 41 publications

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“…As shown in Figure c,d, the complete coating layer (Figure c) can be found from the surface of the Zn@ZnNi anode compared with the bare Zn anode, and the good distribution of the ZnNi on the Zn foil was further confirmed by the corresponding Ni mapping (Figure d). In addition, the X-ray photoelectron spectroscopy (XPS) results (Figure e) demonstrate that there appear two peaks at the binding energy of 1044.3 and 1021.3 eV which are ascribed to the Zn 2p 1/2 and Zn 2p 3/2 , respectively. − Figure f displays the signal of the Ni 2p 3/2 located at the binding energy of 851 eV which is consistent with the results of Ni mapping (Figure d). , Notably, the X-ray diffraction (XRD) results (Figure g) prove that the composition of the coating on the Zn@ZnNi anode is Ni 5 Zn 21 alloy.…”

Section: Resultssupporting

confidence: 80%

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Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Cao

Tang

Wei

et al. 2021

ACS Appl. Mater. Interfaces

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The essence of Zn dendrite formation is ultimately derived from Zn nucleation and growth during the repeated Zn plating/stripping process. Here, the nucleation process of Zn has been analyzed using ex situ scanning electron microscopy to explore the formation of the initial Zn dendrite, demonstrating that the formation of tiny protrusions (the initial state of Zn dendrites) is caused by the inhomogeneity of Zn nucleation. Based on this, the uniform Zn nucleation is promoted by the Ni5Zn21 alloy coating (ZnNi) on the surface of Zn foil by electrodeposition, and the mechanism of ZnNi-promoted even nucleation is further analyzed with the assistance of density functional theory (DFT). The DFT results indicate that the ZnNi displays a stronger binding ability to Zn compared to the bare Zn, suggesting that Zn nuclei will preferentially form around ZnNi instead of continuing to grow on the surface of the initial Zn nuclei. Therefore, the designed Zn metal anode (Zn@ZnNi) can be ultra-stable for over 2200 h at a current density of 2 mA cm–2 in the symmetric cell. Even at a much higher current density of 20 mA cm–2, the extra-long life of over 2200 cycles (over 530 h) can be achieved. Moreover, the full cell with the Zn@ZnNi anode exhibits extra-long cycling performance for 500 cycles with a capacity of 207.7 mA h g–1 and 1100 cycles (148.5 mA h g–1) at a current density of 0.5 and 1 A g–1, respectively.

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Section: Resultssupporting

confidence: 80%

“…24−26 Figure 1f displays the signal of the Ni 2p 3/2 located at the binding energy of 851 eV which is consistent with the results of Ni mapping (Figure 1d). 27,28 Notably, the X-ray diffraction (XRD) results (Figure 1g) prove that the composition of the coating on the Zn@ ZnNi anode is Ni 5 Zn 21 alloy.…”

Section: Synthesis and Characterization Of The Znnimentioning

confidence: 91%

Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Cao

Tang

Wei

et al. 2021

ACS Appl. Mater. Interfaces

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“…Two-dimensional transition-metal disulfides, such as tungsten disulfide (WS 2 ) and molybdenum disulfide (MoS 2 ), are promising alternatives toward the HER because of their unique electronic configuration, low cost, and remarkable electrocatalytic stability. , Theoretical and experimental results have demonstrated that their electrocatalytic HER activity is mainly attributed to unsaturated S atoms along the edges, but the high proportion of sulfur atoms in the basal plane is electrochemically inactive, which brings about low atomic utilization efficiency. − Defect engineering through heteroatom doping is widely accepted to trigger new active centers in the electrocatalysts and/or enhance the intrinsic activities of the original active sites, but most of the studies have focused on maximizing edge sites. − Recent investigations have demonstrated that the incorporation of the heteroatoms into MoS 2 can modulate local electronic structure and induce HER activity in the inert basal planes, − but the concomitant transformation of metastable 1T-phase makes it difficult to get insight into the effects of the doped atoms on the catalytic activity of pristine disulfides. ,, Besides, the current exploration for activating basal plane of disulfides mainly focuses on MoS 2 , the improvement of HER activity in WS 2 -based materials is still unsatisfactory, and an overpotential within 100 mV is hard to be achieved at a current density of −10 mA cm –2 . − It is pivotal to develop a new technology to optimize the configuration and electronic structure of WS 2 -based materials for producing high-performance HER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Chemically Activating Tungsten Disulfide via Structural and Electronic Engineering Strategy for Upgrading the Hydrogen Evolution Reaction

