Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation

Cui, Dandan; Wang, Liang; Xu, Kang; Ren, Long; Yu, Youxing; Du, Yi; Hao, Weichang

doi:10.1039/c7ta09897a

Cited by 261 publications

(137 citation statements)

References 44 publications

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“…The Raman spectra for FSP-SnO 2 catalysts (Figure 4a) demonstrated peaks at wavenumber 474, 627, and 768 cm −1 that correspond to the E g , A 1g , and B 2g vibration modes, respectively. [39,41] Electron paramagnetic resonance was also utilized to semi-quantitatively determine the defects in the bulk of FSP-SnO 2 catalysts. [39,40] Additionally, a peak at ≈575 cm −1 assigned to surface defects present in SnO 2 was detected.…”

Section: Resultsmentioning

confidence: 99%

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

et al. 2019

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The large‐scale application of electrochemical reduction of CO2, as a viable strategy to mitigate the effects of anthropogenic climate change, is hindered by the lack of active and cost‐effective electrocatalysts that can be generated in bulk. To this end, SnO2 nanoparticles that are prepared using the industrially adopted flame spray pyrolysis (FSP) technique as active catalysts are reported for the conversion of CO2 to formate (HCOO−), exhibiting a FEHCOO− of 85% with a current density of −23.7 mA cm−2 at an applied potential of −1.1 V versus reversible hydrogen electrode. Through tuning of the flame synthesis conditions, the amount of oxygen hole center (OHC; SnO●) is synthetically manipulated, which plays a vital role in CO2 activation and thereby governing the high activity displayed by the FSP‐SnO2 catalysts for formate production. The controlled generation of defects through a simple, scalable fabrication technique presents an ideal approach for rationally designing active CO2 reduction reactions catalysts.

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Section: Resultsmentioning

confidence: 99%

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

et al. 2019

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“…All samples exhibited a similar ESR signal (g=1.97), corresponding to the paramagnetic O vacancies, as documented in previous references (e. g., BiVO 4 , BiOCl, CeO x , etc.) . From Figure d, the signal intensity of the alloys was stronger than that of monohalides, indicating that the concentration of O vacancies was higher, as proved by the XPS results.…”

Section: Resultsmentioning

confidence: 61%

“…All samples exhibited a similar ESR signal (g = 1.97), corresponding to the paramagnetic O vacancies, as documented in previous references (e. g., BiVO 4 , BiOCl, CeO x , etc.). [42][43][44] From Figure 5d, the signal intensity of the alloys was stronger than that of monohalides, indicating that the concentration of O vacancies was higher, as proved by the XPS results. Commonly, surface O vacancies serve as charge carrier traps as well as adsorption sites where the charge transfer to adsorbed species can prevent e-h recombination.…”

Section: Mechanism Of the Alloying Effects On Improving The Photocatamentioning

confidence: 90%

A Mechanism Investigation of how the Alloying Effect Improves the Photocatalytic Nitrate Reduction Activity of Bismuth Oxyhalide Nanosheets

et al. 2019

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Alloyed bismuth oxyhalides have been widely used in photocatalytic water treatment processes due to their superior photocatalytic activity. However, there is no report on the removal of NO3− for alloyed bismuth oxyhalides, and the mechanism of the effect of alloying on NO3− reduction activity is still unclear. In this work, we prepared a series of BiOClnBr1‐n (0≤n≤1) with different Cl/Br ratios but with controlled similar morphologies, and explored their catalytic activities on reducing NO3− under visible light irradiation. Density functional theory investigations revealed that the formation energy for an oxygen (O) vacancy on the surface of BiOClnBr1‐n alloys is clearly reduced in comparison with the monohalide, illustrating that more O vacancies can be produced on the surface of BiOClnBr1‐n alloys. A high concentration of O vacancies not only promotes the adsorption of NO3− but also enhances the separation efficiency of the photogenerated electron‐hole (e–h) pairs, with both being beneficial to enhance the photocatalytic activity of BiOClnBr1‐n alloys for NO3− reduction. These new discoveries not only promote the design and development of new photocatalysts with excellent NO3− reduction properties, but also help to understand the relationship between alloying effects and semiconductor photocatalytic properties.

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“…Up to now, too many measures have been applied. For example, plasma import, quantum dots introduction, metal/nonmetal doping, heterojunction construction, and surface oxygen vacancies …”

Section: Introductionmentioning

confidence: 99%

“…For example, plasma import, 16,19 quantum dots introduction, 17,20 metal/nonmetal doping, 21,22 heterojunction construction, 18,23 and surface oxygen vacancies. 24,25 As we all know, the family of VIII metal (Fe, Co, Ni) oxides or hydroxides are extensively utilized as cocatalysts for water redox reaction considering their superior properties. [26][27][28] Akaganeite (β-FeOOH), as a semiconductor material, exhibits a stable crystal structure and a large specific surface area.…”

Section: Introductionmentioning

confidence: 99%

A BiOCl/β-FeOOH heterojunction for HER photocatalytic performance under visible-light illumination

Wang

et al. 2019

Int J Energy Res

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Summary β‐iron oxide hydroxide (β‐FeOOH) had been proven to be an effective co‐catalyst during H2 evolution reaction (HER) process. In this research, a BiOCl/β‐FeOOH heterojunction was successfully synthesized by a solid‐state doping method. Then, the structure, composition, and photo‐electrochemical properties of the prepared photocatalysts were studied. For the superior HER photocatalytic activity of ultrasmall β‐FeOOH nanoparticles (NPs) and the formation of the BiOCl/β‐FeOOH heterojunction, this heterojunction photocatalyst exhibited very superior photocatalytic performance in the HER process. Especially, when the amount of incorporated β‐FeOOH NPs was appropriate, the BFOH‐2 possessed the highest photocatalytic activity in HER process, and the HER rate was about 16.64 mmol·g−1·h−1 during illuminated time of 6 hours under visible light. When appropriate, ultrasmall β‐FeOOH NPs were implanted into the structure of BiOCl, the BiOCl/β‐FeOOH heterojunction interfaces would form for the existence of interfacial interactions. Therefore, this BiOCl/β‐FeOOH heterojunction exhibited superior visible‐light response, fast photo‐carrier migration, and high‐efficient separation of photo‐carriers, so that the BFOH‐2 heterojunction possessed high‐efficient hydrogen evolution reaction (HER) photocatalytic activity.

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Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation

Abstract: Engineering the electronic structure of BiOCl through the creation of oxygen vacancies can be a good strategy to enhance the photooxidation activity of BiOCl.

Cited by 261 publications

References 44 publications

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

A Mechanism Investigation of how the Alloying Effect Improves the Photocatalytic Nitrate Reduction Activity of Bismuth Oxyhalide Nanosheets

A BiOCl/β-FeOOH heterojunction for HER photocatalytic performance under visible-light illumination

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Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation

Abstract: Engineering the electronic structure of BiOCl through the creation of oxygen vacancies can be a good strategy to enhance the photooxidation activity of BiOCl.

Cited by 261 publications

References 44 publications

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO2 Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO2 Reduction

A Mechanism Investigation of how the Alloying Effect Improves the Photocatalytic Nitrate Reduction Activity of Bismuth Oxyhalide Nanosheets

A BiOCl/β-FeOOH heterojunction for HER photocatalytic performance under visible-light illumination

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Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction

Modulating Activity through Defect Engineering of Tin Oxides for Electrochemical CO₂ Reduction