CsPbBr<sub>3</sub>–CdS heterostructure: stabilizing perovskite nanocrystals for photocatalysis

Kipkorir, Anthony; DuBose, Jeffrey T.; Cho, Junsang; Kamat, Prashant V.

doi:10.1039/d1sc04305f

Cited by 69 publications

(78 citation statements)

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“…with free electron exchange and holes migrating toward the MHP), whereby the deposition of a CdS shell could shield the MHP component within a toluene/ethanol mixed solvent, thereby resulting in an improved stability and photocatalytic performance compared with only pristine CsPbBr 3 . [50] A similar stability enhancement in polar solvents was observed by Zhang and co-workers, who found that the Janus CsPbBr 3 /ZrO 2 type II heterojunctions exhibit significant stability enhancement compared with pristine CsPbBr 3 after polar solvent treatment, which is due to the partial coverage of ZrO 2 over CsPbBr 3 . [51] In recent years, various MHP-based type II heterojunctions have been prepared and used in a wide range of chemical reactions, including water splitting, CO 2 reduction reaction, organic transformation, and environmental remediation (Table S2).…”

Section: Mhp-based Type II Heterojunction Photocatalystssupporting

confidence: 73%

“…Additionally, Kamat and co‐workers reported a quasi‐type II CsPbBr 3 ‐CdS core–shell heterojunction (i.e. with free electron exchange and holes migrating toward the MHP), whereby the deposition of a CdS shell could shield the MHP component within a toluene/ethanol mixed solvent, thereby resulting in an improved stability and photocatalytic performance compared with only pristine CsPbBr 3 [50] . A similar stability enhancement in polar solvents was observed by Zhang and co‐workers, who found that the Janus CsPbBr 3 /ZrO 2 type II heterojunctions exhibit significant stability enhancement compared with pristine CsPbBr 3 after polar solvent treatment, which is due to the partial coverage of ZrO 2 over CsPbBr 3 [51] …”

Section: Impact Of Heterojunction Formation On Mhp‐based Photocatalystsmentioning

confidence: 99%

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Metal Halide Perovskite Based Heterojunction Photocatalysts

et al. 2022

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With fascinating photophysical properties and a strong potential to utilize solar energy, metal halide perovskites (MHPs) have become a prominent feature within photocatalysis research. However, the effectiveness of single MHP photocatalysts is relatively poor. The introduction of a second component to form a heterojunction represents a well‐established route to accelerate carrier migration and boost reaction rates, thus increasing the photoactivity. Recently, there have been several scientific advances related to the design of MHP‐based heterojunction photocatalysts, including Schottky, type II, and Z‐scheme heterojunctions. In this Review, we systematically discuss and critically appraise recent developments in MHP‐based heterojunction photocatalysis. In addition, the techniques for identifying the type of active heterojunctions are evaluated and we conclude by briefly outlining the ongoing challenges and future directions for promising photocatalysts based on MHP heterojunctions.

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Section: Mhp-based Type II Heterojunction Photocatalystssupporting

confidence: 73%

Section: Impact Of Heterojunction Formation On Mhp‐based Photocatalystsmentioning

confidence: 99%

Metal Halide Perovskite Based Heterojunction Photocatalysts

et al. 2022

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“…The photocatalytic degradation of AAF by TCN ( Figure 5 ) was always higher than by commercial TiO 2 (P25) and pure TiO 2 prepared, which might be attributed to the formation of the TiO 2 /g-C 3 N 4 heterojunction [ 29 , 44 , 45 , 46 , 47 ]. The TCN samples with a 20 doping ratio, 10 °C·min −1 , 550 °C, 6 h in the same three other conditions showed the optimum photocatalytic degradation efficiency.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

Zhu

Chen²,

Wang

et al. 2022

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Different TiO2/g-C3N4 (TCN) composites were synthesized by a simple pyrolysis method with TiO2 xerogel and urea. The structure and physicochemical properties of TCN were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, ultraviolet-visible diffuse reflectance spectrum, X-ray photoelectron spectroscopy, N2-adsorption isotherms and electrochemical impedance spectroscopy. Aniline Aerofloat was chosen as a typical degradation-resistant contaminant to investigate the photodegradation activity of TCN under UV irradiation. The results indicated that TCN had higher light absorption intensity, larger specific surface area and smaller particle size compared to pure TiO2. Furthermore, TCN had great recycling photocatalytic stability for the photodegradation of Aniline Aerofloat. The photocatalytic activity depends on the synergistic reaction between holes (h+) and hydroxyl radicals (·OH). Meanwhile, the direct Z-scheme heterojunction structure of TiO2 and g-C3N4 postpones the recombination of h+ and electrons to enhance UV-light photocatalytic activity.

