2020
DOI: 10.3390/nano10040763
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Pb-Free Cs3Bi2I9 Perovskite as a Visible-Light-Active Photocatalyst for Organic Pollutant Degradation

Abstract: In our work, we employed Cs3Bi2I9 as a visible-light-active photocatalyst, synthesized with a low-temperature solvothermal method. The morphological and structural properties of the as-prepared perovskite were investigated, and the results were compared to previous studies to confirm its nature and the quality of the synthesis procedure. Transient absorption spectroscopy was applied in order to investigate the generation and lifetime of photogenerated charge carriers, revealing their formation after visible li… Show more

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Cited by 60 publications
(36 citation statements)
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“…As mentioned in the Introduction section, Cs 3 Bi 2 I 9 and Cs 3 Bi 2 Br 9 have attracted significant recent interest due to their relevant photoactivity, which, however, to date has been determined only on particualte samples. 18 , 19 …”
Section: Resultsmentioning
confidence: 99%
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“…As mentioned in the Introduction section, Cs 3 Bi 2 I 9 and Cs 3 Bi 2 Br 9 have attracted significant recent interest due to their relevant photoactivity, which, however, to date has been determined only on particualte samples. 18 , 19 …”
Section: Resultsmentioning
confidence: 99%
“…17 The same compound has been used in photocatalysis for hydrogen evolution and organic pollutant degradation. 18 , 19 …”
Section: Introductionmentioning
confidence: 99%
“…M‐Ti showed a CO 2 uptake of 3.4 cm 3 g −1 , proving that the mesoporous structure endowed it with CO 2 enrichment ability (Figure S39). Combined with the above interior surface charge‐transfer mechanism, Bi is considered to be the active site for CO 2 photoreduction because the conduction band minima of CBB and CABB are contributed by Bi 6p orbitals (Figures 5a, b) [16] . Moreover, the CO 2 adsorption energies (Eads) of various active sites on CBB and CABB surfaces indicate that Bi has the highest adsorption energy (0.936 eV and 0.771 eV, respectively), favoring adsorption after accumulation in the mesopores (Figures 5c, S40, and S41).…”
Section: Resultsmentioning
confidence: 99%
“…Halide perovskites have been intensively studied in solar cells, light‐emitting diodes, photodetectors, and lasers owing to their high extinction coefficients, optimal band gaps, low exciton binding energy, and excellent charge transport properties [10–13] . These photoelectronic properties have prompted their use in photocatalytic applications, such as hydrogen evolution, dye degradation, and organic synthesis [14–20] . In particular, Bi‐based all‐inorganic perovskites (Cs 3 Bi 2 X 9 and Cs 2 AgBiX 6 ) appear to be more suitable than Pb‐based perovskites for energy and environmental photocatalysis because Bi has lower toxicity than Pb [21, 22] .…”
Section: Introductionmentioning
confidence: 99%
“…Scientific breakthroughs with MHPs in 2013 were focused on the potential use of MHPs as promising light-harvesters, along with their beneficial electronic properties, such as a long photogenerated diffusion and lifetime, which can be compared to the traditional semiconductors [142,145,146]. Studies on photophysical processes, such as transient absorption spectroscopy, have recently confirmed the effectiveness of charge carrier dynamics in monitoring the photogenerated carriers, in terms of photon absorption, vibrational relaxation and exciton generation and separation [147][148][149]. The advantageous properties include balanced long electro-hole diffusion lengths that surpassed those of typically used photovoltaic materials [145], high charge carrier mobility and lifetime [150], and beneficial interfacial charge transfer dynamics, as well as still-uncovered electron injection dynamics [151].…”
Section: Long-range Balanced and Ambipolar Charge Carrier Transport Propertiesmentioning
confidence: 99%