Enhanced photocatalytic water splitting over nickel-doped CdS nanocomposites synthesized via one-step controllable irradiation routine at ambient conditions

Wang, Fengqing; Hu, Changjiang; Chen, Chong; Cao, Shuiyan; Li, Qiuhao; Wang, Yunlong; Ma, Jun

doi:10.1016/j.apsusc.2022.156190

Cited by 8 publications

(3 citation statements)

References 61 publications

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“…As shown in Figure 4a, the binding energy of CdS at 412.28 and 405.50 eV are assigned to the Cd 3d 3/2 and Cd 3d 5/2 , while the Cd 3d peaks in Ni-CdS sample shift to the lower binding energy compared with those of CdS, which is attributed to the increase in electron cloud density due to the entry of Ni into the CdS unit cell, thus resulting in electron enrichment. [21] It is worth noting that the binding energy of S 2p spectra (Figure 4b) for Ni-CdS is shifted toward the lower region compared with that of CdS. This demonstrates that Ni doping induces S-vacancies and leads to a decrease in the coordination number of S atoms, which facilitates the formation of electron-rich S sites in Ni-CdS.…”

Section: Mechanism On the Enhanced Performancementioning

confidence: 84%

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Wu,

Zhang,

Wang

et al. 2024

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It is a challenge to regulate charge separation dynamics and redox reaction kinetics at the atomic level to synergistically boost photocatalytic hydrogen (H2) evolution. Herein, a robust Ni‐doped CdS (Ni‐CdS) photocatalyst is synthesized by incorporating highly dispersed Ni atoms into the CdS lattice in substitution for Cd atoms. Combined characterizations with theoretical analysis indicate that local lattice distortion and S‐vacancy of Ni‐CdS induced by Ni incorporation lead to an increased dipole moment and enhanced spin‐polarized electric field, which promotes the separation and transfer of photoinduced carriers. In this contribution, charge redistribution caused by enhanced internal electric field results in the downshift of the S p‐band center, which is conducive to the desorption of intermediate H* for boosting the H2 evolution reaction. Accordingly, the Ni‐CdS photocatalyst shows a remarkably improved photocatalytic performance with an H2 evolution rate of 20.28 mmol g−1 h−1 under visible‐light irradiation, which is 5.58 times higher than that of pristine CdS. This work supplied an insightful understanding that the enhanced polarization electric field governs the p‐band center for efficient photocatalytic H2 evolution activity.

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Section: Mechanism On the Enhanced Performancementioning

confidence: 84%

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Wu,

Zhang,

Wang

et al. 2024

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“…The difference is attributed to the extended penetration depth of typical γ-rays, which allows diffusive radical generation over a large volume of water and, thus, the uniform distribution of Ru NPs deposited on nanowire support. [13][14]18] TEM images of Ru@MnO 2-x and Ru@MnO 2 show a uniform nanowire morphology with diameters between 30-50 nm and lengths on the micrometer scale (Figure 1b; Figure S8). The bright field HRTEM images showed the dspacing values of the Ru nanoparticle and MnO 2 crystalline planes.…”

Section: Resultsmentioning

confidence: 99%

Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H₂ Evolution at Industrial‐Level Current Density

Yu,

Hu,

Chen

et al. 2023

Angewandte Chemie

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Developing novel synthesis technologies is crucial to expanding bifunctional electrocatalysts for energy‐saving hydrogen production. Herein, we report an ambient and controllable γ‐ray radiation reduction to synthesize a series of noble metal nanoparticles anchored on defect‐rich manganese oxides (M@MnO2‐x, M=Ru, Pt, Pd, Ir) for glycerol‐assisted H2 evolution. Benefiting from the strong penetrability of γ‐rays, nanoparticles and defect supports are formed simultaneously and bridged by metal‐oxygen bonds, guaranteeing structural stability and active site exposure. The special Ru−O−Mn bonds activate the Ru and Mn sites in Ru@MnO2‐x through strong interfacial coordination, driving glycerol electrolysis at low overpotential. Furthermore, only a low cell voltage of 1.68 V is required to achieve 0.5 A cm−2 in a continuous‐flow electrolyzer system along with excellent stability. In situ spectroscopic analysis reveals that the strong interfacial coordination in Ru@MnO2‐x balances the competitive adsorption of glycerol and OH* on the catalyst surface. Theoretical calculations further demonstrate that the defect‐rich MnO2 support promotes the dissociation of H2O, while the defect‐regulated Ru sites promote deprotonation and hydrogen desorption, synergistically enhancing glycerol‐assisted hydrogen production.

