Sensitization of<scp>TiO<sub>2</sub></scp>by Dyes: A Way to Extend the Range of Photocatalytic Activity of<scp>TiO<sub>2</sub></scp>to the Visible Region

Litter, Marta I.; Román, Enrique San; Grela, the late María A.; Meichtry, Jorge M.; Rodríguez, Hernán B.

doi:10.1002/9783527808175.ch10

Cited by 12 publications

(9 citation statements)

References 156 publications

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“…Numerous research works have used this technique for reduction of CO 2 . However, the efficiency of CO 2 conversion into other hydrocarbons and methane is minimal [ 102 , 103 , 104 ].…”

Section: Tio 2 -Based Photocatalysts For Co ...mentioning

confidence: 99%

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

et al. 2022

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Photocatalytic CO2 reduction is a most promising technique to capture CO2 and reduce it to non-fossil fuel and other valuable compounds. Today, we are facing serious environmental issues due to the usage of excessive amounts of non-renewable energy resources. In this aspect, photocatalytic CO2 reduction will provide us with energy-enriched compounds and help to keep our environment clean and healthy. For this purpose, various photocatalysts have been designed to obtain selective products and improve efficiency of the system. Semiconductor materials have received great attention and have showed good performances for CO2 reduction. Titanium dioxide has been widely explored as a photocatalyst for CO2 reduction among the semiconductors due to its suitable electronic/optical properties, availability at low cost, thermal stability, low toxicity, and high photoactivity. Inspired by natural photosynthesis, the artificial Z-scheme of photocatalyst is constructed to provide an easy method to enhance efficiency of CO2 reduction. This review covers literature in this field, particularly the studies about the photocatalytic system, TiO2 Z-scheme heterojunction composites, and use of transition metals for CO2 photoreduction. Lastly, challenges and opportunities are described to open a new era in engineering and attain good performances with semiconductor materials for photocatalytic CO2 reduction.

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“…Numerous research works have used this technique for reduction of CO 2 . However, the efficiency of CO 2 conversion into other hydrocarbons and methane is minimal [ 102 , 103 , 104 ].…”

Section: Tio 2 -Based Photocatalysts For Co ...mentioning

confidence: 99%

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

et al. 2022

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“…In the last decade, different methodologies have been attempted to improve TiO 2 photoactivity in the visible region ( e.g. , doping, − semiconductor coupling, − transition-metal coupling, − and sensitization with both synthetic , and natural dyes − ). Among such strategies, the use of synthetic dyes as sensitizers is an efficient process for TiO 2 modification.…”

Section: Introductionmentioning

confidence: 99%

Zn(II)-tetracarboxy-phthalocyanine-Sensitized TiO₂ Thin Films as Antimicrobial Agents under Visible Irradiation: a Combined DFT and Experimental Study

et al. 2021

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In this article, we studied the antimicrobial activity of TiO2 sensitized by the Zn(II)-tetracarboxy-phthalocyanine (TcPcZn) complex using TiO2-Degussa P25 as a semiconductor source. The TiO2 thin films were deposited by the doctor blade method and were sensitized by the chemisorption process. The obtained compounds were characterized using Fourier transform infrared spectroscopy, UV–vis spectrophotometry, Raman spectroscopy, diffuse reflectance spectroscopy, and scanning electron microscopy. Furthermore, we studied the stability of the adsorbed sensitizer on the semiconductor surface by using the density functional theory (DFT). Additionally, we determined the antimicrobial activity of TcPcZn–TiO2 against methicillin-resistant Staphylococcus aureus (MRSA). The Raman and optical results confirmed the sensitizing process. The TcPcZn–TiO2 thin films showed radiation absorption in the visible range of the electromagnetic spectrum (600–750 nm), and the dye anchored on the TiO2 surface had a band gap of 1.58 eV. The DFT study showed that TcPcZn supported on any phase of Degussa P25 is stable, making them suitable to act as catalysts in the proposed reactions. Finally, the TcPcZn–TiO2 thin films reached 76.5% of inhibition activity against MRSA.

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“…Titanium dioxide (TiO 2 ) is the most widely studied material for photoelectrocatalysis due to its stability over a wide range of conditions and favorable energy levels. , However, it is inefficient in harvesting the solar spectrum because it can absorb only the UV part of the broad solar spectrum due to its wide bandgap of 3.2 eV . The absorption range of TiO 2 can be enhanced by sensitization with dyes, quantum dots (QDs), and metal nanoclusters (NCs). − NCs are a relatively newer addition to the sensitizer family. Therefore, despite their great potential, there is still a lack of understanding about the NC-sensitized TiO 2 (NC–TiO 2 ) system.…”

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confidence: 99%

Surface State-Assisted Delayed Photocurrent Response of Au Nanocluster/TiO₂ Photoelectrodes

Abbas

Bang

2022

ACS Appl. Mater. Interfaces

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Gold nanoclusters (NCs) can be used as sensitizers to extend the absorption capabilities of TiO2 as photoelectrodes. However, the adsorption of NCs also creates additional surface states on the TiO2 surface, which gives rise to intricacies in the understanding of various interfacial phenomena occurring in NC-sensitized TiO2. One of the complexities that have recently been discovered is the size-dependent hole-transfer mechanism. In this work, we reveal another anomalous behavior in the hole-transfer process that the hole scavenging ability of the electrolyte also plays a role in determining the hole-transfer mechanism in the NC-TiO2 system, which is unprecedented in other photoelectrode systems. In the presence of an efficient hole scavenger (Na2SO3), the hole transfer in Au18–TiO2 occurs directly through the highest occupied molecular orbital (HOMO) of Au18 NCs. However, in the presence of a less efficient hole scavenger (ethylenediaminetetraacetic acid), hole transfer in Au18–TiO2 does not occur through the HOMO and shifts to surface state-assisted hole transfer. Due to surface state charging, this surface state-assisted hole-transfer mechanism results in delayed photocurrent response in Au18–TiO2. Evidence for this exotic hole-transfer mechanism shift is provided by photoelectrochemical electrochemical impedance spectroscopy, and its implications are discussed.

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Sensitization ofTiO₂by Dyes: A Way to Extend the Range of Photocatalytic Activity ofTiO₂to the Visible Region

Cited by 12 publications

References 156 publications

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Zn(II)-tetracarboxy-phthalocyanine-Sensitized TiO₂ Thin Films as Antimicrobial Agents under Visible Irradiation: a Combined DFT and Experimental Study

Surface State-Assisted Delayed Photocurrent Response of Au Nanocluster/TiO₂ Photoelectrodes

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Sensitization ofTiO2by Dyes: A Way to Extend the Range of Photocatalytic Activity ofTiO2to the Visible Region

Cited by 12 publications

References 156 publications

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Zn(II)-tetracarboxy-phthalocyanine-Sensitized TiO2 Thin Films as Antimicrobial Agents under Visible Irradiation: a Combined DFT and Experimental Study

Surface State-Assisted Delayed Photocurrent Response of Au Nanocluster/TiO2 Photoelectrodes

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Sensitization ofTiO₂by Dyes: A Way to Extend the Range of Photocatalytic Activity ofTiO₂to the Visible Region

Zn(II)-tetracarboxy-phthalocyanine-Sensitized TiO₂ Thin Films as Antimicrobial Agents under Visible Irradiation: a Combined DFT and Experimental Study

Surface State-Assisted Delayed Photocurrent Response of Au Nanocluster/TiO₂ Photoelectrodes