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“…Lastly, regarding the applications of PNCs in polar environments, which was the main topic of this review, Kamat and co‐workers [ 109 ] have studied the effect of the deposition of CdS nanoparticles decorating CsPbBr 3 PNCs, to increase their stability in polar solvents. The authors claim that optical properties and stability of the nanocrystals are associated to the passivation of surface defects, which also act as a coverage avoiding the direct interaction with polar species.…”

Section: Charge Transfer Kinetics In Pncsmentioning

confidence: 99%

Application of Halide Perovskite Nanocrystals in Solar‐Driven Photo(electro)Catalysis

et al. 2022

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Global warming and ecosystems contamination by fine chemicals industry have motivated to explore and develop cleaner and lower cost strategies for the energy conversion and transformation of organic compounds. [1,2] Solar-driven catalysis via photo(electro)catalysis (PEC) has emerged as a promising route to store sunlight into chemical bonds. Commonly, PEC water splitting has been studied as an approach to reduce H þ to produce green hydrogen with the oxygen evolution reaction (OER) as electron donor. As this reaction is kinetically very demanding, water can be substituted by organic compounds as electron donors due to their faster oxidation kinetics. This would increase the H 2 evolution kinetics while concomitantly producing high added-value chemicals, remediating industrial wastewaters, [3][4][5][6][7][8] and making use of semiconductor materials with highly oxidizing/ reducing power. [8,9] In a simple manner, when a semiconductor is illuminated with an energy equal or higher than its bandgap, charge carrier photogeneration and separation is promoted. Photogenerated holes are formed in the valence band (VB), where oxidation reactions take place, while electrons with higher free energy are located in the conduction band (CB) to trigger reduction reactions. [9][10][11] This is the basis of photocatalytic (PC) reactions led through nanoparticle system (Figure 1A). Then, when the photomaterial is deposited in a conducting substrate, PEC oxidation and reduction reactions can be carried out in separate compartments. [9,12,13] Here, one type of photocarriers migrate to the photoelectrode surface to conduct an interfacial PEC semireaction, while the other kind of photocarrier is transported through the external circuit to a counter electrode and perform the complementary PEC semireaction (Figure 1B). [9] Metal oxides, chalcogenides, and heterojunctions based on these materials have attracted significant attention as photocatalysts due to their wide gamut of low-cost synthetic protocols available for their preparation and facile charge carrier extraction [9,10,[13][14][15][16] Although metal oxide photoelectrodes show a high performance under UV light, high stability, and low toxicity in some cases, they are often limited by their poor light harvesting efficiency toward near-infrared wavelengths. Additionally, metal oxide photoelectrodes tend to exhibit a fast carrier recombination as well as poor charge accumulation/transport kinetics, hindering their applicability in solar water splitting applications. [10,17,18] In the case of chalcogenides, their superior optoelectronic properties are in contrast with the low stability promoted by their fast photodegradation. To reduce photodegradation and charge carrier recombination and to overcome charge transport/accumulation kinetic limitations, inner-sphere redox couples and organic substrates are commonly used to accelerate

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CsPbBr₃–CdS heterostructure: stabilizing perovskite nanocrystals for photocatalysis

Abstract: The instability of cesium lead bromide (CsPbBr3) nanocrystals (NCs) in polar solvents has hampered their use in photocatalysis. We have now succeeded in synthesizing CsPbBr3-CdS heterostructures with improved stability and...

Cited by 69 publications

References 65 publications

Metal Halide Perovskite Based Heterojunction Photocatalysts

Metal Halide Perovskite Based Heterojunction Photocatalysts

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

Application of Halide Perovskite Nanocrystals in Solar‐Driven Photo(electro)Catalysis

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CsPbBr3–CdS heterostructure: stabilizing perovskite nanocrystals for photocatalysis

Abstract: The instability of cesium lead bromide (CsPbBr3) nanocrystals (NCs) in polar solvents has hampered their use in photocatalysis. We have now succeeded in synthesizing CsPbBr3-CdS heterostructures with improved stability and...

Cited by 69 publications

References 65 publications

Metal Halide Perovskite Based Heterojunction Photocatalysts

Metal Halide Perovskite Based Heterojunction Photocatalysts

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

Application of Halide Perovskite Nanocrystals in Solar‐Driven Photo(electro)Catalysis

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CsPbBr₃–CdS heterostructure: stabilizing perovskite nanocrystals for photocatalysis