Tuning the hydrogen evolution performance of 2D tungsten disulfide by interfacial engineering

Shi, Meiqin; Jiang, Zhuangzhuang; Mei, Bingbao; Li, Yingying; Sun, Fanfei; Yu, Haisheng; Xu, Yaohua

doi:10.1039/d0ta10673a

Cited by 14 publications

(10 citation statements)

References 67 publications

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“…This further indicates that Ni replaces doped W 2 N in the form of Ni 2+ in the target material, which is consistent with XAS fitting analysis results. According to the W 4f spectrum (Figure S6c), the high peaks with binding energies of 35.65 and 37.8 eV correspond to W 6+ . − Combined with the N 1s spectrum (Figure S6d), it can be seen that the catalyst is W 2 N. , In addition, there is pyridinic-N in the spectra of N 1s, which is mainly caused by doping. That further proves the structure of Ni doped W 2 N. It is worth noting that Table S2 presents clearly that as the concentration of ammonium metatungstate increases, the content of Ni in the catalyst decreases gradually.…”

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confidence: 98%

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Dan

Liang

Gong

et al. 2022

ACS Materials Lett.

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Transition metal nitrides and elemental doping are effective methods to enhance the catalytic activity of hydrogen evolution reaction (HER) at a high current density. Herein, Ni-W2N@NF was synthesized to exhibit excellent HER performance in an alkaline environment. Not only theoretical but also experimental analyses prove that Ni enters the W2N lattice in the form of substitutional doping. Ni-doped W2N optimizes the free energy of hydrogen adsorption and hydroxide adsorption. Thus, the HER kinetics are accelerated. Therefore, the synthesized Ni-W2N@NF achieved an industrial high current density of 2000 mA cm–2 in 1 M KOH with a small overpotential of 317 mV. The HER activity of Ni-W2N@NF is superior to those of most reports. What is more, the obtained catalyst achieves a current density of 1500 mA cm–2 in an alkaline seawater solution with an overpotential of only 345 mV and exhibits excellent cycling stability. This work will offer a feasible idea for a designing platinum group metals free metal as an effective catalyst for HER reaction under an industrial large current in an alkaline solution.

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confidence: 98%

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Dan

Liang

Gong

et al. 2022

ACS Materials Lett.

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“…The synergistic effect of WS 2 and WO 3 on the HER performance of their composite material has been investigated in detail [ 28 , 29 ]. At the edge of the art, a new approach to improve the electrocatalytic performance of WS 2 is to combine it with a transition metal carbide (TMC) material, such as WC or MoC [ 30 , 31 ]. Transition metal carbides (TMCs) show high metallic conductivity and ceramic properties, including chemical durability, high hardness, and high melting point.…”

Section: Introductionmentioning

confidence: 99%

WS2–WC–WO3 nano-hollow spheres as an efficient and durable catalyst for hydrogen evolution reaction

et al. 2021

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Transition metal dichalcogenides (TMDs), transition metal carbides (TMCs), and transition metal oxides (TMOs) have been widely investigated for electrocatalytic applications owing to their abundant active sites, high stability, good conductivity, and various other fascinating properties. Therefore, the synthesis of composites of TMDs, TMCs, and TMOs is a new avenue for the preparation of efficient electrocatalysts. Herein, we propose a novel low-cost and facile method to prepare TMD–TMC–TMO nano-hollow spheres (WS2–WC–WO3 NH) as an efficient catalyst for the hydrogen evolution reaction (HER). The crystallinity, morphology, chemical bonding, and composition of the composite material were comprehensively investigated using X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The results confirmed the successful synthesis of the WS2–WC–WO3 NH spheres. Interestingly, the presence of nitrogen significantly enhanced the electrical conductivity of the hybrid material, facilitating electron transfer during the catalytic process. As a result, the WS2–WC–WO3 NH hybrid exhibited better HER performance than the pure WS2 nanoflowers, which can be attributed to the synergistic effect of the W–S, W–C, and W–O bonding in the composite. Remarkably, the Tafel slope of the WS2–WC–WO3 NH spheres was 59 mV dec−1, which is significantly lower than that of the pure WS2 NFs (82 mV dec−1). The results also confirmed the unprecedented stability and superior electrocatalytic performance of the WS2–WC–WO3 NH spheres toward the HER, which opens new avenues for the preparation of low-cost and highly effective materials for energy conversion and storage applications.