Rui

Shen

Shi

et al. 2021

ACS Appl. Mater. Interfaces

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Both improving the intrinsic activity and activating basal plane sites of the layered metal dichalcogenides are desirable to enhance their electrocatalytic performance for energy storage and conversion. Herein, we present palladium (Pd)-doped tungsten disulfide (WS 2 ) epitaxially sheathed around linear tungsten oxide for the hydrogen evolution reaction (HER). The Pd doping is evidenced to tune the electronic structure of WS 2 for activating basal sites of WS 2 , while the unique core−shell structure facilitates charge transfer. The asprepared Pd-WS 2 /W 3 O with 5.65 wt % Pd content exhibits a small overpotential of only 54 mV at −10 mA cm −2 and superior stability in the acidic electrolyte, which are superior to that of the 5 wt % Pt/C benchmark and are unprecedented in the reported WS 2 -based electrocatalysts. Theoretical results have revealed that Pd substituting for W in coordination with four S atoms is thermodynamically stable, and the in-plane S atoms adjacent to the doped Pd represent new catalytic active centers for promoting hydrogen adsorption. This work provides a new multiscale structural and electronic engineering strategy for improving the catalytic performance of transition-metal dichalcogenides.

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“…It is for this reason that in recent years, efforts have been made to increase the efficiency of electrocatalysts for electrolysis in alkaline media through various routes. One of the most interesting routes is the use of nickel-based hybrid electrodes, using organic materials and chalcogenides such as MoS 2 . ,− …”

Section: Introductionmentioning

confidence: 99%

“…Dong et al presented another type of hierarchical composite with MoS 2 and carbon nanotubes (CNTs) as the noble metal-free electrocatalysts for HER, in which the MoS 2 nanosheets with Ni atom incorporation were grown on the surface of nitrogen (N)-doped CNTs. Thus, the MoS 2 nanosheets with enlarged interlayer spacing permit the incorporation of Ni atoms generating abundant unsaturated S atoms in the basal plane, leading to more active sites exposed.…”

Section: Introductionmentioning

confidence: 99%

MoS₂ Effect on Nickel Electrochemical Activation: An Atomistic/Experimental Approach

et al. 2021

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Hybrid Ni–MoS2 electrocatalysts are one of the most promising materials for the generation of hydrogen in an alkaline medium. This paper presents a simple and economical method for the rational synthesis of Ni–MoS2 nanocomposites, maximizing the contact area and reducing the contact resistance between MoS2 and the nickel surface. In this way, it is possible to maximize the synergistic effect between both materials, obtaining a hybrid nanomaterial with high electroactivity toward the generation of hydrogen. A conventional nickel catalyst (NWts) was compared with the one obtained by dispersing a small amount of MoS2 (0.1425 μg cm–2) over the surface denoted as NMS, and with the same type of catalyst after a 10 s electrodeposition of Ni (NMSN), to have a Ni–MoS2–Ni laminar structure. Thus, the NMSN catalyst shows a current density value of 59% higher than the observed value on the NMS catalyst and 113% higher than that found in the conventional NWts catalyst. Finally, these results were analyzed using DFT theoretical studies. DFT calculations predict a charge transfer between MoS2 and nearby Ni atoms, which becomes more important when a second Ni layer is placed on MoS2 explaining the increase in catalytic activity in the NMSN catalyst. Furthermore, the high hydrophobicity of the MoS2 plays an important role in the electrochemically active surface when comparing NMS and NMSN catalysts.

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Formation of Ni-doped MoS2 nanosheets on N-doped carbon nanotubes towards superior hydrogen evolution

Cited by 74 publications

References 41 publications

Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Chemically Activating Tungsten Disulfide via Structural and Electronic Engineering Strategy for Upgrading the Hydrogen Evolution Reaction

MoS₂ Effect on Nickel Electrochemical Activation: An Atomistic/Experimental Approach

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Formation of Ni-doped MoS2 nanosheets on N-doped carbon nanotubes towards superior hydrogen evolution

Cited by 74 publications

References 41 publications

Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Manipulating Uniform Nucleation to Achieve Dendrite-Free Zn Anodes for Aqueous Zn-Ion Batteries

Chemically Activating Tungsten Disulfide via Structural and Electronic Engineering Strategy for Upgrading the Hydrogen Evolution Reaction

MoS2 Effect on Nickel Electrochemical Activation: An Atomistic/Experimental Approach

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MoS₂ Effect on Nickel Electrochemical Activation: An Atomistic/Experimental Approach