Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co3O4‐Modified BiOBr/AgBr S‐Scheme Heterojunction

Lei, Wanying; Fu, Junwei; Jin, Huile; Xu, Quanlong; Wang, Shun

doi:10.1002/solr.202200279

Cited by 17 publications

(8 citation statements)

References 63 publications

(95 reference statements)

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“…Under light irradiation, new adsorption bands of *COOH (1258 and 1507 cm –1 ), *COO (carboxyl, 900 and 1017 cm –1 ), *C=O (carbonyl, 1839 cm –1 ), and *CO (absorbed CO, 1956 cm –1 ) are detected, which are key intermediates in the conversion of CO 2 to CO. In light of these observations, the pathway for CO 2 photoreduction over In 2 O 3 /Nb 2 O 5 hybrid nanofibers is proposed as follows, where * denotes the reaction active site 23 , 60 , 61 : …”

Section: Resultsmentioning

confidence: 99%

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Deng,

Zhang,

et al. 2024

Nat Commun

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Constructing S-scheme heterojunctions proves proficient in achieving the spatial separation of potent photogenerated charge carriers for their participation in photoreactions. Nonetheless, the restricted contact areas between two phases within S-scheme heterostructures lead to inefficient interfacial charge transport, resulting in low photocatalytic efficiency from a kinetic perspective. Here, In2O3/Nb2O5 S-scheme heterojunctions are fabricated through a straightforward one-step electrospinning technique, enabling intimate contact between the two phases and thereby fostering ultrafast interfacial electron transfer (<10 ps), as analyzed via femtosecond transient absorption spectroscopy. As a result, powerful photo-electrons and holes accumulate in the Nb2O5 conduction band and In2O3 valence band, respectively, exhibiting extended long lifetimes and facilitating their involvement in subsequent photoreactions. Combined with the efficient chemisorption and activation of stable CO2 on the Nb2O5, the resulting In2O3/Nb2O5 hybrid nanofibers demonstrate improved photocatalytic performance for CO2 conversion.

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Section: Resultsmentioning

confidence: 99%

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Deng,

Zhang,

et al. 2024

Nat Commun

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“…Among the photocatalysts, [Bi 2 O 2 ] 2+ layer-containing Bibased composites, such as BiOCl, BiOBr, BiOI, Bi 2 WO 6 , Bi 2 MoO 6 , and so forth, have been proven to be underlying noble-metal free catalysts for solar-driven energy conversion. [24][25][26][27][28][29][30][31][32] [Bi 2 O 2 ] 2+ layer-containing Aurivillius-related oxide usually has a powerful internal electric field, which promotes separation of electron-hole pairs for bulk charge separation tuning. Bi 2 O 2 SiO 3 (BOSO) is a shiny Aurivillius-related layered metal oxide, with [Bi 2 O 2 ] 2+ layers and interleaved [SiO 3 ] 2slices.…”

Section: Introductionmentioning

confidence: 99%

Atomic‐level insight of sulfidation‐engineered Aurivillius‐related Bi₂O₂SiO₃ nanosheets enabling visible light low‐concentration CO₂ conversion

Wang

et al. 2022

Carbon Energy

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Unraveling atomic-level active sites of layered photocatalyst towards lowconcentration CO 2 conversion is still challenging. Herein, the yield and selectivity of photocatalytic CO 2 reduction of the Aurivillius-related oxide semiconductor Bi 2 O 2 SiO 3 nanosheet (BOSO) were largely improved using a surface sulfidation strategy. The experiment and theoretical calculation confirmed that surface sulfidation of the Bi 2 O 2 SiO 3 nanosheet (S-BOSO, 6.28 nm) redistributed the charge-enriched Bi sites, extended the solar spectrum absorption to the whole visible range, and considerably enhanced the charge separation, in addition to creating new reaction active sites, as compared to pristine BOSO. Subsequently, surface sulfidation played a switchable role, wherein S-BOSO showed a very high CH 3 OH generation rate (12.78 µmol g −1 for 4 h, 78.6% selectivity) from low-concentration CO 2 (1000 ppm) under visible light irradiation, which outperforms most of the state-of-the-art photocatalysts under similar conditions. This study presents an atomic-level modification protocol for engineering reactive sites and charge behaviors to promote solar-to-energy conversion.

