SnS2-In2S3 p-n heterostructures with enhanced Cr6+ reduction under visible-light irradiation

Wang, Linjuan; Karuturi, Siva Krishna; Zan, Ling

doi:10.1016/j.apsusc.2020.148063

Cited by 26 publications

(12 citation statements)

References 70 publications

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“…In S3, the Sn 3d core-level spectra with angular momentum quantum number ( l = 2) undergo spin–orbit ( j–j ) splitting into doublets at binding energies (B.E.) of 495.3 eV (3d 3/2 ) and 486.9 eV (3d 5/2 ) with a peak area ratio of 3:2. , These doublets with a spin–orbit splitting energy of 8.5 eV correspond to the Sn 4+ state (Figure a). These doublets experience a slight downward shift in their B.E.…”

Section: Resultsmentioning

confidence: 99%

“…Once the carriers are populated over the nanosheet, the built-in electric field at the p–n junction readily drives the electrons and holes away from each other, thereby preventing their recombination . The interfacial carrier separation is better in S10 than in S3 due to a higher built-in potential ( V bi ) in the former. − Once separated, the photogenerated electrons are readily trapped in the V S sites. From the trapped sites, the electrons are transferred to the adsorbed O 2 molecule and generate O 2 · – radicals.…”

Section: Resultsmentioning

confidence: 99%

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Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Nath

Sarma

Chutia

et al. 2023

ACS Appl. Nano Mater.

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Defect engineering and hetero-interfacial bending are standard approaches for enhancing carrier separation and increasing visible light absorption in a semiconductor photocatalyst. Here, we demonstrate the evolution of sulfur vacancies (V S ) and the self-assembly of a p−n homojunction through prolonged aqueous washing of SnS 2 nanosheets. The experimental studies have validated increased hydrophilicity, layer thinning, V S generation, and extended photocarrier lifetime in washed SnS 2 nanosheets. Density functional theory has revealed the changes in the local electronic structure of SnS 2 in the presence of structural defects. An electrochemical impedance spectroscopy study has shown that V S actuates the self-assembly of a pseudo-p-type SnS layer over n-type SnS 2 to generate the p−n homojunction. The ptype carrier densities are increased twice as the number of washings is increased from 3 to 10 times. The photocatalytic efficacy of the SnS 2 homojunction is evaluated in the study of the degradation of several water contaminants under white light and monochromatic excitations. The proposed mechanism shows that the built-in electric field at the p−n junction promotes the separation of the photogenerated electrons and holes. Meanwhile, V S traps the electrons and transfers them to the catalytically reactive centers to participate in photocatalysis. Our findings demonstrate that a simple approach that involves prolonged aqueous washing of as-produced SnS 2 promotes the formation of V S and the self-assembly of a p−n homojunction in SnS 2 nanosheets with improved visible light photocatalytic performances.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Nath

Sarma

Chutia

et al. 2023

ACS Appl. Nano Mater.

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“…Photovoltaic power generation is the main form of using solar energy. Photogenerated carriers are produced inside photovoltaic materials upon light irradiation on their surface, which endows the photovoltaic materials with important potential applications in the fields of solar cells, photodetection, photocatalysis, and so on. − Traditional photovoltaic devices are usually obtained through the construction of a p–n junction, and a built-in electric field ( E b ) is formed at the junction. − The photogenerated electrons and holes are separated and form a photocurrent in those devices. However, the preparation of solar cells based on p–n junctions is complicated.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic Effect Induced by Self-Polarization in BiFeO₃ Films

Zhao

et al. 2021

J. Phys. Chem. C

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In this work, a significant visible-light photovoltaic effect is obtained under the influence of a built-in electric field in BiFeO 3 thin films. The photocurrent density, open-circuit voltage, and short-circuit current of the films are investigated systematically. For cells, the open-circuit voltage increases from 0.08 to 0.26 V after irradiation with light with a wavelength of 550 nm at a power density of 0.18 mW/nm. The photocurrent density at 550 nm reaches 1.8 × 10 −7 A/cm 2 , which is two orders higher compared to that of the dark state. The significant increase in these parameters is closely related to the separation and transport of photogenerated carriers driven by the built-in electric field. From the results, it is expected that this work can provide a method for improving the photoelectric performance of photovoltaic devices based on ferroelectric materials.

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“…[ 5–7 ] Photocatalytic Cr 6+ reduction has emerged as an attractive direction due to its potential to be environmental friendly, cheap, and sustainable. [ 1,8 ] Various photocatalysts have been reported for Cr 6+ reduction, including phlo‐@POF, [ 9 ] Cu 2 O/TiO 2 , [ 10 ] Zn(Ce, Mn)‐MOFs, [ 11 ] ZnWO 4 , [ 5 ] SnS 2 –In 2 S 3 , [ 12 ] and Gd(OH) 3 . [ 6 ] However, many of the reported materials show limited photocatalytic efficiency due to their wide bandgaps limiting their light absorption ability and/or inefficient redox ability due to fast recombination of photogenerated electron–hole pairs.…”

Section: Introductionmentioning

confidence: 99%

Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure

Wang

Karuturi

Zan

2021

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environment, which is defined as one of most toxic pollutants by the United States Environmental Protection Agency due to its high solubility. [1][2][3] With 100 times higher toxicity than Cr 3+ , Cr 6+ poses a great threat to the ecosystem, particularly from its biological recycling. [4] Thus the concentration of Cr 6+ in industrial wastewater needs to be strictly controlled before it can be safely discharged. Many methodsThe ORCID identification number(s) for the author(s) of this article can be found under

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SnS2-In2S3 p-n heterostructures with enhanced Cr6+ reduction under visible-light irradiation

Cited by 26 publications

References 70 publications

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Photovoltaic Effect Induced by Self-Polarization in BiFeO₃ Films

Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure

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SnS2-In2S3 p-n heterostructures with enhanced Cr6+ reduction under visible-light irradiation

Cited by 26 publications

References 70 publications

Self-Assembled p–n Homojunction in SnS2 Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Self-Assembled p–n Homojunction in SnS2 Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Photovoltaic Effect Induced by Self-Polarization in BiFeO3 Films

Bi2S3–In2S3 Heterostructures for Efficient Photoreduction of Highly Toxic Cr6+ Enabled by Facet‐Coupling and Z‐Scheme Structure

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Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Photovoltaic Effect Induced by Self-Polarization in BiFeO₃ Films

Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure