Special Issue "Plasmonic Photocatalysts"
Deadline for manuscript submissions: 15 November 2019
Dr. Ewa Kowalska
Institute for Catalysis, Hokkaido University, N21, W10, 001-0021 Sapporo, Japan
Website 1 | Website 2 | E-Mail
Interests: heterogeneous catalysis, photocatalysis, advanced oxidation technologies (AOTs), plasmonic photocatalyst, noble metals, antimicrobial properties, solar energy, solar fuel, faceted nanoparticles
Over the last decade, plasmonic properties of noble metals, i.e., absorption of visible light due to plasmon resonance, have been used to activate wide band-gap semiconductors. Although plasmonic properties of noble metals were observed more than a century ago, scientifically explained ca. 30 years ago, and since then commercially used in many fields, the examination of their application for photocatalysis started a few years ago. Despite the novelty of plasmonic photocatalysis, many studies have already been performed to improve photocatalytic activity and stability, and to clarify the mechanism under irradiation with visible light.
Although desirable photoabsorption properties of plasmonic photocatalysts can be easily achieved by preparation of nanoparticles of different sizes and shapes, their photocatalytic activities (under visible light irradiation) are still low and must be improved for commercial usage. Therefore, various studies have been performed to get stable and highly active materials. Moreover, the mechanism of plasmonic photocatalysis has not been clarified yet, i.e., charge versus energy transfer. It is thought that the mechanism depends directly on the morphology of plasmonic photocatalysts and reaction conditions.
Despite the novelty and unclear mechanism, plasmonic photocatalysts have already proved to be highly efficient for environmental purification (water and wastewater treatment, air purification and self-cleaning surfaces for decomposition of both organic compounds and microorganisms), solar energy conversion (photocurrent generation and water splitting) and synthesis of organic compounds. Therefore, it is believed that plasmonic photocatalysts have the potential to be efficient solar photocatalysts for commercial application.
This Special Issue of Catalysts will be a collaborative effort to combine current research on plasmonic photocatalysis. Contributions on photocatalyst preparation and characterization, reaction mechanism, theoretical modeling and applications are all welcome.
Prof. Dr. Ewa Kowalska
Manuscript Submission Information
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- Plasmonic photocatalysis
- Photocatalyst fabrication
- Simulation and modeling of plasmon resonance
- Mechanism study
- Environmental purification
- Energy conversion
- Water splitting
- New techniques of photocatalyst characterization
- Morphology-governed activity
- Removal of microbiological pollutants
- Water/wastewater treatment
- Air treatment
- Self-cleaning surfaces
- Theoretical study
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Recent advance in the design and mechanistic study of plasmonic photocatalysts
Authors: Hyeon Ho Shin, Yung Doug Suh, Dong-Kwon Lim.
Abstract: Plasmonic nanostructures can be employed for performing photocatalytic reactions with visible-light illumination involving two different possible mechanisms, namely, the near-field enhancement and/or direct hot-electron transfer to the conduction band of an active catalyst. In this regard, we will introduce the basic concept of plasmonic nanomaterial-based photocatalysts for various chemical reactions developed in recent 10 years. We will discuss the key progress in the design and mechanistic understandings of plasmonic nanomaterial-based photocatalysts. The benefit, shortcoming points and perspective are also will be discussed in detail.
Title: TiO2/CuxO photocatalysis by Schottky barriers vs surface plasmon resonance showing a dual behavior when activated by solar or visible light: Critical issues
Authors: Sami Rtimia, Victor Nadtochenkob, Inessa Kmehl and John Kiwia*
Affiliations: a Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-1015, Lausanne, Switzerland,
b Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka Russia,
cInstitute of Molecular Genetics, Russian Academy of Sciences, Kurchatov sq.2, 123182, Moscow, Russia
Abstract: This mini-review addresses the different reactivity and mechanism on TiO2/CuxO catalytic surfaces when irradiated by solar light or by visible light since these leads to reaction proceeding through a Schottky type mechanism under solar light or by a surface plasmon resonance mechanism where the CuxO is activated by visible light and transfer its charge by an interfacial charge transfer (IFCT) to the TiO2. Evidence is presented for the TiO2 films reacting under light as semiconductors in these double double-oxide films. The CuxO seems not only to extend the films absorption in the visible region of TiO2 but added in ppb/ppm amounts accelerate drastically bacterial degradation. TiO2/CuxO films have also been reported to accelerate non-biodegradable pollutant degradation in solution and finally these films play an active role during the photo-activated self-cleaning induced by uniform, adhesive and mechanically resistant TiO2/CuxO sputtered films. The doping or decoration of by CuxO of semiconductor base films in the dark or under light lead to a noticeable increase in the production of reactive oxygen species (ROS). These ROS-radicals present highly oxidation potential improving the degradation of organic compounds as reported in the last decade. This issue is described/discussed in the present review. Furthermore, CuxO-sputtered on double oxide substrates (TiO2/ZrO2) have been reported to present a higher efficiency in ecological relevant processes compared to TiO2/CuxO, although the role of the double-oxide substrate is not fully understood at the present time. The power applied on the Cu-target during the sputtering process on was observed to play a significant role on the bacterial inactivating kinetics.
Keywords: sputtered films, mechanistic issues, Schottky barriers, surface plasmon resonance, bacterial degradation, emerging pollutants, self-cleaning surfacess, ROS