Phase Transformation Strategies for the Construction of Heterojunction TiO<sub>2</sub> Photocatalysts

Wang, Pei; Song, Weina; Li, Wei

doi:10.1002/cctc.202301489

ChemCatChem

2024

DOI: 10.1002/cctc.202301489

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Phase Transformation Strategies for the Construction of Heterojunction TiO₂ Photocatalysts

Pei Wang,

Weina Song,

Wei Li

Abstract: Heterojunction TiO2 has attracted great attention in photocatalytic applications due to its high efficiency in the separation of photogenerated electron‐hole pairs and strong ability of light absorption. This work concisely summarizes the distinct crystal phases of TiO2 and elucidates the prevalent methods employed in the synthesis of TiO2 heterojunctions. Furthermore, the review highlights novel strategies for the realization of TiO2 phase transformation, thereby contributing to a deeper understanding and adv… Show more

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In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

Assayehegn,

Solaiappan,

Gidey

et al. 2024

Global Challenges

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Visible‐light active anatase/brookite/rutile (A/B/R) ternary N‐doped titania (N/TiO2) crystals are successfully prepared by a facile sol‐gel method using titanium butoxide and benign N‐dopant source, guanidinium chloride. Systematically varying the aging time (1, 4, 8, and 12 d), its influence on physicochemical properties of as‐obtained spherical heterojunction nanomaterials is studied. Detailed characterizations confirm that a substantial amount of anatase (88% to 50%) is transformed to rutile (2% to 38%) via intermediate brookite phase (9% to 25%) as the function of aging time; not only the A/B/R phase content of the samples is tuned by sol‐gel aging time of the precursors solution but also their optical‐response and methylene blue photocatalytic properties are profoundly dictated. Notably under visible‐light irradiation, the photostable rutile rich mesoporous A/B/R triphasic N/TiO2 (50% A, 12% B, 38% R) aged for 12 d demonstrates higher degradation activity (97%) with a faster degradation rate (0.033 min−1) than both lesser aged N/TiO2 and undoped titania. This enhancement is attributed to the synergistic effect of interstitial‐N‐doping and optimal A/B/R interfacial charge transfer that leads to higher light absorption, lower bandgap energy and well‐separated charge carriers. The current work provides a new perspective for designing highly active visible‐light heterostructure nanomaterials with controllable phase composition.

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In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

Assayehegn,

Solaiappan,

Gidey

et al. 2024

Global Challenges

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Simultaneously Producing H₂ and H₂O₂ by Photocatalytic Water Splitting: Recent Progress and Future

Cao,

Sun,

Peng

et al. 2024

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The solar‐driven overall water splitting (2H2O→2H2 + O2) is considered as one of the most promising strategies for reducing carbon emissions and meeting energy demands. However, due to the sluggish performance and high H2 cost, there is still a big gap for the current photocatalytic systems to meet the requirements for practical sustainable H2 production. Economic feasibility can be attained through simultaneously generating products of greater value than O2, such as hydrogen peroxide (H2O2, 2H2O→H2 + H2O2). Compared with overall water splitting, this approach is more kinetically feasible and generates more high‐value products of H2 and H2O2. In several years, there has been an increasing surge in exploring the possibility and substantial progress has been achieved. In this review, a concise overview of the importance and underlying principles of PIWS is first provided. Next, the reported typical photocatalysts for PIWS are discussed, including commonly used semiconductors and cocatalysts, essential design features of these photocatalysts, and connections between their structures and activities, as well as the selected approaches for enhancing their stability. Then, the techniques used to quantify H2O2 and the operando characterization techniques that can be employed to gain a thorough understanding of the reaction mechanisms are summarized. Finally, the current existing challenges and the direction needing improvement are presented. This review aims to provide a thorough summary of the most recent research developments in PIWS and sets the stage for future advancements and discoveries in this emerging area.

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Phase Transformation Strategies for the Construction of Heterojunction TiO₂ Photocatalysts

Cited by 2 publications

References 148 publications

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

Simultaneously Producing H₂ and H₂O₂ by Photocatalytic Water Splitting: Recent Progress and Future

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Phase Transformation Strategies for the Construction of Heterojunction TiO2 Photocatalysts

Cited by 2 publications

References 148 publications

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO2 Nanocrystals as Sustainable Visible‐Light Catalysts

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO2 Nanocrystals as Sustainable Visible‐Light Catalysts

Simultaneously Producing H2 and H2O2 by Photocatalytic Water Splitting: Recent Progress and Future

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Product

Resources

About

Phase Transformation Strategies for the Construction of Heterojunction TiO₂ Photocatalysts

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

In Situ Driven Formation of Anatase/Brookite/Rutile Heterojunction N/TiO₂ Nanocrystals as Sustainable Visible‐Light Catalysts

Simultaneously Producing H₂ and H₂O₂ by Photocatalytic Water Splitting: Recent Progress and Future