Synergetic effects of Bi5+ and oxygen vacancies in Bismuth(V)-rich Bi4O7 nanosheets for enhanced near-infrared light driven photocatalysis

Liu, Jin; Guo, Sheng; Wu, Hong-Zhang; Zhang, Xinlei; Li, Jun; Zhou, Kun

doi:10.1016/j.jmst.2021.01.022

Cited by 47 publications

(19 citation statements)

References 43 publications

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“… Compared with Bi 2 O 4 , the binding energy shift of Bi 3+ and Bi 5+ in Bi 2 O 4 -H-200 is not observed. In contrast to Bi 2 O 4 , however, Bi 3+ and Bi 5+ of Bi 2 O 4 -A-200 move slightly to a lower binding energy, possibly due to the state transition of Bi from Bi 5+ to Bi 3+ and an increase in the surface OV concentration that can capture more electrons . The atomic ratio of Bi 3+ /Bi 5+ is calculated to be 1.04 for Bi 2 O 4 , which is close to the theoretical value (1:1, Bi 3+ Bi 5+ O 4 ) .…”

Section: Resultssupporting

confidence: 63%

“…In contrast to Bi 2 O 4 , however, Bi 3+ and Bi 5+ of Bi 2 O 4 -A-200 move slightly to a lower binding energy, possibly due to the state transition of Bi from Bi 5+ to Bi 3+ and an increase in the surface OV concentration that can capture more electrons. 43 The atomic ratio of Bi 3+ /Bi 5+ is calculated to be 1.04 for Bi 2 O 4 , which is close to the theoretical value (1:1, Bi 3+ Bi 5+ O 4 ). 18 Nevertheless, the Bi 3+ /Bi 5+ atomic ratio of Bi 2 O 4 -H-200 and Bi 2 O 4 -A-200 increases to 1.11 and 1.28, respectively, indicating a very strong signal of enhanced surface OV concentration (Table 1).…”

Section: Crystal Phase and Morphologymentioning

confidence: 99%

See 1 more Smart Citation

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

et al. 2022

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The oxygen-deficient bismuth oxide, Bi 2 O 4 , synthesized by a typical hydrothermal method using commercial NaBiO 3 • 2H 2 O as a raw material only has a relatively low concentration of surface oxygen vacancies (OVs). How to improve the visible light photocatalytic performance of Bi 2 O 4 via tuning its surface OV concentration is still a huge challenge. In this study, improving the surface OVs of Bi 2 O 4 was successfully realized through the pretreatment of commercial NaBiO 3 •2H 2 O, including thermal treatment in air and hydrothermal treatment in 10 M NaOH solution, forming NaBiO 3 •xH 2 O intermediate products first, and then hydrothermal preparation of Bi 2 O 4 target products using NaBiO 3 •xH 2 O instead of commercial NaBiO 3 •2H 2 O as the precursor. The enhanced surface OV content not only narrows the band gap of Bi 2 O 4 and thus extends its optical response range but also captures more photoexcited electrons and thus increases the charge carriers' separation efficiency and prolongs the charge carriers' lifetime of Bi 2 O 4 . Among the above-mentioned two pretreatment methods, the effects of the hydrothermal pretreatment are superior to those of the thermal treatment, involving the increase of surface OVs, the optical harvesting capacity, and the charge carriers' separation efficiency. Accordingly, Bi 2 O 4 prepared by the hydrothermal pretreatment route exhibits the optimal visible light catalytic performance toward the removal of methyl orange (MO) and phenol due to its most abundant surface OV concentration, which is 2.59 times and 4.26 times higher than that of Bi 2 O 4 synthesized directly by the commercial NaBiO 3 •2H 2 O route, respectively. Holes (h + ) and superoxide radicals ( • O 2 − ) are identified as the main active species, while singlet oxygen ( 1 O 2 ) and hydroxyl radicals ( • OH) are verified as the second and third important active species for organic pollutant removal, respectively. This work has developed a novel strategy to promote the catalytic performance of single Bi 2 O 4 induced by the enhanced surface OV concentration through the pretreatment of the precursor, commercial NaBiO 3 • 2H 2 O.

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Section: Resultssupporting

confidence: 63%

Section: Crystal Phase and Morphologymentioning

confidence: 99%

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

et al. 2022

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“…After discussing hydrogen production with CNO 1– x via photocatalysis and thermocatalysis, we further analyzed the synergy of photo-thermo catalysis from the perspective of carriers under the dark/illuminated condition with a controlled temperature by means of Mott–Schottky , and Hall effect tests. − As shown in Figure , the carrier concentration at 63 °C under the dark condition was 3.47 × 10 21 cm –3 , and it was 2.04 × 10 21 cm –3 at 30 °C under irradiation. This is exactly the same as the trend of photocatalytic and thermocatalytic H 2 production rates given in Figure , while the carrier concentration was greatly improved to 10.3 × 10 21 cm –3 for photo-thermo catalysis.…”

