Nitrogen-doped carbon active sites boost the ultra-stable hydrogen evolution reaction on defect-rich MoS2 nanosheets

Cai, Weiwei; Luo, Xingying; Jiang, Yao; Liu, Zhao; Li, Jing; Ma, Liang; Xiong, Jie; Yang, Zehui; Cheng, Hansong

doi:10.1016/j.ijhydene.2017.12.059

Cited by 36 publications

(5 citation statements)

References 88 publications

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“…However, the technique is rarely used to create defects on the MoS 2 basal plane. The doped defects produced by the incorporation of Zn, Pd, N, P, and O‐incorporation has also been reported. For instance, Liu et al.…”

Section: Preparetion Of Defect‐rich Mos2 For Enhancing Her Performancementioning

confidence: 92%

“…For example, Cheng's group used a small amount of N-doped carbon active sites as additional H atom adsorption sites, which were doped into defect-rich MoS 2 nanosheets catalyst (CN@MoS 2 /C). [58] In addition to anion doping, cationic doping can also achieve defective MoS 2 catalysts. [60,61] Xu's group synthesized Zn-doped MoS 2 with S-vacancies (Zn@MoS 2 ) at high-temperature and allowed V S % to be tuned from 7.8% to 20.3% by the zinc dosage.…”

Section: Heteroatom Dopingmentioning

confidence: 99%

“…Heteroatom‐ doping in the carbon support can improve conductivity of MoS 2 , and thus improve the electron transport efficiency of the catalyst. For example, Cheng's group used a small amount of N‐doped carbon active sites as additional H atom adsorption sites, which were doped into defect‐rich MoS 2 nanosheets catalyst (CN@MoS 2 /C) …”

Section: Preparetion Of Defect‐rich Mos2 For Enhancing Her Performancementioning

confidence: 99%

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Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Cheng

Song

et al. 2020

Chemistry An Asian Journal

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MoS 2 have recently emerged as alternatives to noble metals as electrocatalysts for the hydrogen evolution reaction (HER) owing to their abundance and low cost. Considering the shortcomings of MoS 2 , including insufficient active sites, inert basal plane, and poor conductivity, the electrocatalytic hydrogen evolution properties of MoS 2 can be improved in three ways: activating the inert basal plane to improve intrinsic activity, increasing active edge sites, and improving the conductivity. Defects can adjust the surface electronic structure of the crystal to bring the hydrogen adsorption free energy closer to zero. Therefore, current research has mainly used S-vacancies to activate the inert basal surface of MoS 2 ; used edge defects to increase the number of active sites; and used defective conductive carbon supports to improve the conductivity of MoS 2-based catalysts. This review introduces researches on improving the performance of MoS 2 for HER by considering the purpose, characterization, and preparation of defects.

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Section: Preparetion Of Defect‐rich Mos2 For Enhancing Her Performancementioning

confidence: 92%

Section: Heteroatom Dopingmentioning

confidence: 99%

Section: Preparetion Of Defect‐rich Mos2 For Enhancing Her Performancementioning

confidence: 99%

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Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Cheng

Song

et al. 2020

Chemistry An Asian Journal

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“…Hence, Raman analysis offers valuable insights into the quantities and types of local defects present in the samples. The presence of these defects primarily promotes the formation of electrochemically active centers, 32 leading to a substantial enhancement in the HER activity.…”

Section: Resultsmentioning

confidence: 99%

Nickel-Embedded Carbon Nanostructures as Noble Metal-Free Catalysts for the Hydrogen Evolution Reaction

Kumar,

Goyal

et al. 2024

ACS Appl. Nano Mater.

