Boosting visible-light-driven photocatalytic performance of waxberry-like CeO2 by samarium doping and silver QDs anchoring

Yang, Hui; Xu, Bin; Zhang, Qitao; Yuán, Sàisài; Zhang, Zhipeng; Liu, Yiting; Nan, Zhaodong; Zhang, Ming; Ohno, Teruhisa

doi:10.1016/j.apcatb.2020.119845

Cited by 57 publications

(29 citation statements)

References 45 publications

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“…[56,57] Furthermore, the delocalized state densities of photogenerated electrons and holes for the CTFs were investigated by the electron delocalization index (EDI, Figure S32b, Supporting Information) and hole localization index (HDI, Figure S32c, Supporting Information). [58,59] The intensities of EDI and HDI increase from Dc-CTF (ES1-ES2), Bpu-CTF (ES1-ES3) to Bpt-CTF (ES4-ES9), showing the highest concentrations of electrons and holes in Bpt-CTF, which allow to provide faster ORR kinetics, in accordance with ORR polarization curves results (Figure S33, Supporting Information). [60] As a result, Bpt-CTF exhibited a significantly higher H 2 O 2 selectivity (around ≈73%) than that of Bpu-CTF (≈68%) and Dc-CTF (≈20%) (Figure S34, Supporting Information).…”

Section: Resultssupporting

confidence: 79%

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

et al. 2022

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Two‐electron oxygen photoreduction to hydrogen peroxide (H2O2) is seriously inhibited by its sluggish charge kinetics. Herein, a polarization engineering strategy is demonstrated by grafting (thio)urea functional groups onto covalent triazine frameworks (CTFs), giving rise to significantly promoted charge separation/transport and obviously enhanced proton transfer. The thiourea‐functionalized CTF (Bpt‐CTF) presents a substantial improvement in the photocatalytic H2O2 production rate to 3268.1 µmol h−1 g−1 with no sacrificial agents or cocatalysts that is over an order of magnitude higher than unfunctionalized CTF (Dc‐CTF), and a remarkable quantum efficiency of 8.6% at 400 nm. Mechanistic studies reveal the photocatalytic performance is attributed to the prominently enhanced two‐electron oxygen reduction reaction by forming endoperoxide at the triazine unit and highly concentrated holes at the thiourea site. The generated O2 from water oxidation is subsequently consumed by the oxygen reduction reaction (ORR), thereby boosting overall reaction kinetics. The findings suggest a powerful functional‐groups‐mediated polarization engineering method for the development of highly efficient metal‐free polymer‐based photocatalysts.

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Section: Resultssupporting

confidence: 79%

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

et al. 2022

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“…Hence, it's understandable that the substitution of suitable dopants readily affects the chemical bond environment of Ce-O by the reduction from Ce 4+ to Ce 3+ , and this is also the primary cause of the concentration of oxygen vacancies (O Vacancy ) increasing. 28,29 In addition, three types of oxygen species from the O1s electron core level were confirmed after deconvolution, which can be ascribed to lattice oxygen (O Lattice ), oxygen vacancies (O Vacancy ), and active surface oxygen (O Surface ) (Fig. 3b).…”

Section: Catalysis Science and Technology Papermentioning

confidence: 90%

“…3b). 28,29 Compared with pure CeO 2 , the BE of these oxygen species obviously shifts towards a higher BE after N and S doping. It should be noted that doping mainly affects the peak area (18.5%) of O Vacancy , and its concentration in NS-CeO 2 is much superior to pure CeO 2 (7.78%).…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

Nitrogen and sulfur co-doped CeO₂ nanorods for efficient photocatalytic VOCs degradation

Yang

Jia

Haraguchi

et al. 2022

Catal. Sci. Technol.

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“…In the Cu‐doped CeO 2‐x , the introduction of Cu not only increased the concentration of oxygen vacancies but also protected oxygen vacancies from being occupied [48] . Similarly, Sm‐doped CeO 2 nanomaterial was hybridized with Ag quantum dots to generate oxygen vacancies for capturing the photoproduced electrons and constructing a new transition state between the CB and VB, which can effectively separate electrons and holes [49] . Moreover, these trapped electrons promptly transferred to the co‐catalytic sites of coated Ag quantum dots, increasing the absorption utilization for visible light significantly.…”

Section: Emerging Hybrid Systems Containing Metalsmentioning

confidence: 99%

Metal‐facilitated Photocatalytic Nanohybrids: Rational Design and Promising Environmental Applications

Guan

Zhang

Neng

et al. 2021

Chemistry An Asian Journal

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As a promising technique to potentially address the energy crisis and environmental issues, photocatalysis has been reported widely to exhibit various outstanding behaviors in production of new fuels/chemicals and treatment of contaminants. The photocatalytic performance is extremely dependent on the used photocatalysts, so that the design and preparation of efficient photocatalysts are critically important for significantly improving the photocatalytic activity. Among various strategies, the hybridization of metal with semiconductors has recently been attracting more and more research interest owing to their expended spectral absorption, promoted transferring rate of charge carriers and Plasmon‐enhanced effect. In this minireview, the metal‐facilitated hybrid photocatalysts are overviewed comprehensively to first reveal unique functions of metals in improvement of photoactivity and summarize the emerging metal‐involved hybrid systems. Subsequently, the synthetic methods towards hybrid photocatalysts are introduced and their practical applications are emphasized in environmental remediation including degradation of organic pollutants, conversion of harmful gases, treatment of heavy metal ions and sterilization of bacteria. At the end, the challenges for industrializing these hybrid photocatalysts are discussed carefully and future development is suggested rationally.

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Boosting visible-light-driven photocatalytic performance of waxberry-like CeO2 by samarium doping and silver QDs anchoring

Cited by 57 publications

References 45 publications

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

Nitrogen and sulfur co-doped CeO₂ nanorods for efficient photocatalytic VOCs degradation

Metal‐facilitated Photocatalytic Nanohybrids: Rational Design and Promising Environmental Applications

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Boosting visible-light-driven photocatalytic performance of waxberry-like CeO2 by samarium doping and silver QDs anchoring

Cited by 57 publications

References 45 publications

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

Polarization Engineering of Covalent Triazine Frameworks for Highly Efficient Photosynthesis of Hydrogen Peroxide from Molecular Oxygen and Water

Nitrogen and sulfur co-doped CeO2 nanorods for efficient photocatalytic VOCs degradation

Metal‐facilitated Photocatalytic Nanohybrids: Rational Design and Promising Environmental Applications

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Nitrogen and sulfur co-doped CeO₂ nanorods for efficient photocatalytic VOCs degradation