Identification of the Charge Transfer Channel in Cobalt Encapsulated Hollow Nitrogen‐Doped Carbon Matrix@CdS Heterostructure for Photocatalytic Hydrogen Evolution

Li, Xuli; Song, Shaojia; Gao, Yangqin; Ge, Lei; Song, Weiyu; Ma, Tianyi; Liu, Jian

doi:10.1002/smll.202101315

Cited by 56 publications

(30 citation statements)

References 49 publications

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“…A smaller φ value for the NC (002) slab means its electron would more easily transfer from the bulk to surface compared to the Ru (101) slab. 55 Therefore, the electrons would more likely transfer from NC to Ru at the interface, which was consistent with our XPS efforts. Such interfacial electrons would benefit the formation of the Schottky junction in composite Ru NPs/NC catalysts.…”

Section: Electrocatalytic Activity and In Situ X-ray Absorption Spect...supporting

confidence: 87%

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

et al. 2022

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Ruthenium-based materials are considered great promising candidates to replace Pt-based catalysts for hydrogen production in alkaline conditions. Herein, we adopt a facile method to rationally design a neoteric Schottky catalyst in which uniform ultrafine ruthenium nanoparticles featuring lattice compressive stress are supported on nitrogen-modified carbon nanosheets (Ru NPs/NC) for efficient hydrogen evolution reaction (HER). Lattice strain and Schottky junction dual regulation ensures that the Ru NPs/NC catalyst with an appropriate nitrogen content displays superb H 2 evolution in alkaline media. Particularly, Ru NPs/NC-900 with 1.3% lattice compressive strain displays attractive activity and durability for the HER with a low overpotential of 19 mV at 10 mA cm −2 in 1.0 M KOH electrolyte. The in situ X-ray absorption fine structure measurements indicate that the low-valence Ru nanoparticle with shrinking Ru−Ru bond acts as catalytic active site during the HER process. Furthermore, multiple spectroscopy analysis and density functional theory calculations demonstrate that the lattice strain and Schottky junction dual regulation tunes the electron density and hydrogen adsorption of the active center, thus enhancing the HER activity. This strategy provides a novel concept for the design of advanced electrocatalysts for H 2 production.

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Section: Electrocatalytic Activity and In Situ X-ray Absorption Spect...supporting

confidence: 87%

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

et al. 2022

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“…The E CB of n‐type semiconductors is 0.1 V lower than E f . [ 37 ] So the E CB of BS and BSN‐2 were −0.39 and −0.41 V versus NHE, respectively. According to Equation , the calculated valence band potentials ( E VB ) of BS and BSN‐2 are 1.09 and 1.03 V versus NHE, respectively.…”

Section: Resultsmentioning

confidence: 99%

Engineering of Band Structure of Bismuth Selenide Ultrathin Nanosheets as Multifunctional Material for Photocatalytic Application

Wang

Shuai

Zhang

et al. 2022

Adv Materials Inter

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The rapid development of industry and technology has caused serious environmental pollution. The wastewater is one of the main pollution sources, so the degradation of pollutants from dye wastewater and pharmaceutical wastewater has always been concerned. [1,2] For example, residual antibiotics are discharged into the water system and they will cause irreversible damage eventually to human health. [3,4] Ciprofloxacin (CIP) as one of Fluoroquinolones is a commonly used antibiotic and it becomes the main component of pharmaceutical wastewater. [5] However, the residue CIP may be discharged into the recycled water system and cause the drug resistance of bacteria, biotoxicity to probiotics, and damage to the human immune system. [6,7] Therefore, it is significant to treat the wastewater containing CIP by simple and high-efficient technique for the protection of life and health. At present, photocatalytic degradation is an efficient and ecofriendly technique that can utilize solar energy to remove pollutants, [8,9] compared with Fenton oxidation, [10] sonochemistry method, and ozonation process. [11] However, some photocatalysis materials cannot meet demand of actual applications because of low activity. A wellknown photocatalyst-TiO 2 has superior activity and stability, but the photo response is only in the ultraviolet region because of the wide band gap that restricts its practical application. [12] CdS and g-C 3 N 4 have narrow band gap and strong visible light absorption ability, [13,14] but the weak redox capacity and high recombination rate of photogenerated carriers make them have inferior properties. Comparatively, Bi-based materials such as BiOX (X = Cl, Br, I) exhibit excellent activity in photocatalytic applications. Bi 3 NbO 7 /BiOCl material has a strong visible light response and low recombination of photogenerated carriers, and it exhibited 93% of CIP degradation rate within 40 min illumination. [15] The flower-like BiOBr/Bi 2 S 3 showed superior performance under an indoor fluorescent lamp, and the CIP degradation rate could reach ≈ 97% after 60 min of irradiation. [16] The Bi 2 SiO 5 /Bi 4 MoO 9 material exhibited high degradation activity and the CIP degradation rate reached 95.7% under UV light. [17] For comparison with the above composites, bismuth selenide is N-substituted bismuth selenide (BSN) material is synthesized by a one-step solvothermal route and used for the photocatalytic application. As-prepared BSN consists of ultrathin nanosheets and has a quasi hexagonal morphology. The results show the superior performance of BSN-2 for degradation of multi-pollutants and the ciprofloxacin and phenol removal rates reach 88.8 and 83.6%, respectively, under irradiation of simulated solar for 2 h, which is much higher than those over pristine bismuth selenide. The significant improvement of photocatalytic performance is attributed to ultrathin nanosheets structure and N introduction that contribute to the inhibition of photoelectron-hole pair recombination and the enhancement of light absorption. The ...

