Boosting photocatalytic activity through tuning electron spin states and external magnetic fields

Peng, Chengxiao; Fan, Wen; Li, Qian; Han, Wenna; Chen, Xuefeng; Zhang, Guangbiao; Yan, Yuli; Gu, Qinfen; Wang, Chao; Zhang, Huarong; Zhang, Peiyu

doi:10.1016/j.jmst.2021.11.031

Cited by 32 publications

(11 citation statements)

References 59 publications

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“…Magnetic photocatalysts, in general, have attracted significant interest due to the effects of intrinsic and external magnetic fields on them and the enhancements that their manipulation can offer to photocatalytic water purification applications. It is known that external magnetic field application during photocatalytic reactions can enhance e − h + (electron/hole) charge-carrier separation via Lorentz forces in opposite directions and suppress recombination phenomena [27,[34][35][36]. Furthermore, the application of an external magnetic field can result in the exertion of Lorentz force to both the photocatalyst as well as the pollutant in opposite directions, achieving proximity and contaminant adsorption on the catalyst surface [37].…”

Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

“…Furthermore, the application of an external magnetic field can result in the exertion of Lorentz force to both the photocatalyst as well as the pollutant in opposite directions, achieving proximity and contaminant adsorption on the catalyst surface [37]. In the case of ferromagnetic photocatalysts, an external magnetic field also leads to electron spin alignment in the material's domains, frequently resulting in negative magnetoresistance, which facilitates charge transfer [36]. Overall, composites with ferromagnetic materials show increased pollutant degradation rates with the increase in the applied external magnetic field strength [38], and, in cases where the resulting alignment of magnetic moments is the same for different components of the composite, facile electron migration through the interface has been reported [39].…”

Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

“…Additionally, the manipulation of the photocatalysts' electron spin polarization states by methods such as doping has also been thought to suppress charge-carrier recombination. In such magnetic semiconductors, flipping the electrons' spin state can occur via spin-orbit or hyperfine coupling and the recombination between photoexcited e − and h + can be prohibited [36]. Most importantly, the presence of a magnetic material as part of a photocatalytic composite makes it easily recoverable after the end of the photocatalytic process by applying an external magnetic field.…”

Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

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Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

et al. 2022

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In this review, the most recent advances in the field of magnetic composite photocatalysts with integrated plasmonic silver (Ag) is presented, with an overview of their synthesis techniques, properties and photocatalytic pollutant removal applications. Magnetic attributes combined with plasmonic properties in these composites result in enhancements for light absorption, charge-pair generation-separation-transfer and photocatalytic efficiency with the additional advantage of their facile magnetic separation from water solutions after treatment, neutralizing the issue of silver’s inherent toxicity. A detailed overview of the currently utilized synthesis methods and techniques for the preparation of magnetic silver-integrated composites is presented. Furthermore, an extended critical review of the most recent pollutant removal applications of these composites via green photocatalysis technology is presented. From this survey, the potential of magnetic composites integrated with plasmonic metals is highlighted for light-induced water treatment and purification. Highlights: (1) Perspective of magnetic properties combined with plasmon metal attributes; (2) Overview of recent methods for magnetic silver-integrated composite synthesis; (3) Critical view of recent applications for photocatalytic pollutant removal.

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Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

Section: Magnetic Materials and Silver Enhancementmentioning

confidence: 99%

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Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

et al. 2022

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“…To our best knowledge, few 2D photocatalysts can spontaneously achieve overall water splitting, such as PdSeO 3 and B, N-codoped graphdiyne monolayers. , Fortunately, building van der Waals heterostructures with two staggered semiconductors may be a good strategy to address the above problems . The Z-scheme heterostructure is desirable compared to other types of heterostructures, which can effectively separate electron–hole pairs, extend the light-harvesting range, and maintain a strong redox potential …”

Section: Introductionmentioning

confidence: 99%

“…13 The Z-scheme heterostructure is desirable compared to other types of heterostructures, which can effectively separate electron−hole pairs, extend the lightharvesting range, and maintain a strong redox potential. 14 Recently, the SnS 2 nanosheet has been sought after by many researchers due to its unique properties and has also been synthesized experimentally by various methods. 15,16 It exhibits good energy storage properties, photosensitivity, and stability and is a promising material for Li-ion batteries and photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Exploration of Photocatalytic Overall Water Splitting Mechanisms in the Z-Scheme SnS₂/β-As Heterostructure

et al. 2023

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The Z-scheme heterostructure photocatalysts have irreplaceable advantages over other heterostructures due to their ability to separate the spatial carriers and retain strong redox ability. In this study, we explored the SnS2/β-As (β-arsenene) van der Waals heterostructure with Z-scheme properties and suitable band edge positions as a potential photocatalyst for overall water splitting. Under appropriate conditions, the hydrogen evolution reaction (HER) barrier is much closer to 0. Based on the oxidation product criteria, the SnS2/β-As heterostructure photocatalyst may generate multiple end products, including •OH, H2O2, and O2. Moreover, we screen the optimal and most possible reaction pathway OER-III under irradiation among three underlying oxygen evolution reaction (OER) mechanisms, in which the intermediate species HOOH* acts as a bridge for subsequent reactions. The solar-to-hydrogen conversion efficiency of the heterostructure can reach 17.18%. This work provides new insights into designing superior photocatalysts for overall water splitting and recognizing the OER mechanism.

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Research Advances in Magnetic Field‐Assisted Photocatalysis

Li,

Qiu,

Cao

et al. 2024

Adv Funct Materials

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Solar‐to‐chemical energy conversion thorugh photocatalytic technology has garnered significant attention due to its potential for clean hydrogen pro duction, pollutant degradation, and carbon dioxide reduction. However, its relatively low solar‐to‐chemical conversion efficiency hinders its industrial development. External fields have currently emerged as a supplementary energy source to augment the overall catalytic efficiency. Recently, the photocatalytic performance has been considerably enhanced through magnetic field modulation, which promotes the separation and transfer of photoexcited charge carriers. This article systematically reviews the recent research progress of magnetic field–assisted photocatalysis, discussing phenomena such as the negative magnetoresistance effect, Lorentz force, and spin polarization. It comprehensively analyzes the effect of magnetic fields on critical processes in photocatalysis: light absorption, charge‐carrier separation, and surface reactions. In particular, this review focuses on the spin‐relaxation mechanism, explains how the electron lifetime is extended through spin polarization, and proposes design strategies for spin‐polarized materials. Finally, this review discusses the challenges and potential opportunities for enhancing photocatalytic efficiency. The ultimate objective of this review is to offer notable theoretical and experimental insights that can guide the design and development of high‐performance photocatalysts and photocatalytic systems.

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Boosting photocatalytic activity through tuning electron spin states and external magnetic fields

Cited by 32 publications

References 59 publications

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Exploration of Photocatalytic Overall Water Splitting Mechanisms in the Z-Scheme SnS₂/β-As Heterostructure

Research Advances in Magnetic Field‐Assisted Photocatalysis

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Boosting photocatalytic activity through tuning electron spin states and external magnetic fields

Cited by 32 publications

References 59 publications

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Exploration of Photocatalytic Overall Water Splitting Mechanisms in the Z-Scheme SnS2/β-As Heterostructure

Research Advances in Magnetic Field‐Assisted Photocatalysis

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Product

Resources

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Exploration of Photocatalytic Overall Water Splitting Mechanisms in the Z-Scheme SnS₂/β-As Heterostructure