mentioning

confidence: 99%

Synergetic Photo-Thermo Catalytic Hydrogen Production by Carbon Materials

Wang

Chen

Zhu

et al. 2022

J. Phys. Chem. Lett.

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Photo-thermo catalytic hydrogen production represents one of the most promising routes for channeling solar energy but typically suffers from high reaction temperatures. In this work, we develop photo-thermo catalytic hydrogen production at low temperatures by cost-effective, nonplasmonic, and metal-free nitrogen-doped carbon materials (CNO1–x ). We demonstrate that due to the photothermal conversion of CNO1–x , carrier generation is improved and electron migration is enhanced to suppress the recombination of electron–hole pairs, both of which promote hydrogen production by photocatalysis, while generated hydrogen radicals facilitate the regeneration of active sites for hydrogen production by thermocatalysis. Such synergy greatly promotes photo-thermo catalytic hydrogen production at low temperatures. These results demonstrate the great promise of photo-thermo catalytic hydrogen production over carbon materials at low temperatures.

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“…Liu et al prepared a novel NIR-active Bi 5+rich Bi 4 O 7 nanosheet with abundant OVs, exhibiting improved photocatalytic performance for the degradation of RhB and ciprofloxacin (CIP) compared to bulk Bi 2 O 3 . 149 The synergistic effect of OVs and Bi 5+ contributes to the generation of doped energy levels, which are beneficial to improve the optical absorption, narrow the band gap, and extend the carrier lifetime. Chen et al synthesized full spectrum-responsive vacancy-rich monolayer BiO 2-x for environment remediation.…”

Section: Whangbo Et Al Chose Narrow Band Gap Semiconductormentioning

confidence: 99%

“…Visible and near-infrared absorption spectra of TiO 2 nanobelts, Bi 2 WO 6 nanosheets, and Bi 2 WO 6 /TiO 2 nanobelt heterostructures confirm that Bi 2 WO 6 and Bi 2 WO 6 /TiO 2 strongly absorb energy in the UV–vis–NIR region (Figure d). Liu et al prepared a novel NIR-active Bi 5+ -rich Bi 4 O 7 nanosheet with abundant OVs, exhibiting improved photocatalytic performance for the degradation of RhB and ciprofloxacin (CIP) compared to bulk Bi 2 O 3 . The synergistic effect of OVs and Bi 5+ contributes to the generation of doped energy levels, which are beneficial to improve the optical absorption, narrow the band gap, and extend the carrier lifetime.…”

Section: Design Strategy Of Nir-active Photocatalysismentioning

confidence: 99%

Photocatalysis Driven by Near-Infrared Light: Materials Design and Engineering for Environmentally Friendly Photoreactions

Shen

et al. 2021

ACS EST Eng.

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Heterogeneous photocatalysis has captured worldwide attention because of its tremendous potential in the field of solar energy conversion to solve energy and environmental issues. Efficient utilization of solar energy is always the target of our pursuit in the areas of photocatalysis. The design of appropriate photocatalysts for wide-range light harvest from ultraviolet to near-infrared regions is a promising way to realize the practical utilization of photocatalysis. To date, the exploration of NIR light-responsive photocatalysis includes sensitization with near-infrared light (NIR) responsive materials such as dye molecules and black phosphorus, the surface plasmon resonance effect, upconversion, and narrow band gap materials as NIR harvesters. This review gives a comprehensive discussion and summary on the latest developments of the design and engineering of NIR-active photocatalysts and the related photocatalytic system for various environmentally friendly photoreactions including environmental remediation, water splitting, CO2 reduction, nitrogen fixation, and selective organic transformations. Finally, the future perspectives and challenges are present at the end in order to give a comprehensive understanding about the present near-infrared-driven photocatalysis and the promising directions for future investigations.

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Synergetic effects of Bi5+ and oxygen vacancies in Bismuth(V)-rich Bi4O7 nanosheets for enhanced near-infrared light driven photocatalysis

Cited by 47 publications

References 43 publications

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Synergetic Photo-Thermo Catalytic Hydrogen Production by Carbon Materials

Photocatalysis Driven by Near-Infrared Light: Materials Design and Engineering for Environmentally Friendly Photoreactions

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Synergetic effects of Bi5+ and oxygen vacancies in Bismuth(V)-rich Bi4O7 nanosheets for enhanced near-infrared light driven photocatalysis

Cited by 47 publications

References 43 publications

Improving the Surface Oxygen Vacancy Concentration of Bi2O4 through the Pretreatment of the NaBiO3·2H2O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi2O4 through the Pretreatment of the NaBiO3·2H2O Precursor as a High-Performance Visible Light Photocatalyst

Synergetic Photo-Thermo Catalytic Hydrogen Production by Carbon Materials

Photocatalysis Driven by Near-Infrared Light: Materials Design and Engineering for Environmentally Friendly Photoreactions

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Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst