Charge transfer dynamics in C3N4 encapsulated Cs3Bi2Br9 nanocrystals heterojunction for photocatalytic application

Xu, Wei-Long; Hu, Jingli; Yang, Qiyan; Lian, Yuebin; Zheng, Min; Du, Erwei

doi:10.1016/j.jallcom.2024.174275

Cited by 3 publications

(2 citation statements)

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“…It is clearly shown that the halide perovskite performed a high efficiency of photodegradation with 93% and 80% photodegradation efficiency for pure Cs 3 Bi 2 I 9 [71] and Cs 3 Bi 2 Br 9 [45], respectively. The 99% and 98% photodegradation efficiency was shown by Cs 3 Bi 2 Br 9 /TiO 2 [28] and C 3 N 4 /Cs 3 Bi 2 Br 9 [29], respectively. This study reported that the construction of halide perovskite heterostructure had improved the band alignment and charge carrier migration of CBB, improving the photocatalytic performance.…”

Section: Evaluation Of Photocatalytic Activity-bnoh Oxidationmentioning

confidence: 96%

“…Qimeng Sun et al reported in 2021 that the heterojunction Cs 3 Bi 2 Br 9 /TiO 2 shows an enhanced photocatalytic efficiency of benzyl alcohol oxidation [28]. Wei-Long et al reported in 2024 that the composite of C 3 N 4 /Cs 3 Bi 2 Br 9 significantly improved the photocatalytic degradation efficiency of RhB by 98% at 1 h [29]. Despite the development of halide perovskite heterostructure, the low charge carrier migration and photocatalytic performance are still of continuous concern.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Awang,

Hezam,

Peppel

et al. 2024

Nanomaterials

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Halide perovskite Cs3Bi2Br9 (CBB) has excellent potential in photocatalysis due to its promising light-harvesting properties. However, its photocatalytic performance might be limited due to the unfavorable charge carrier migration and water-induced properties, which limit the stability and photocatalytic performance. Therefore, we address this constraint in this work by synthesizing a stable halide perovskite heterojunction by introducing hydrogen titanate nanosheets (H2Ti3O7-NS, HTiO-NS). Optimizing the weight % (wt%) of CBB enables synthesizing the optimal CBB/HTiO-NS, CBHTNS heterostructure. The detailed morphology and structure characterization proved that the cubic shape of CBB is anchored on the HTiO-NS surface. The 30 wt% CBB/HTiO-NS-30 (CBHTNS-30) heterojunction showed the highest BnOH photooxidation performance with 98% conversion and 75% benzoic acid (BzA) selectivity at 2 h under blue light irradiation. Detailed optical and photoelectrochemical characterization showed that the incorporating CBB and HTiO-NS widened the range of the visible-light response and improved the ability to separate the photo-induced charge carriers. The presence of HTiO-NS has increased the oxidative properties, possibly by charge separation in the heterojunction, which facilitated the generation of superoxide and hydroxyl radicals. A possible reaction pathway for the photocatalytic oxidation of BnOH to BzH and BzA was also suggested. Furthermore, through scavenger experiments, we found that the photogenerated h+, e− and •O2− play an essential role in the BnOH photooxidation, while the •OH have a minor effect on the reaction. This work may provide a strategy for using HTiO-NS-based photocatalyst to enhance the charge carrier migration and photocatalytic performance of CBB.

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Section: Evaluation Of Photocatalytic Activity-bnoh Oxidationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Awang,

Hezam,

Peppel

et al. 2024

Nanomaterials

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Compositionally Tunable Magneto-optical Properties of Lead-Free Halide Perovskite Nanocrystals

Feng,

Yeh,

Radovanovic

2024

J. Phys. Chem. Lett.

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Nanoparticles of Cs₃Bi₂Br₉ Decorated on H₂Ti₃O₇ Nanotubes for the Photocatalytic Oxidation of Hydroxymethylfurfural to 2,5-Furandicarboxaldehyde

Awang,

Hezam,

Ding

et al. 2024

ACS Appl. Nano Mater.

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Herein, the successful construction of heterostructure Cs 3 Bi 2 Br 9 /H 2 Ti 3 O 7 (CBB/HTiO-NT) consisting of nanoparticles of lead-free halide perovskite Cs 3 Bi 2 Br 9 (CBB) on hydrogen titanate nanotubes (H 2 Ti 3 O 7 , HTiO-NT) is reported. The application of this heterostructure was intensively investigated in the photocatalytically induced selective oxidation of hydroxymethylfurfural (HMF) to 2,5-furandicarboxaldehyde (FDC) and of benzyl alcohol (BnOH) to benzoic acid (BzA). The weight % (wt %) of CBB nanoparticles was optimized, and the resulting optimal CBB/HTiO-NT heterostructure was deeply analyzed. Comprehensive analysis of the morphology and structure demonstrated the successful combination of HTiO-NT and CBB in CBB/HTiO-NT heterostructures. If the CBB content is too low, it is not stable, potentially because it decomposes at the interface with HTiO-NT. The 30 wt % CBB/HTiO-NT heterojunction exhibited the most efficient photooxidation of HMF and BnOH, with selectivity of 87% for FDC and 81% for BzA, respectively, in an organic solution irradiated by blue light. Analysis of optical and photoelectrochemical properties revealed that the inclusion of CBB nanoparticles into HTiO-NT led to enhanced mobility of charge carriers and improved photocatalytic efficiency. The oxidative characteristics and rate of charge carrier migration in the CBB/HTiO-NT heterostructure were enhanced by the geometry and tubular structure of HTiO-NT, thereby promoting the formation of superoxide (•O 2 − ) radicals. Furthermore, scavenger experiments have demonstrated the essential role of the photogenerated species, specifically h + , e − , and •O 2 − , in the process of HMF photooxidation. Consequently, a plausible chemical pathway for the photocatalytic oxidation of HMF to FDC was presented. However, additional improvement of the stability of the composite material is necessary. The present study offers a potential approach to improve photocatalytic conversions to value-added chemicals by utilizing CBB/HTiO-NT-based photocatalysts.

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Charge transfer dynamics in C3N4 encapsulated Cs3Bi2Br9 nanocrystals heterojunction for photocatalytic application

Cited by 3 publications

References 31 publications

Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Compositionally Tunable Magneto-optical Properties of Lead-Free Halide Perovskite Nanocrystals

Nanoparticles of Cs₃Bi₂Br₉ Decorated on H₂Ti₃O₇ Nanotubes for the Photocatalytic Oxidation of Hydroxymethylfurfural to 2,5-Furandicarboxaldehyde

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Charge transfer dynamics in C3N4 encapsulated Cs3Bi2Br9 nanocrystals heterojunction for photocatalytic application

Cited by 3 publications

References 31 publications

Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Enhancing the Photocatalytic Activity of Halide Perovskite Cesium Bismuth Bromide/Hydrogen Titanate Heterostructures for Benzyl Alcohol Oxidation

Compositionally Tunable Magneto-optical Properties of Lead-Free Halide Perovskite Nanocrystals

Nanoparticles of Cs3Bi2Br9 Decorated on H2Ti3O7 Nanotubes for the Photocatalytic Oxidation of Hydroxymethylfurfural to 2,5-Furandicarboxaldehyde

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Nanoparticles of Cs₃Bi₂Br₉ Decorated on H₂Ti₃O₇ Nanotubes for the Photocatalytic Oxidation of Hydroxymethylfurfural to 2,5-Furandicarboxaldehyde