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“…Varieties of approaches are devoted to overcoming these shortcomings, including doping, formation of heterojunctions, regulation of morphology, loading of cocatalysts, and so on. In particular, morphology regulation of CdS (porous nanosheets, hollow spheres, nanotubes, and quantum dots) can provide strong interfacial contact with other semiconductors, expose rich active sites, and enhance the charge separation at the axial or radial direction . Yu’s research group constructed CdS hollow spheres (HSs) that integrate with N-doped graphene to boost the photocatalytic performance .…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Zeolitic Imidazolate Framework/CdS Hollow Microspheres with Efficient Charge Separation for Enhanced Photocatalytic Hydrogen Evolution

Zhang

Liu

et al. 2022

Inorg. Chem.

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Enhanced interfacial charge separation is of great importance to high-efficiency photocatalytic hydrogen production. Herein, we successfully fabricated novel ZIF-67/CdS hollow sphere (HS) and ZIF-8/CdS HS heterostructures through an in situ self-assembly process, in which ZIF-67 and ZIF-8 are closely coated on CdS HSs to form “double-shell”-like structures. This hierarchical heterostructure with porous outer layers on the surface of CdS HSs can expose accessible active sites and possess close contact. Upon visible-light illumination, the optimal proportion of ZIF-67/CdS HS displays a hydrogen generation rate of 1721 μmol g–1 h–1, which is 11.9 and 3.1 times higher than that of a pure CdS HS (145 μmol g–1 h–1) and ZIF-8/CdS HS (555 μmol g–1 h–1), respectively. The proposed photocatalytic mechanism is explored: ZIF-8/CdS HS follows the type-II mechanism, and ZIF-67/CdS HS follows the Z-scheme mechanism. The reason for the higher photocatalytic activity of ZIF-67/CdS HS is that ZIF-67 not merely with a porous structure facilitates the diffusion of H2 gas, but with a well-matched band structure promotes charge transfer and separation.

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Identification of the Charge Transfer Channel in Cobalt Encapsulated Hollow Nitrogen‐Doped Carbon Matrix@CdS Heterostructure for Photocatalytic Hydrogen Evolution

Cited by 56 publications

References 49 publications

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

Engineering of Band Structure of Bismuth Selenide Ultrathin Nanosheets as Multifunctional Material for Photocatalytic Application

Self-Assembled Zeolitic Imidazolate Framework/CdS Hollow Microspheres with Efficient Charge Separation for Enhanced Photocatalytic Hydrogen Evolution

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Identification of the Charge Transfer Channel in Cobalt Encapsulated Hollow Nitrogen‐Doped Carbon Matrix@CdS Heterostructure for Photocatalytic Hydrogen Evolution

Cited by 56 publications

References 49 publications

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H2 Production

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H2 Production

Engineering of Band Structure of Bismuth Selenide Ultrathin Nanosheets as Multifunctional Material for Photocatalytic Application

Self-Assembled Zeolitic Imidazolate Framework/CdS Hollow Microspheres with Efficient Charge Separation for Enhanced Photocatalytic Hydrogen Evolution

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Product

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Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production