Recent advances in non-metals-doped TiO2 nanostructured photocatalysts for visible-light driven hydrogen production, CO2 reduction and air purification

Patil, Shivaraj B.; Basavarajappa, Patil S.; Nagaraju, G.; Jyothi, M.S.; Raghu, A. V.; Reddy, Kakarla Raghava

doi:10.1016/j.ijhydene.2019.03.164

Cited by 235 publications

(74 citation statements)

References 148 publications

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“…Such a negative tendency can be improved by controlling the recombination rate [75], as also described in detail in the case of the composite materials used for water purification. The second process is the separation of photogenerated charge carriers that favor H2 evolution, also mentioned above in the case of water purification, but here with more important role [111].…”

Section: Photocatalytic Water Splittingmentioning

confidence: 89%

“…Photocatalytic water splitting implies a non-spontaneous process, where the light photons are used to break the water molecules assisted by a photocatalyst, which generates photoexcited charge carriers, i.e., e − /h + pairs, delivering them to the solid-liquid interface, where the redox half-reactions of water oxidation and reduction are catalyzed [110,111], analogously, as described above for photocatalytic water treatment. The difference in water splitting is that photogenerated charges (i.e., e − and h + ) need to react with H + as the electron acceptor adsorbed on the photocatalyst surface or within the surrounding electrical double layer of the charged particles in order to generate H 2 [112], instead of O 2 generating O 2…”

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

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Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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Clean water and the increased use of renewable energy are considered to be two of the main goals in the effort to achieve a sustainable living environment. The fulfillment of these goals may include the use of solar-driven photocatalytic processes that are found to be quite effective in water purification, as well as hydrogen generation. H2 production by water splitting and photocatalytic degradation of organic pollutants in water both rely on the formation of electron/hole (e−/h+) pairs at a semiconducting material upon its excitation by light with sufficient photon energy. Most of the photocatalytic studies involve the use of TiO2 and well-suited model compounds, either as sacrificial agents or pollutants. However, the wider application of this technology requires the harvesting of a broader spectrum of solar irradiation and the suppression of the recombination of photogenerated charge carriers. These limitations can be overcome by the use of different strategies, among which the focus is put on the creation of heterojunctions with another narrow bandgap semiconductor, which can provide high response in the visible light region. In this review paper, we report the most recent advances in the application of TiO2 based heterojunction (semiconductor-semiconductor) composites for photocatalytic water treatment and water splitting. This review article is subdivided into two major parts, namely Photocatalytic water treatment and Photocatalytic water splitting, to give a thorough examination of all achieved progress. The first part provides an overview on photocatalytic degradation mechanism principles, followed by the most recent applications for photocatalytic degradation and mineralization of contaminants of emerging concern (CEC), such as pharmaceuticals and pesticides with a critical insight into removal mechanism, while the second part focuses on fabrication of TiO2-based heterojunctions with carbon-based materials, transition metal oxides, transition metal chalcogenides, and multiple composites that were made of three or more semiconductor materials for photocatalytic water splitting.

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Section: Photocatalytic Water Splittingmentioning

confidence: 89%

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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“…Owing to its nontoxicity, low cost, good chemical stability, and band energy levels suitable for excitation under UV–vis irradiation, titanium dioxide and its doped variants are considered among the most viable electrode materials for photocatalytic applications, such as water and air depollution, water splitting and CO 2 reduction. [ 1–8 ] Out of all techniques for the growth of thin films for photoelectrodes preparation, [ 9–11 ] Plasma Electrolytic Oxidation (PEO) allows to easily synthesize photoactive TiO 2 layers with tuned crystalline phase composition [ 12–14 ] and dosage of doping elements. [ 15–21 ]…”

Section: Introductionmentioning

confidence: 99%

Single‐Step Preparation of Large Area TiO₂ Photoelectrodes for Water Splitting

Schäfers

Arab

Chiarello

et al. 2020

Advanced Energy Materials

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The fast, single‐step and easily scalable production by plasma electrolytic oxidation (PEO) of large area TiO2 electrodes with excellent photoactivity in water splitting under simulated solar light is systematically investigated here. In particular, the effects that the cell voltage (100–180 V) and the processing time (0.5–15 min) have on the electrode properties are studied. The PEO‐produced oxide layers are porous, the predominant crystalline structure shifting from anatase, to an anatase‐rutile mixture, and finally to rutile by rising the cell voltage. The electrodes show a double‐layered structure, with a more compact layer at the interface with the titanium substrate and a thick porous layer on the external surface. The photocurrent density versus wavelength reflects the phase composition, with a maximum incident photon‐to‐current efficiency of 90% at 320 nm. The highest H2 production rate is attained with the mixed anatase‐rutile electrode prepared by 300 s‐long PEO at 150 V.

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“…Inspired by nature processes, scientists have made remarkable efforts toward the development of efficient photocatalysts to facilitate chemical reactions with assistance from solar energy. 2,3 Among the intensely investigated systems, homogeneous molecular photocatalysts have led the earlier discoveries of photocatalysis, where the established examples are transition metal complexes [4][5][6] and organic dyes. 7 Despite the performance, several drawbacks are still associated with homogeneous photocatalysts, to name but a few, toxicity of metals, high cost, and stability issues due to the photo-bleaching effect.…”

Section: Introductionmentioning

confidence: 99%

Designing conjugated porous polymers for visible light-driven photocatalytic chemical transformations

2020

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Recent advances in non-metals-doped TiO2 nanostructured photocatalysts for visible-light driven hydrogen production, CO2 reduction and air purification

Cited by 235 publications

References 148 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Single‐Step Preparation of Large Area TiO₂ Photoelectrodes for Water Splitting

Designing conjugated porous polymers for visible light-driven photocatalytic chemical transformations

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Recent advances in non-metals-doped TiO2 nanostructured photocatalysts for visible-light driven hydrogen production, CO2 reduction and air purification

Cited by 235 publications

References 148 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Single‐Step Preparation of Large Area TiO2 Photoelectrodes for Water Splitting

Designing conjugated porous polymers for visible light-driven photocatalytic chemical transformations

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Product

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Single‐Step Preparation of Large Area TiO₂ Photoelectrodes for Water Splitting