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Главная страница Новости науки Journal of Photochemistry and Photobiology C: Photochemistry Reviews
Новости науки
ScienceDirect Publication: Journal of Photochemistry and Photobiology C: Photochemistry Reviews
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  • Tailored indium sulfide-based materials for solar-energy conversion and utilization

    Publication date: March 2019

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 38

    Author(s): Jingjing Zhang, Hou Wang, Xingzhong Yuan, Guangming Zeng, Wenguang Tu, Sibo Wang

    Abstract

    To relieve the growing pressure originated from the energy shortage and environmental issues, solar-energy conversion into chemical or electrical energy has undergone an unprecedented development as a promising strategy in recent years. Indium sulfide (In2S3), an efficient visible-light harvester, has been extensively investigated in the field of photoconversion, owing to the fascinating merits including superior photo-absorption coefficient, photoelectric sensitivity, favorable carrier mobility, moderate band gap, excellent stability, and low toxicity. To take full advantage of these properties and further expand beyond the existing short board like low quantum efficiency, various In2S3-based functional nanostructures like nanoparticles, nanotubes, atomic two-dimensional sheets, and nanosheets-assembled complexes have been developed. Meanwhile, pleasurable characters of In2S3 have been modulated via defective engineering, doping, and hybridization (with inorganic materials or bio-molecules). Gratifyingly, In2S3-based photocatalytic, photoelectrocatalytic and photovoltaic systems have made significant impact on the field of energy and environmental issues. Therefore, this review provides an overview of crystal and morphologic structures of pristine In2S3 as well as many outstanding properties. Moreover, the pristine In2S3 and its derivatives with diverse synthesis routes are systematically summarized. Further, the advancement of In2S3-based photocatalytic, photoelectrocatalytic and photovoltaic systems, especially in environmental decontamination, artificial photosynthesis for renewable fuels and solar cells, are highlighted in detail. Ultimately, we conclude with a summary and propose some invigorating perspectives on the challenges from atomic (or macroscopical) structure modulation in material nature, photochemical behavior understanding to solar photovoltaic applications at the forefront of this research platform.

    Graphical abstract

    Due to the defect structure, suitable band gap, photoelectric sensitivity and low toxicity, state-of-the-art accomplishments of In2S3-based photocatalysis and photovoltaics have been achieved for solar-energy conversion and utilization. A broad photoconversion field of photochemically environmental decontamination, artificial photosynthesis for renewable fuels, and solar cells makes sense for energy and environmental issues.

    Graphical abstract for this article



  • Photochemistry of Various Acene Based Molecules

    Publication date: Available online 30 December 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Shaoqiang Dong, Albert Ong, Chunyan Chi

    Abstract

    Photochemistry based on acenes and their derivatives is one of the emerging research areas in the field of polycyclic aromatic hydrocarbons (PAHs). However, due to the increased reactivity of larger acenes towards light and singlet oxygen, it is difficult to precisely control their photochemical reactions. Therefore, the unexpected reactivity of acene-based molecules brings about two challenging topics: how to design stable acenes and how to utilize the photochemistry to design new acene-based functional materials. In this review, we first focus on the mechanism of photochemistry of acenes to theoretically understand how these reactions could have happened. Next, we will give a summary on both acene-based photocyclization and photooxidation reactions.



  • Curious behaviors of photogenerated electrons and holes at the defects on anatase, rutile, and brookite TiO2 powders: A review

    Publication date: Available online 13 December 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Akira Yamakata, Junie Jhon M. Vequizo

    Abstract

    Photocatalytic reactions are governed by photogenerated charge carriers upon band gap excitation. Therefore, for better understanding of the mechanism, the dynamics of photocarriers should be studied. One of the attractive materials is TiO2, which has been extensively investigated in the field of photocatalysis. This review article summarizes our recent works of time-resolved visible to mid-IR absorption measurements to elucidate the difference of anatase, rutile, and brookite TiO2 powders. The distinctive photocatalytic activities of these polymorphs are determined by the electron-trapping processes at the defects on powders. Powders are rich in defects and these defects capture photogenerated electrons. The depth of the trap is crystal phase dependent, and they are estimated to be < 0.1 eV, ∼0.4 eV and ∼0.9 eV for anatase, brookite, and rutile, respectively. Electron trapping reduces probability to meet with holes and then elongate the lifetime of holes. Therefore, it works negatively for the reaction of electrons but positively works for the reaction of holes. In the steady-state reactions, both electrons and holes should be consumed. Hence, the balance between the positive and negative effects of defects determines the distinctive photocatalytic activities of anatase, rutile, and brookite TiO2 powders.



