Br-doping mediated band-gap engineering contributed Bi/Bi2O2CO3 nano-platelets with enhanced photocatalytic performance

Wu, Chenyu; Zuo, Huiru; Zhao, Shengjie; Cheng, Yanan; Guo, Zhiyuan; Yan, Qishe

doi:10.1016/j.cej.2022.140157

Cited by 31 publications

(9 citation statements)

References 68 publications

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“…Ultraviolet‐visible spectrocsopy (UV–vis) were measured to uncover the light absorption property of CVO and W:CVO‐3 photoanodes. Figure a shows that the introduction of W 6+ results in a redshift of the optical absorption compared to pure CVO, which is caused by the reduction of the band gap due to the increase of the lattice spacing, [ 42 ] which is corroborated with XRD, Raman, and TEM. According to the Tauc plots, the band gap of W:CVO‐3 is reduced by about 0.22 eV compared to CVO.…”

Section: Resultsmentioning

confidence: 80%

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Huang,

Chen,

Hao

et al. 2023

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The sluggish four‐electron oxygen evolving reaction is one of the key limitations of photoelectrochemical water decomposition. Optimizing the binding of active sites to oxygen in water and promoting the conversion of *O to *OOH are the key to enhancing oxygen evolution reaction. In this work, W‐doped Cu2V2O7 (CVO) constructs corner‐sharing tetrahedrally coordinated W‐V dual active sites to induce the generation of electron deficiency active centers, promote the adsorption of ─OH, and accelerate the transformation of *O to *OOH for water splitting. The photocurrent obtained by the W‐modified CVO photoanode is 0.97 mA cm−2 at 1.23 V versus RHE, which is much superior to that of the reported CVO. Experimental and theoretical results show that the excellent catalytic performance may be attributed to the formation of synergistic dual active sites between W and V atoms, and the introduction of W ions reduces the charge migration distance and prolongs the lifetime of photogenerated carriers. Meanwhile, the electronic structure in the center of the d‐band is modulated, which leads to the redistribution of the electron density in CVO and lowers the energy barrier for the conversion of the rate‐limiting step *O to *OOH.

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Section: Resultsmentioning

confidence: 80%

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Huang,

Chen,

Hao

et al. 2023

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“…[22,23] But, recent studies showed that coupling (BiO) 2 CO 3 with other narrow-band semiconductors could promote notable visible-light photocatalytic performances. [24] For instance, Bi 2 O 3 was readily obtained and attached to Bi 2 O 2 CO 3 surface to afford Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunction, which improved the visible light absorption range and the photocatalytic performance compared to those of single and Bi 2 O 3 and Bi 2 O 2 CO 3 . [25,26] Additionally, note that the two semiconductor materials in the heterojunction shared a common element ensure the interface more tightly bound, meanwhile change the electronic structure of the interface, and hence further providing convenience for carrier transport and boosting the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, its practical applications are also severely limited [22,23] . But, recent studies showed that coupling (BiO) 2 CO 3 with other narrow‐band semiconductors could promote notable visible‐light photocatalytic performances [24] . For instance, Bi 2 O 3 was readily obtained and attached to Bi 2 O 2 CO 3 surface to afford Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunction, which improved the visible light absorption range and the photocatalytic performance compared to those of single and Bi 2 O 3 and Bi 2 O 2 CO 3 [25,26] .…”

Section: Introductionmentioning

confidence: 99%

Construction of Ternary Bismuth‐Based Heterojunction by Using (BiO)₂CO₃ as Electron Bridge for Highly Efficient Degradation of Phenol