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“…As such, the distribution of the various N-doping types in the graphene backbone of the WNGAs is presented in Figure . In the high-resolution W 4f spectra (Figure ), the W 4f 7/2 (35.4–35.7 eV) and W 4f 5/2 (37.6–37.8 eV) peaks are characteristics of the W–S bond, while the W 5p 3/2 (41.3–41.7 eV) peak is representative of the W–O species. , Last but not least, two distinct bonding states of S can be distinguished from the S 2p region (Figure ): S–W (161.5–161.8 and 163.2–163.6 eV for S 2p 3/2 and S 2p 1/2 , respectively) and S–O (169–169.2 and 170.3–170.7 eV for S 2p 3/2 and S 2p 1/2 , respectively) Table S4 summarizes the XPS peak-fitting results of the WNGAs.…”

Section: Resultsmentioning

confidence: 99%

Aerogels Made of Few-Layer WS₂ Nanosheets and Nitrogen-Doped Graphene for Photocatalytic Degradation of Caffeine

Shafi,

Das,

Dubey

et al. 2024

ACS Appl. Nano Mater.

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As a spontaneous renewable energy-based technology, with an astonishing ability to destroy recalcitrant organic pollutants under ambient conditions, solar-driven heterogeneous photocatalysis has sparked immense interest over the past decade. However, creating photocatalysts with astounding visible-light harnessing capacity and undemanding recuperation persists as a significant hurdle to the widespread exploitation of photocatalysis in water treatment. Herein, we propose a potentially nontoxic, robust, durable, and self-supporting photocatalyst, based on the in situ growth of few-layer (FL) WS 2 nanosheets on the interpenetrating channels of nitrogen (N)-doped graphene aerogel (henceforth denoted as "WNGA"). Constructed through a mild hydrothermal processing scheme, WNGA shows self-floating capability, exceptional mechanical resilience, and remarkable solar absorption in the visible range. In addition, the coexistence of pyridinic N species and FL-WS 2 clusters synergistically provides surplus active sites for catalytic reactions. Besides, the interconnected conductive networks of WNGA coherently upregulate charge separation and transfer in 3D. As a result of these beneficial attributes, WNGA presents prominent photocatalytic activity and excellent recycling stability. For instance, through a combination of adsorption and partial oxidation, WNGA can dissociate up to 93% caffeine, the most widely consumed psychoactive substance, into innocuous products over multiple cycles. As a figure-of-merit for the commercial potential of WNGA, we also demonstrate the photocatalytic degradation of caffeine in four different real matrixes, viz., tap water, pond water, municipal wastewater, and hospital wastewater. The exceptional photocatalytic properties, improved durability, and facile retrieval opportunities validate the application potential of WNGA to eliminate psychoactive substances in aqueous environments.

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Tuning the hydrogen evolution performance of 2D tungsten disulfide by interfacial engineering

Abstract: WC|WS2 composites with a sponge-like structure were constructed by nanolayers with the aid of NaCl as a template. Each nanolayer was composed of WC|WS2 interfaces by inducing carbon as the...

Cited by 14 publications

References 67 publications

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

WS2–WC–WO3 nano-hollow spheres as an efficient and durable catalyst for hydrogen evolution reaction

Aerogels Made of Few-Layer WS₂ Nanosheets and Nitrogen-Doped Graphene for Photocatalytic Degradation of Caffeine

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Tuning the hydrogen evolution performance of 2D tungsten disulfide by interfacial engineering

Abstract: WC|WS2 composites with a sponge-like structure were constructed by nanolayers with the aid of NaCl as a template. Each nanolayer was composed of WC|WS2 interfaces by inducing carbon as the...

Cited by 14 publications

References 67 publications

Substitutional Doping Engineering toward W2N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W2N Nanorod for Hydrogen Evolution Reaction at High Current Density

WS2–WC–WO3 nano-hollow spheres as an efficient and durable catalyst for hydrogen evolution reaction

Aerogels Made of Few-Layer WS2 Nanosheets and Nitrogen-Doped Graphene for Photocatalytic Degradation of Caffeine

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Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Aerogels Made of Few-Layer WS₂ Nanosheets and Nitrogen-Doped Graphene for Photocatalytic Degradation of Caffeine