Phase-selective modulation of TiO2 for visible light-driven C H arylation: Tuning of absorption and adsorptivity

Bak, Sora; Lee, Sae Mi; Hwang, Hee Min; Lee, Hyoyoung

doi:10.1016/j.mcat.2019.04.017

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…2 e, f). Our group has applied BTO to promote green energy and social sustainability in the field of hydrogenation [ 21 ], algae elimination from aquatic ecosystems [ 31 ], carbon dioxide (CO 2 ) reduction [ 28 , 32 ], and visible-light-driven organic synthesis (C–H arylation) [ 33 ]. Next, we describe those BTO applications and then propose strategies and directions for further designs and applications of BTO.…”

Section: Explored and Potential Applications Of Btomentioning

confidence: 99%

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Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Luo

Lee

2021

Nano-Micro Lett.

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Titanium dioxide (TiO2) has garnered attention for its promising photocatalytic activity, energy storage capability, low cost, high chemical stability, and nontoxicity. However, conventional TiO2 has low energy harvesting efficiency and charge separation ability, though the recently developed black TiO2 formed under high temperature or pressure has achieved elevated performance. The phase-selectively ordered/disordered blue TiO2 (BTO), which has visible-light absorption and efficient exciton disassociation, can be formed under normal pressure and temperature (NPT) conditions. This perspective article first discusses TiO2 materials development milestones and insights of the BTO structure and construction mechanism. Then, current applications of BTO and potential extensions are summarized and suggested, respectively, including hydrogen (H2) production, carbon dioxide (CO2) and nitrogen (N2) reduction, pollutant degradation, microbial disinfection, and energy storage. Last, future research prospects are proposed for BTO to advance energy and environmental sustainability by exploiting different strategies and aspects. The unique NPT-synthesized BTO can offer more societally beneficial applications if its potential is fully explored by the research community.

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Section: Explored and Potential Applications Of Btomentioning

confidence: 99%

“…C–H arylation for organic synthesis was chosen as a typical study case to show the photocatalytic activity of BTO (Fig. 3 e) [ 33 ]. The phase-mixed BTO absorbs light in the visible range through its Ti 3+ defect-rich disordered state.…”

Section: Explored and Potential Applications Of Btomentioning

confidence: 99%

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Luo

Lee

2021

Nano-Micro Lett.

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“…In this study, we demonstrate that blue Li-reduced TiO 2 nanoparticles − decorated with Cu/Co dual-single atoms (Cu–Co SA/BTO) exhibit remarkable photocatalytic H 2 performance from pure water in the absence of a sacrificial agent. Specifically, the H 2 evolution yield reaches 1238.15 μmol·g –1 ·h –1 over Cu–Co SA/BTO, which is 11 times higher than those of BTO.…”

Section: Introductionmentioning

confidence: 77%

Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H₂ Evolution

Liang,

Shao,

Cho

et al. 2024

ACS Sustainable Chem. Eng.

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The challenge of achieving efficient photocatalytic H2 production from water splitting without sacrificial agents remains a significant hurdle. Herein, we demonstrate that the dual doping of Cu/Co single atoms on Li-reduced blue TiO2 (Cu–Co SA/BTO) can effectively modulate the charge separation of photogenerated carriers during photocatalytic pure water splitting. Remarkably, the H2 evolution rate of Cu–Co SA/BTO achieves a remarkable value of 1238.15 μmol·g–1·h–1, surpassing that of BTO by 11 times. Particularly, femtosecond transient absorption spectroscopy (fs-TA) and differential charge densities reveal that the efficient electron–hole separation originates from the doping of Cu/Co dual-single atoms. The doping of Cu single atoms boosts electron transfer from the TiO2 conduction band to Cu atoms, while the doping of Co single atoms facilitates photogenerated hole migration to Co single atoms from TiO2. This work establishes a promising photocatalyst design strategy for achieving highly efficient H2 evolution through pure water splitting, marking a significant step toward sustainable and green energy production.

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“…The selective reduction TiO 2 synthesis method was reported in our previous research work [ 8 , 14 , 15 , 24 ]. First, 1 g of TiO 2 nanoparticles (Degussa P25, 20–40 nm) were added into the 300-ml three-neck round-bottom-flask (RBF), which contained 100 ml EDA.…”

Section: Experimental Methodsmentioning

confidence: 99%

Binder-free TiO2 hydrophilic film covalently coated by microwave treatment

Luo

Wang

Hwang

et al. 2021

Materials Chemistry and Physics

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A binder-free attachment method for TiO 2 on a substrate has been sought to retain high active photocatalysis. Here, we report a binder-free covalent coating of phase-selectively disordered TiO 2 on a hydroxylated silicon oxide (SiO 2 ) substrate through rapid microwave treatment. We found that Ti–O–Si and Ti–O–Ti bonds were formed through a condensation reaction between the hydroxyl groups of the disordered TiO 2 and Si substrate, and the disordered TiO 2 nanoparticles themselves, respectively. This covalent coating approach can steadily hold the active photocatalytic materials on the substrates and provide long-term stability. The binder-free disordered TiO 2 coating film can have a thickness (above 38 μm) with high surface integrity with a strong adhesion force (15.2 N) against the SiO 2 substrate, which leads to the production of a rigid and stable TiO 2 film. This microwave treated TiO 2 coating film showed significant volatile organic compounds degradation abilities under visible light irradiation. The microwave coated selectively reduced TiO 2 realized around 75% acetaldehyde degradation within 12 h and almost 90% toluene degradation after 9 h, also retains stable photodegradation performance during the cycling test. Thus, the microwave coating approach allowed the preparation of the binder-free TiO 2 film as a scalable and cost-effective method to manufacture the TiO 2 film that shows an excellent coating quality and strengthens the application as a photocatalyst under severe conditions.

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Phase-selective modulation of TiO2 for visible light-driven C H arylation: Tuning of absorption and adsorptivity

Cited by 6 publications

References 34 publications

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H₂ Evolution

Binder-free TiO2 hydrophilic film covalently coated by microwave treatment

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Phase-selective modulation of TiO2 for visible light-driven C H arylation: Tuning of absorption and adsorptivity

Cited by 6 publications

References 34 publications

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H2 Evolution

Binder-free TiO2 hydrophilic film covalently coated by microwave treatment

Contact Info

Product

Resources

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Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H₂ Evolution