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We demonstrate the electrocatalytic activity of "nitrogen (N)-doped porous carbon matrix embedded with nickel nanoparticles" for efficient hydrogen evolution reaction (HER) in alkaline medium. Three samples were synthesized via pyrolysis of a fixed amount (500 mg) of Ni(acac) 2 , along with three different amounts of nitrogen precursor melamine (100, 250, and 500 mg) separately. The varying nitrogen concentrations of the surrounding carbon layers on the Ni nanoparticles enhance the surface area and porosity, exposing extensive active sites for catalytic reactions. The transition metal-based catalysts are crucial for long-term sustainability due to their combined edge (effectiveness and inexpensiveness) over traditional catalysts. Thus, by employing the protective carbon layer on the transition metal nanoparticles, we fabricated a catalyst that exhibits outstanding performance, with a low overpotential of 45.6 mV at 10 mA cm −2 in 1 M KOH and maintains it for 24 h (durability), highlighting its exceptional catalytic efficacy and stability. The pores in carbon nanostructures facilitate the ionic moieties to move to active sites inside the pores. As the pore size variation influences the movement of charge or diffusion, this is reflected in the magnitude of impedance (|Z| imp ). Consequently, the enhanced number of active sites along with the larger pore sizes resulting from optimum amounts of nitrogen doping enables the sample with minimal |Z| imp and an enhanced HER performance. The present study demonstrates the way to design a sustainable, extremely effective, and inexpensive HER electrocatalyst.

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“…Hydrogen, as a scalable and sustainable energy source with its clean conversion chains from production to utilization, is one of the most promising candidates for traditional fossil fuels. − Hydrogen evolution reaction (HER) offers a promising and sustainable approach to produce hydrogen. − For an efficient HER process, an advanced electrocatalyst is of great importance. , Platinum-group metals are the most effective electrocatalyst for HER, but their wide application is hindered by their scarcity and high cost. To allow a prosperous development of HER, finding electrode materials that are not only efficient but also earth-abundant to replace Pt-group catalysts is more urgent than ever before. ,− …”

Section: Introductionmentioning

confidence: 99%

Novel WS₂-Based 3D Electrode with Protecting Scaffold for Efficient and Stable Hydrogen Evolution

Yang

Sun

2019

J. Phys. Chem. C

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The synthesis of an efficient and stable WS2-based three-dimensional (3D) electrode remains a challenge. Herein, a novel WS2-based 3D electrode (WS2/graphite rods (GR)) with significantly advanced electrocatalytic hydrogen evolution activity and stability was demonstrated. Compared to the film electrode of powdery WS2, WS2/GR showed a much lowered contact resistance (∼1 Ω), leading to a 200 mV lowered overpotential and a Tafel slope (47.9 mV·dec–1) much closer to that of the Pt electrode. Meanwhile, the novel 3D electrode exhibited greatly improved stability with little current decay after 15 h reaction. Further investigation revealed three different morphologies of WS2 nanostructures on and into the graphite rod. While the vertically growing WS2 nanosheets and WS2 nanoparticles inside played essential roles in advanced activity, the densely stacked ball-like self-assemblies of WS2 nanosheets on the surface of the rod was of little importance for the hydrogen evolution reaction performance. The reasons were that the confinement effect and the well protection of the graphite scaffold allowed the WS2 nanostructures inside the rod with largely exposed active sites and less likely to be oxidized. The work not only achieved excellent WS2-based 3D electrode but also provided effective approach for synthesizing efficient and stable 3D electrodes.

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Nitrogen-doped carbon active sites boost the ultra-stable hydrogen evolution reaction on defect-rich MoS2 nanosheets

Cited by 36 publications

References 88 publications

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Nickel-Embedded Carbon Nanostructures as Noble Metal-Free Catalysts for the Hydrogen Evolution Reaction

Novel WS₂-Based 3D Electrode with Protecting Scaffold for Efficient and Stable Hydrogen Evolution

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Nitrogen-doped carbon active sites boost the ultra-stable hydrogen evolution reaction on defect-rich MoS2 nanosheets

Cited by 36 publications

References 88 publications

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS2‐based Materials

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS2‐based Materials

Nickel-Embedded Carbon Nanostructures as Noble Metal-Free Catalysts for the Hydrogen Evolution Reaction

Novel WS2-Based 3D Electrode with Protecting Scaffold for Efficient and Stable Hydrogen Evolution

Contact Info

Product

Resources

About

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Novel WS₂-Based 3D Electrode with Protecting Scaffold for Efficient and Stable Hydrogen Evolution