Interface Engineered WxC@WS2 Nanostructure for Enhanced Hydrogen Evolution Catalysis

Wang, Fengmei; He, Peng; Li, Yuanchang; Shifa, Tofik Ahmed; Deng, Youwen; Liu, Kaili; Wang, Qisheng; Wen, Yao; Wang, Zhenxing; Zhan, Xueying; Sun, Lianfeng; He, Jun

doi:10.1002/adfm.201605802

Cited by 140 publications

(114 citation statements)

References 49 publications

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“…HAADF‐STEM image and corresponding EDS mapping of C, W, and S elements, taken from WS 2 @CNFs‐3 (Figure g), confirm the hierarchical structure with WS 2 nanosheets embedded in CNFs and a homogeneous distribution of W and S elements in the WS 2 nanosheets. Based on representative high‐resolution TEM (HRTEM) images (Figure h, i), it is recognized that the embedded WS 2 nanosheets are composed of few layers (4–10 layers), and the interlayer spacing of nanosheets embedded in amorphous CNFs is measured as 0.62 nm, identified as the (002) plane of hexagonal WS 2 . The strong contact between WS 2 nanosheets and CNFs is beneficial to the rapid electron transfer throughout the interfaces and the whole membrane.…”

Section: Resultsmentioning

confidence: 99%

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

Zeng

Chen

et al. 2017

Adv Materials Inter

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characteristics such as quantum confinement and surface effect, indicating great promise as LIB electrodes. [3,4] As a typical TMDs, WS 2 has gained tremendous attention because it possesses a higher theoretical specific capacity (433 mA h g −1 ) and a larger interlayer spacing of 0.64 nm than graphite, which contributes to more space for lithium-ion transport, consequently leading to superior property. [5,6] However, large volume change during charge/discharge process and poor conductivity lead to the decay of capacity and inferior rate performance, limiting its application in energy storage system. [7,8] To address this issue, many efforts have been devoted to the structure design such as hybridization with carbon materials and nanoengineering (such as WS 2 nanoplates in nitrogen-doped CNFs, WS 2 nanowires, WS 2 @graphene composites), [6,9,10] which are effective to buffer interior stress resulted from volume expansion, reduce structural pulverization, shorten ions transfer path, and inhibit agglomeration of materials. Moreover, electrospinning is one of the most effective ways to fabricate flexible membrane structures combining active materials with carbonaceous materials without complicated preparation process and the addition of binder that is electrically insulated and obstructive to ion transportation. [11] For instance, Zhang has reported flexible NiS/CNF and WS 2 /GCNF hybrids via electrospinning as anodes for LIBs with enhanced lithium storage property. [5,12] However, the electrochemical performance of most WS 2 composites reported is still limited by the sluggish reaction kinetics and inferior long-term stability.Capacitive processes that are related to atoms on or near the surface possess faster reaction kinetics and more stable cyclability, when compared with diffusion-controlled storage processes (insertion, conversion, and alloying) in traditional Li-ion storage applications. [13,14] Thus far, in addition to some active materials such as MnO 2 , Nb 2 O 5 , and RuO 2 with intrinsic capacitive behavior, extrinsic capacitive behavior with fast kinetics is also favorable for insertion-(TiO 2 , LiCoO 2 , LiMn 2 O 4 , etc.), conversion-(MoO 2 , V 2 O 5 , etc.), and alloying-type active materials for LIBs via surface and nanostructure engineering to create more reaction sites. [13,15,16] Thus, the design of LIB anode materials with capacitive behavior to induce outstanding electrochemical properties is increasingly imperative. However, Flexible electrodes have recently elicited attention due to their potential to be woven into textiles as flexible power supplies for wearable electronic devices. However, contemporary flexible electrodes generally suffer from the limited reaction kinetics and inferior stability. Here, a flexible WS 2 @CNFs membrane electrode is facilely fabricated via hydrothermal method and subsequent electrospinning to embed WS 2 nanosheets into interconnected framework of carbon nanofibers (CNFs). Benefitting from 3D porous architecture and good conductivity of CNFs, WS 2 @CNFs composit...

