Journal ArticleDOI
Photocatalysis on TiO2 Surfaces - Principles, Mechanisms, and Selected Results
TLDR
In this article, the authors focus on interfacial processes and summarize some of the operating principles of heterogeneous photocatalysis systems, including the electron transfer and energy transfer processes in photocatalytic reactions.Abstract:
In 1972, Fujishima and Honda discovered the photocatalytic splitting of water on TiO{sub 2} electrodes. This event marked the beginning of a new era in heterogeneous photocatalysis. Since then, research efforts in understanding the fundamental processes and in enhancing the photocatalytic efficiency of TiO{sub 2} have come from extensive research performed by chemists, physicists, and chemical engineers. Such studies are often related to energy renewal and energy storage. In recent years, applications to environmental cleanup have been one of the most active areas in heterogeneous photocatalysis. This is inspired by the potential application of TiO{sub 2}-based photocatalysts for the total destruction of organic compounds in polluted air and wastewaters. There exists a vast body of literature dealing with the electron transfer and energy transfer processes in photocatalytic reactions. A detailed description of these processes is beyond the scope of this review. Here, the authors tend to focus on interfacial processes and to summarize some of the operating principles of heterogeneous photocatalysis. In section 2, the authors first look at the electronic excitation processes in a molecule and in a semiconductor substrate. The electronic interaction between the adsorbate molecule and the catalyst substrate is discussed in terms of the catalyzed ormore » sensitized photoreactions. In section 3, thermal and photocatalytic studies on TiO{sub 2} are summarized with emphasis on the common characteristics and fundamental principles of the TiO{sub 2}-based photocatalysis systems. In section 4, they address the research effort in the electronic modification of the semiconductor catalysts and its effect on the photocatalytic efficiency. Several representative examples will be presented including the Schottky barrier formation and modification at metal-semiconductor interfaces. Some concluding remarks and future research directions will be given in the final section. 160 refs.« lessread more
Citations
More filters
Journal ArticleDOI
Water- and Oxygen-Induced Decay Kinetics of Photogenerated Electrons in TiO2 and Pt/TiO2: A Time-Resolved Infrared Absorption Study
TL;DR: In this article, photogenerated in TiO2 and Pt/TiO2 catalysts were observed by time-resolved IR absorption spectroscopy, and the absorption was attributed to optical transition of photoggenerated electrons trapped in shallow midgap states.
Journal ArticleDOI
Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties
Stefan G. Ebbinghaus,Hans-Peter Abicht,Richard Dronskowski,Thomas Müller,Armin Reller,Anke Weidenkaff +5 more
TL;DR: In this paper, the thermal and chemical stability of oxynitride perovskites are investigated and their applications in different photocatalytic reactions are discussed and various physical characteristics like electrical and thermal transport parameters and dielectric properties are described.
Journal ArticleDOI
Coupling surface plasmon resonance of gold nanoparticles with slow-photon-effect of TiO2 photonic crystals for synergistically enhanced photoelectrochemical water splitting
TL;DR: In this paper, a photoelectrochemical (PEC) water splitting activity in visible light was attributed to the energetic hot electrons and holes that were generated in the Au NPs through the excitation and decay of surface plasmons.
Journal ArticleDOI
Stable blue TiO2−x nanoparticles for efficient visible light photocatalysts
TL;DR: In this paper, an effective strategy for the large-scale synthesis of blue titania with Ti3+ localized in the core of TiO2−x nanoparticles (NPs) based on Le Chatelier's principle was developed.
Journal ArticleDOI
Metal oxide photoelectrodes for hydrogen generation using solar radiation-driven water splitting
TL;DR: In this article, the authors present results in this field obtained both worldwide and by the authors of this paper, and the factors determining the efficiency of photoelectrolysis and possible ways to increase the photocatalytic activity of semiconductor photo-electrodes are analyzed.
References
More filters
Book
Principles of Instrumental Analysis
TL;DR: In this article, the authors present an overview of the main components of optical atomic spectrometers and their application in the field of surface characterization by Spectroscopy and Microscopy.
Book
Photocatalysis: Fundamentals and Applications
Ezio Pelizzetti,Nick Serpone +1 more
TL;DR: In this paper, the reader is first introduced to the meaning of photocatalysis and subsequently taken through the essentials of photochemistry towards bridging it to semiconductor materials, followed by thermodynamic and kinetic aspects.
Related Papers (5)
Electrochemical Photolysis of Water at a Semiconductor Electrode
Akira Fujishima,Kenichi Honda +1 more