Room temperature synthesis of BiOBr<sub>1−x</sub>I<sub>x</sub> thin films with tunable structure and conductivity type for enhanced photoelectric performance

Jia, Haiqiang; Li, Yuxing; Mao, Yuanyang; Yu, Dufei; He, Weiwei; Zheng, Zhi

doi:10.1039/d0ra08211b

Cited by 16 publications

(9 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12−14 The lattice oxygen atoms are present in Bi−O bonds in [Bi 2 O 2 ] 2+ slabs of BiOX layered structures. 14 The XPS results demonstrate the successful synthesis of xBr-BiOI solid solutions.…”

Section: Resultsmentioning

confidence: 79%

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Rana,

Alam,

Chaulagain

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Layered materials such as bismuth oxyhalides (especially BiOBr and BiOI) are the focus of research attention as photocatalysts due to their visible light activity, unique electronic structure, excellent chemical and physical stability, and internal electric field effect. We report the solvothermal synthesis of BiOX solid solutions with continuously tunable optical absorption and photoluminescence spectra. We employed solidstate nuclear magnetic resonance (SSNMR) characterization to probe the local environment around Bi atoms. We determined that the synthesized BiOX solid solutions exhibit good agreement with Vegard's law through refinement of the lattice parameters using powder X-ray diffraction (PXRD) and complementary atomic-level 209 Bi SSNMR spectroscopy. The solid solution strategy makes it possible to modulate the light absorption of BiOX and tune the redox potentials corresponding to the electronic band edges to drive chemical reactions. The BiOX solid solutions demonstrated superior performance in sunlight-driven photoelectrochemical and photocatalytic water splitting. The best performing solid solution generated a photocurrent density of 1.5 mA cm −2 and a H 2 evolution rate of 16.32 μmol g −1 h −1 for photoelectrochemical water splitting and photocatalytic hydrogen generation, respectively, and the enhanced performance is attributed to a higher specific surface area, a shorter carrier transit distance, and a higher electron density. The approximate order of magnitude performance improvement compared to pristine BiOBr and BiOI photoanodes was primarily due to optimal light harvesting combined with adequate thermodynamic driving force to drive water oxidation and proton reduction.

show abstract

Section: Resultsmentioning

confidence: 79%

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Rana,

Alam,

Chaulagain

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The direct band gaps (Eg) estimated by the UV–vis DRS spectra for BiOBr and BC6 were 2.76 and 2.63 eV, respectively (Figure S11c). Moreover, the positive slopes of Mott–Schottky curves in the linear regions indicate the n-type semiconductor feature for BiOBr and Ce-BiOBr. The conduction band (CB) potentials of BiOBr, BC4, and BC6 are estimated to be −0.79, −0.78, and −0.75 V vs SCE, which are equivalent to −0.57, −0.56, and −0.53 V vs NHE with a pH of 7, respectively.…”

Section: Resultsmentioning

confidence: 95%

Photocatalytic Reduction of CO₂ with H₂O Mediated by Ce-Tailored Bismuth Oxybromide Surface Frustrated Lewis Pairs

et al. 2022

View full text Add to dashboard Cite

Photocatalytic reduction of CO2 into available organic compounds has received remarkable attention. However, photocatalytic CO2 reduction is limited to meet industrial application requirements because of the lack of effective photocatalysts. Surface frustrated Lewis pairs (FLP) are found in bismuth oxybromide (BiOBr), which are effective catalytic sites to activate and photocatalytically reduce CO2. Furthermore, the introduction of Ce4+ and oxygen vacancy can optimize both the electronic state and the FLP property of BiOBr. The combined experimental and theoretical characterizations reveal that Ce4+ and O2– can form the frustrated Lewis acid–base pairs, which can catch, excite, and reduce CO2 into CO at a high yield of 50.9 μL h–1, being 9.8 times as large as pristine BiOBr. This work illustrates a rational strategy for both construction of highly efficient photocatalysts and insights into the photocatalytic mechanism at the atomic level.

show abstract

“…It has been widely used in environmental protection due to its unique layered structure and efficient photocatalysis. − In addition, Br – can easily escape from the interlayers owing to the weak van der Waals interaction and the presence of reduction potential; thus the corresponding extraction sites were generated to selectively reinsert Br – . Based on this remarkable electrochemical property, − our group extended the application of BiOBr to the selective extraction of Br – . For example, Wang et al prepared a BiOBr film on carbon paper by a three-step electrochemical method for Br – extraction by using a photoassisted ESIX technology .…”

Section: Introductionmentioning

confidence: 99%

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Gao

Zeng

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

An electroactive bismuth oxybromide/polyvinylidene difluoride/carbon black(BiOBr/PVDF/CB) composite film electrode was fabricated that had a bromide ion trap (Br–-trap) effect obtained by prereleasing of Br– under reduction potential. The Br–-trap BiOBr/PVDF/CB film electrode was used for the selective extraction of Br– from salt lake brine by electrochemically switched ion exchange (ESIX) technology. Moreover, an industrially scalable ESIX pilot system was designed and the effects of different process parameters were investigated. In the ESIX system, the obtained film electrode exhibited efficient adsorption quantity, and remarkable selectivity owing to its special ion trap effect. The extraction capacity of Br– reached 67.10 mg g–1 with the separation factors of 2.06 and 7.13 for Br–/Cl– and Br–/NO3 –, respectively, and the desorption efficiency of the film electrode remained at 95.4% after seven repeated cycles. It manifested that the pilot system with the Br–-trap BiOBr/PVDF/CB film electrode is expected to provide a novel direction for practical industrial Br– extraction.

show abstract

Room temperature synthesis of BiOBr_1−xI_x thin films with tunable structure and conductivity type for enhanced photoelectric performance

Abstract: The significantly improved photoelectric conversion performance of the BiOBr1−xI0.5x film is due to the more efficient photoinduced carrier separation and transfer, longer carrier lifetime and stronger absorption in the visible light region.

Cited by 16 publications

References 41 publications

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Photocatalytic Reduction of CO₂ with H₂O Mediated by Ce-Tailored Bismuth Oxybromide Surface Frustrated Lewis Pairs

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Contact Info

Product

Resources

About

Room temperature synthesis of BiOBr1−xIx thin films with tunable structure and conductivity type for enhanced photoelectric performance

Abstract: The significantly improved photoelectric conversion performance of the BiOBr1−xI0.5x film is due to the more efficient photoinduced carrier separation and transfer, longer carrier lifetime and stronger absorption in the visible light region.

Cited by 16 publications

References 41 publications

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Tunable Absorption and Emission in Mixed Halide Bismuth Oxyhalides for Photoelectrochemical Water Splitting

Photocatalytic Reduction of CO2 with H2O Mediated by Ce-Tailored Bismuth Oxybromide Surface Frustrated Lewis Pairs

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Contact Info

Product

Resources

About

Room temperature synthesis of BiOBr_1−xI_x thin films with tunable structure and conductivity type for enhanced photoelectric performance

Photocatalytic Reduction of CO₂ with H₂O Mediated by Ce-Tailored Bismuth Oxybromide Surface Frustrated Lewis Pairs