  • Current status and prospects on chemical structure driven photoluminescence behaviour of carbon dots

    Publication date: December 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 37

    Author(s): Monoj Kumar Barman, Amitava Patra

    Abstract

    Fluorescent carbon dots (C-dots) are new class of nanomaterials with widespread applications in optoelectronics, bio-imaging, catalysis, and sensing. The origin of photoluminescence of carbon dots is a debatable issue which is pretend to depend on the chemical structures such as graphitic conjugated core, molecular fluorophores and the surface defect states found to be dependent on the method of preparation. In this review, we have illustrated the important issues and challenges of the luminescent carbon dots and their potential applications. Graphitic conjugated core containing carbon dots is being synthesized usually from bulk materials like graphite, graphene and graphene oxide which exhibit size dependent photoluminescence behaviour due to quantum confinement. On the other hand, carbon dots synthesized from small molecules exhibit excitation dependent emission due to the presence of surface energy trap states which can be tuned by surface modification. Again, presence of both conjugated core and surface defect generates dual emission property. It is evident that various molecular fluorophores are produced inside carbon dots during low temperature synthesis. Hetero-atom doping is another strategy to tune the photoluminescence properties of carbon dots. Red emitting carbon dots are found to be suitable for bio-imaging applications after surface modification. Again, high quantum yield and solar light absorbing carbon dots are required for light harvesting and optoelectronic applications. Surface modified carbon dots are found to be appropriate for sensing applications. Analysis reveals that carbon dots based hybrid systems provide good applicability towards construction of solar cell devices because of their efficient charge separation.

    Graphical abstract

    Chemical Structure monitors the photoluminescence properties of carbon dots

    Graphical abstract for this article



  • IFC(EDITORIAL BOARD)

    Publication date: December 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 37

    Author(s):



  • Recent advances in suppressing the photocorrosion of cuprous oxide for photocatalytic and photoelectrochemical energy conversion

    Publication date: Available online 22 October 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Cui Ying Toe, Jason Scott, Rose Amal, Yun Hau Ng

    Abstract

    The emergence of cuprous oxide (Cu2O) as a visible light active semiconductor for photocatalytic and photoelectrochemical applications has elevated significantly over the past decade. With photocorrosion identified as a severe issue for Cu2O, its photoactivity has been greatly restricted. Given that Cu2O redox potentials are located in between its band gap, the possible occurrence of self-photoreduction or self-oxidation upon illumination is inevitable. Various efforts have been directed to implement effective strategies in enhancing the photostability of Cu2O. In particular, most of the studies focused on improving the charge transfer from Cu2O to reactants or co-catalyst to avoid accumulation of charge within the particles. This review presents recent research progresses for the development of strategies to suppress Cu2O photocorrosion in regards to its intrinsic properties and charge kinetics. It is shown that effective transport of electrons or holes out of Cu2O photocatalyst by engineering its crystal structure, tuning its reaction environment or depositing secondary elements could effectively inhibit Cu2O from experiencing self-photodecomposition. Understanding of the charge dynamics with respect to its photocorrosion is pivotal to optimize the design of Cu2O photocatalyst for enhanced performance in the future.



  • 2D inorganic nanosheet-based hybrid photocatalysts: Design, applications, and perspectives

    Publication date: Available online 7 April 2018

    Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Yun Kyung Jo, Jang Mee Lee, Suji Son, Seong-Ju Hwang

    Abstract

    Highly anisotropic 2D nanosheets of inorganic solids with nanometer-level thickness attract a great deal of research activity because of their unique merits in exploring novel high performance photocatalysts applicable for environmental purification and production of renewable clean energy. The 2D inorganic nanosheets possess many valuable properties such as tailorable band structures and chemical compositions, large surface areas, well-defined defect-free surface structure, and tunable electrical conductivities. Due to these unique advantages of 2D inorganic nanosheets, these materials can be used as promising building blocks for hybrid-type photocatalysts with optimized band structures, expanded surface areas, improved charge separation behaviors, and enhanced reaction kinetics. Of prime importance is that unusually strong electronic coupling can occur between very thin 2D inorganic nanosheets and hybridized nanospecies, leading to the synergistic optimization of electronic and optical properties, and thus the remarkable enhancement of photocatalytic activity. Depending on the type of component nanosheets, diverse examples of inorganic nanosheet-based photocatalysts are presented along with the in-depth discussion about critical roles of inorganic nanosheet in these hybrid photocatalysts. Future perspectives in the researches for 2D inorganic nanosheet-based photocatalysts are discussed to offer useful directions for designing and synthesizing novel high performance photocatalysts applicable for renewable energy production and environmental purification.

    Graphical abstract

    Graphical abstract for this article



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