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“…Being a photoactive phenothiazine dye, the MB interacts with Ni-CdS photocatalysts under light irradiation, the whole molecule possibly degrades through synergetic competitive approaches, such as demethylation of MB dye followed by decomposition of the aromatic rings in the dye molecule as presented in scheme 2. The inset of scheme 2 shows the color change of the methylene blue and scheme 3 depicts the mechanism of photocatalytic methylene blue degradation [36][37][38]. The obtained values of k are equal to 0.0039, 0.0062, 0.0088, 0.0069, and 0.0062 min −1 for CdS, Ni05CdS, Ni1CdS, Ni2CdS and Ni5CdS, respectively as depicted in table 10.…”

Section: Photocatalytic Methylene Blue Degradation (Mb) Activitymentioning

confidence: 89%

Growth of Ni loaded CdS in nanorods structure for photocatalytic and dye degradation applications under solar irradiation

Kumar,

Raj,

Kommu

et al. 2024

Nano Ex.

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Due to the exponential increase in global energy consumption and the degradation of environmental conditions caused by fossil fuels, it is critical to improve inexhaustible and sustainable resources.Generally solar energy is one of the clean and environment agreeable energy sources. By harvesting solar energy for photocatalysis and considering it as a promising solution for various energy generation applications such as hydrogen production. Herein we are using Cadmium Sulphide and Nickel-doped Cadmium Sulphide in 0.5, 1 and 5 weight percent which act as photocatalyst for water splitting which will eventually produce an enormousamount of Hydrogen (H2). Cadmium sulphidewas prepared through the chemical precipitation method and Ni-CdS by hydrothermal technique. The purity and phase formation was examined by the X-Ray Diffraction (XRD) and validated via Rietveld refinement by using Full Prof software. The surface morphology and the structure of as-synthesized material were evaluated by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscope (TEM) spectroscopic techniques. In accordance with results the Ni-CdS nanocomposite having 1.0 wt% of Ni exhibits the highest H2 evolution rate of 9 mmolg-1 in 5 hrs with strong photo-stability, which is about 50 times higher than that of CdS. The material was tested to degrade organic dye for its photocatalytic operations. The newly prepared composite materials (CdS-Ni-NiO) were used for the photocatalytic degradation of the methylene blue (MB) dye. Ni(1.0 wt%)-CdSshows an optimaldegradation percentage of 95.436 in the presence of artificial solar light in 90 minutes. Crystal growth mechanism shows the spherical structure of CdS agglomerate to form nanorods structure when doped with Ni metal which also verified by the TEM images of CdS and Ni doped CdS. The results pave the way for designing multi-component CdS-Ni nano-composites for highly efficient H2 evolution and other environmental applications.

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Enhanced photocatalytic water splitting over nickel-doped CdS nanocomposites synthesized via one-step controllable irradiation routine at ambient conditions

Cited by 8 publications

References 61 publications

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H₂ Evolution at Industrial‐Level Current Density

Growth of Ni loaded CdS in nanorods structure for photocatalytic and dye degradation applications under solar irradiation

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Enhanced photocatalytic water splitting over nickel-doped CdS nanocomposites synthesized via one-step controllable irradiation routine at ambient conditions

Cited by 8 publications

References 61 publications

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H2 Evolution at Industrial‐Level Current Density

Growth of Ni loaded CdS in nanorods structure for photocatalytic and dye degradation applications under solar irradiation

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Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H₂ Evolution at Industrial‐Level Current Density