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“…Therefore, in order to improve the utilization of sunlight, researchers have developed many other semiconductors that can respond to visible and even infrared light [13][14][15] . Among them, BiOBr has been widely studied because of its suitable band gap (2.6-2.9 eV) 16 , abundant raw material source and good stability, and is widely used in the fields of CO2 reduction 17,18 , water splitting to produce H2 [19][20][21][22] , degradation of organic pollutants [23][24][25][26][27] , Cr(VI) reduction [28][29][30][31] and H2O2 generation [32][33][34] . However, pure BiOBr tends to exhibit relatively poor photocatalytic activity due to its rapid carrier recombination.…”

Section: Introductionmentioning

confidence: 99%

0D/2D Carbon Nitride Quantum Dots (CNQDs)/BiOBr S-Scheme Heterojunction for Robust Photocatalytic Degradation and H2O2 Production

Zan¹,

Li²,

Gao³

et al. 2022

Acta Physico Chimica Sinica

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The construction of heterojunctions is a method employed to inhibit the rapid recombination of photogenerated carriers. In this work, zero-dimensional (0D) g-C3N4 quantum dots (CNQDs) were composited with two-dimensional (2D) BiOBr for the first time using the typical hydrothermal method under the conditions of a high temperature and high pressure, and a 0D/2D CNQD/BiOBr S-scheme heterojunction with an intimate-contact interface was formed. The π-electrons in the heterocycle of the CNQDs were bound to BiOBr by interaction. The apparent reaction rate constants generated by CNQDs/BiOB-1.50% for tetracycline (TC) and ciprofloxacin (CIP) degradation and H2O2 production were 2.02, 2.91, and 1.54 times that of the original BiOBr, respectively. In the cycle test, CNQDs/BiOBr-1.50% displayed a relatively high photocatalytic activity and structural stability. X-ray photoelectron spectroscopy (XPS) analysis showed that the π electrons in the CNQDs interacted with BiOBr, and also confirmed the flow of photogenerated electrons in this heterojunction. This successfully constructed S-scheme exhibited extraordinary photocatalytic activity and stability. The more active species and stable catalytic activity were attributed to the distinctive transfer mechanism of the carriers. This work will provide reference for constructing 0D/2D S-scheme heterojunctions for the degradation of organic pollutants and in situ production of H2O2.

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Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co₃O₄‐Modified BiOBr/AgBr S‐Scheme Heterojunction

Cited by 17 publications

References 63 publications

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Atomic‐level insight of sulfidation‐engineered Aurivillius‐related Bi₂O₂SiO₃ nanosheets enabling visible light low‐concentration CO₂ conversion

0D/2D Carbon Nitride Quantum Dots (CNQDs)/BiOBr S-Scheme Heterojunction for Robust Photocatalytic Degradation and H<sub>2</sub>O<sub>2</sub> Production

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Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co3O4‐Modified BiOBr/AgBr S‐Scheme Heterojunction

Cited by 17 publications

References 63 publications

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Ultrafast electron transfer at the In2O3/Nb2O5 S-scheme interface for CO2 photoreduction

Atomic‐level insight of sulfidation‐engineered Aurivillius‐related Bi2O2SiO3 nanosheets enabling visible light low‐concentration CO2 conversion

0D/2D Carbon Nitride Quantum Dots (CNQDs)/BiOBr S-Scheme Heterojunction for Robust Photocatalytic Degradation and H<sub>2</sub>O<sub>2</sub> Production

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Product

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Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co₃O₄‐Modified BiOBr/AgBr S‐Scheme Heterojunction

Atomic‐level insight of sulfidation‐engineered Aurivillius‐related Bi₂O₂SiO₃ nanosheets enabling visible light low‐concentration CO₂ conversion