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Section: Resultsmentioning

confidence: 99%

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

Zeng

Chen

et al. 2017

Adv Materials Inter

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“…[25][26][27] Amongt ungsten compounds, tungsten-based sulfides have been widely investigated as active HER catalysts. [31][32][33][34] Therefore, these tungsten compounds with excellent HER activity couldb e used as cocatalysts to improvep hotocatalytic hydrogen evolution. [31][32][33][34] Therefore, these tungsten compounds with excellent HER activity couldb e used as cocatalysts to improvep hotocatalytic hydrogen evolution.…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30] In contrast, less attention has been devoted to investigatingt he HER activity of tungsten-based carbides and nitrides.H owever,i nr ecent years, they have been reported as HER catalysts with high activity, and W-based carbides even displayed superior activity towards HER. [31][32][33][34] Therefore, these tungsten compounds with excellent HER activity couldb e used as cocatalysts to improvep hotocatalytic hydrogen evolution. At the same time, it is attractive to explore the effects of different tungsten compounds as cocatalysts on photocatalytic reaction and find the optimal cocatalyst for practical applications.…”

Section: Introductionmentioning

confidence: 99%

WX_y/g‐C₃N₄ (WX_y=W₂C, WS₂, or W₂N) Composites for Highly Efficient Photocatalytic Water Splitting

et al. 2019

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The development of earth‐abundant, economical, and efficient photocatalysts to boost water splitting is a key challenge for the practical large‐scale application of hydrogen energy. In this study, g‐C3N4 loaded with different tungsten compounds (W2C, WS2, and W2N) is found to exhibit enhanced photocatalytic activities. W2C/g‐C3N4 displays the highest activity for the photocatalytic reaction with a H2 evolution rate of up to 98 μmol h−1, as well as remarkable recycling stability. The excellent photocatalytic activity of W2C/g‐C4N3 is attributed to the suitable band alignment in W2C/g‐C4N3 and high HER activity of the W2C cocatalyst, which promotes the separation and transfer of carriers and hydrogen evolution at the surface. These findings demonstrate that the tungsten carbide cocatalyst is more active for the photocatalytic reaction than the sulfide or nitride, paving a way for the design of novel and efficient carbides as cocatalysts for photocatalysis.

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“…For example, as summarized by Chen et al, three factors help to fabricate more efficient and advantageous HER catalysts: 1) atomic‐sized layered TMDs and a large surface area help to increase the number of active sites for a given number of total atoms, 2) the specific surface area allows these materials to serve as ideal platforms to couple with other materials or substrates, and 3) their surface can be easily activated and optimized to obtain higher HER activity by regulating defects, strain and heteroatoms . According to the unique nature of TMDs, many studies follow two strategies to improve HER characteristics, such as thinning the layer thickness using CVD and exfoliation, aiming to make active edges, introducing defects into the basal surface using plasma, improving the electrical conductivity for fast charge transfer, boosting conductive materials, doping with heteroatoms, employing metallic candidates, and coupling with substrates …”

Section: Energy Devicesmentioning

confidence: 99%

2D Transition Metal Dichalcogenide Thin Films Obtained by Chemical Gas Phase Deposition Techniques

Park

Nielsch

Thomas

2018

Adv Materials Inter

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Ultrathin 2D transition metal dichalcogenide (TMD) thin films have attracted much attention due to their very good electrical, optical, and electrochemical properties. Chemical vapor deposition (CVD) and atomic layer deposition (ALD), which is in some regards an enhanced version of CVD, are techniques that can provide exceptionally conformal large‐area coatings, even for complex surface geometries. Besides, these techniques include the transport of one or more precursor chemicals in the gas phase onto a substrate. Subsequently, a chemical reaction occurs, resulting in the deposition of a film of a solid material on the substrate. One of the advantageous aspects of chemical deposition methods, such as CVD and ALD, is the growth of thin films onto a variety of substrates as well as 3D structures. Because of their chemical approach, these techniques are well suited to synthesizing 2D materials (2DMs) with a low defect concentration. Furthermore, the scalability would allow industrial application, as opposed to, e.g., micromechanical cleavage. Here, the recent progress in 2D TMD thin films is reviewed and the current applications of these materials fabricated by CVD and ALD are surveyed.

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Interface Engineered W_xC@WS₂ Nanostructure for Enhanced Hydrogen Evolution Catalysis

Cited by 140 publications

References 49 publications

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

WX_y/g‐C₃N₄ (WX_y=W₂C, WS₂, or W₂N) Composites for Highly Efficient Photocatalytic Water Splitting

2D Transition Metal Dichalcogenide Thin Films Obtained by Chemical Gas Phase Deposition Techniques

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Interface Engineered WxC@WS2 Nanostructure for Enhanced Hydrogen Evolution Catalysis

Cited by 140 publications

References 49 publications

Flexible WS2@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

Flexible WS2@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

WXy/g‐C3N4 (WXy=W2C, WS2, or W2N) Composites for Highly Efficient Photocatalytic Water Splitting

2D Transition Metal Dichalcogenide Thin Films Obtained by Chemical Gas Phase Deposition Techniques

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Interface Engineered W_xC@WS₂ Nanostructure for Enhanced Hydrogen Evolution Catalysis

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

Flexible WS₂@CNFs Membrane Electrode with Outstanding Lithium Storage Performance Derived from Capacitive Behavior

WX_y/g‐C₃N₄ (WX_y=W₂C, WS₂, or W₂N) Composites for Highly Efficient Photocatalytic Water Splitting