Shen

Yang

Xue

et al. 2023

Chemistry A European J

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Inspired by nature, it has been considered an effective approach to design artificial photosynthetic system by fabricating Z-scheme photocatalysts to eliminate environmental issues and alleviate the global energy crisis. However, the development of low cost, environment-friendly, and highefficient photocatalysts by utilizing solar energy still confronts huge challenge. Herein, we constructed a Bi 2 O 3 /(BiO) 2 CO 3 / Bi 2 MoO 6 ternary heterojunction via a facile solvothermal method and calcination approach and used it as a photocatalyst for the degradation of phenol. The optimized Bi 2 O 3 / (BiO) 2 CO 3 /Bi 2 MoO 6 heterojunction delivers a considerable activity for phenol photodegradation with an impressive removal efficiency of 98.8 % and about total organic carbon (TOC) of 68 % within 180 min under visible-light irradiation. The excellent photocatalytic activity was ascribed to the formation of a Z-scheme heterojunction, more importantly, the presence of (BiO) 2 CO 3 as an electron bridge greatly shortens the migration distance of photogenerated electron from E CB of Bi 2 O 3 to E VB of Bi 2 MoO 6 , thus prolonging the lifetime of photogenerated electrons, which is verified by trapping experiments, electron spin-resonance spectroscopy (ESR) results, and density functional theory (DFT) calculations. This work provides a potential strategy to fabricate highly efficient Bi-based Z-scheme photocatalysts with wide application prospects in solar-to-fuel conversion and environmental protection.

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“…Additionally, BCO has the intergrowth of alternating [Bi 2 O 2 ] 2+ layer and CO 3 2− layers, which can easily form 2D nanosheet structures. [ 35–37 ] However, the dense nanosheet structures cannot provide sufficient active sites to facilitate the interaction between host and guest molecules. Therefore, it is of great significance to develop BCO‐based materials with permeable 3D structures combined with the heteroatom‐doping modulation strategy.…”

Section: Introductionmentioning

confidence: 99%

Chemiresistive Gas Sensors Based on Highly Permeable Sn‐Doped Bismuth Subcarbonate Microspheres: Facile Synthesis, Sensing Performance, and Mechanism Study

Huang,

Chen,

Xie

et al. 2023

Adv Funct Materials

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Acetic acid (CH3COOH) detection with high selectivity at low temperatures is significant due to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas sensors based on metal oxide semiconductors (MOSs) are widely used in detecting various gases, but it is necessary to develop MOSs with novel nanostructures to enhance gas‐sensing performance. Herein, a series of bismuth subcarbonate (Bi2O2CO3, abbreviated as BCO) microspheres with highly permeable lamellar structure and tunable Sn‐doping ratios (0–5 at%) is synthesized by controlling kinetics equilibrium of the hydrothermal reaction. The sensor based on 3 at% Sn‐doped BCO microspheres exhibits excellent gas‐sensing performances toward acetic acid (10 ppm), including high sensitivity (S = 8.3), fast recovery speed (10 s), long‐term stability (over 30 days), and good selectivity at a low temperature (150 °C). The unique permeable lamellar structure assembled from 2D Sn‐doped BCO nanosheets and rich Sn4+ doping‐induced active sites is mainly responsible for the enhanced gas‐sensing performances. Moreover, a new acetic acid reaction process is revealed via in situ diffuse reflectance infrared transform spectroscopy. Density functional theory calculations indicate that Sn‐doped BCO has a higher acetic acid adsorption energy and a larger charge transfer than pristine BCO.

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Br-doping mediated band-gap engineering contributed Bi/Bi2O2CO3 nano-platelets with enhanced photocatalytic performance

Cited by 31 publications

References 68 publications

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Construction of Ternary Bismuth‐Based Heterojunction by Using (BiO)₂CO₃ as Electron Bridge for Highly Efficient Degradation of Phenol

Chemiresistive Gas Sensors Based on Highly Permeable Sn‐Doped Bismuth Subcarbonate Microspheres: Facile Synthesis, Sensing Performance, and Mechanism Study

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Br-doping mediated band-gap engineering contributed Bi/Bi2O2CO3 nano-platelets with enhanced photocatalytic performance

Cited by 31 publications

References 68 publications

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu2V2O7 for Photoelectrochemical Water Oxidation

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu2V2O7 for Photoelectrochemical Water Oxidation

Construction of Ternary Bismuth‐Based Heterojunction by Using (BiO)2CO3 as Electron Bridge for Highly Efficient Degradation of Phenol

Chemiresistive Gas Sensors Based on Highly Permeable Sn‐Doped Bismuth Subcarbonate Microspheres: Facile Synthesis, Sensing Performance, and Mechanism Study

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Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Corner‐Sharing Tetrahedrally Coordinated W‐V Dual Active Sites on Cu₂V₂O₇ for Photoelectrochemical Water Oxidation

Construction of Ternary Bismuth‐Based Heterojunction by Using (BiO)₂CO₃ as Electron Bridge for Highly Efficient Degradation of Phenol