Efficient utilization of photogenerated electrons and holes for photocatalytic redox reactions using visible light-driven Au/ZnIn2S4 hybrid

A series of Bi2Sn2O7 photocatalysts was developed with the aim to regulate defect chemistry as well as electronic structure by modulating the charge states of tin species for boosting photocatalytic selective oxidation of alcohols performance. Defective centers, such as oxygen vacancies (OVs), were beneficial to enhancing the adsorption and activation of molecular oxygen. Meanwhile, the valence band edge potential of Bi2Sn2O7 with higher OVs content exhibited a distinct downshift, improving the thermodynamical driving force of photooxidation. Additionally, OVs contributed to promoting the separation efficiency of photogenerated carriers, which can be confirmed by the surface photovoltage measurement. By optimizing the electronic structure as well as defect chemistry, the optimal benzyl alcohol conversion efficiency was 76.0 % with selectivity toward benzaldehyde being about 100 %. It's found that photogenerated holes and .O2− active species played critical role in photocatalytic aerobic oxidation. This work may provide a novel insight to clarify the role of defect chemistry during the selective benzyl alcohol oxidation over Bi2Sn2O7 photocatalyst.

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“…Then the carbocations react with . O 2 − species to produce the final product, corresponding to benzaldehyde …”

Section: Resultsmentioning

confidence: 99%

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi₂Sn₂O₇: Exceptional Catalytic Activity and Selectivity

Huang

Kou

et al. 2019

ChemCatChem

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“…[132][133][134] Zhu et al synthesized Au/ZIS photocatalysts by the solvothermal and in situ photodeposition methods for the selective oxidation of benzyl alcohol to benzaldehyde (BAD) and hydrogen production. [134] The Au decoration on the host semiconductor ZIS can greatly improve the absorption of visible light. The results showed that the ZIS modified with Au obviously improved the photocatalytic performance compared with pure ZIS, and the optimal Au loading of ZIS is 0.5%.…”

Section: Improving the Absorbance Of Zis In Visible Light Regionmentioning

confidence: 99%

A Review and Recent Developments in Full‐Spectrum Photocatalysis using ZnIn₂S₄‐Based Photocatalysts

et al. 2021

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Nowadays, photocatalytic technology is considered as one of the most efficient methods to solve the problem of the global energy shortage and the pollution of the environment. Among these outstanding photocatalysts, metal sulfide‐based semiconductors have attracted wide attention because of their good chemical stability, simple synthesis method, and relatively narrow bandgaps. ZnIn2S4 (ZIS), as a layered structure ternary metal chalcogenide and a rising material star, has made exciting breakthroughs in the past decades. Recently, studies have shown that a rich variety of ZIS composite nanostructures are developed. This review summarizes the recent advances and development in the design and improvement of ZIS and ZIS‐based photocatalysts in full‐spectrum photocatalytic applications. Furthermore, the applications of ZIS‐based photocatalysts are discussed, such as in photocatalytic hydrogen production, CO2 reduction, degradation of pollutants, and photocatalytic selective organic transformations under ultraviolett (UV), visible (Vis), and near‐infrared (NIR) light irradiation. In the end, a brief summary and perspectives on the challenges and future directions in the area of ZIS and ZIS‐based photocatalysts are also provided.

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“…Time-resolved photoluminescence (TRPL) decay spectra are performed to investigate the migration process of photo-induced charge carriers in Figure 5D. Compared with pristine CdS (τ A = 3.25 ns), MoP 4 /CdS has a relatively longer average lifetime (τ A = 4.50 ns), mainly deriving from the presence of MoP 4 nanoparticles trapping photo-generated electrons to delay the recombination of electron-hole pairs [44,45] ( Supporting information Table S1). In addition, the linear sweep voltammogram (LSV) curves of pristine CdS, MoO 3 /CdS and MoP 4 /CdS were measured in a 0.5 M Na 2 SO 4 aqueous solution at a scan rate of 100 mV s À 1 under visible light irradiation (λ > 420 nm) (Supporting Information Figure S8).…”

Section: Photocatalytic Activities Of Mop 4 /Cds Photocatalystsmentioning

confidence: 99%

MoP₄ Nanoparticles as a Novel and Efficient Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution

Liu

Jiang

et al. 2019

ChemCatChem

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In this work, MoP 4 nanoparticles were in situ loaded onto CdS nanorods (CdS NRs) via vapor-solid phase synthesis and the composite of MoP 4 /CdS proved to be active for photocatalytic hydrogen evolution under visible-light irradiation, in which MoP 4 nanoparticles can work as a novel and efficient cocatalyst. MoP 4 /CdS can achieve a much higher hydrogen evolution rate of 494.5 μmol h À 1 than that of the pristine CdS NRs (22.6 times), and even higher than of the noble metal Pt (2.0 %) loaded on CdS NRs, indicating that MoP 4 nanoparticles can replace noble metals as a potential cocatalyst with ultra-high catalytic activity.Based on the structural and photoelectrical characterization results, the catalytic mechanism of MoP 4 /CdS was proposed. The enhanced photocatalytic activity of MoP 4 /CdS is attributed to the promoted charge separation, low hydrogen evolution over-potential, a long average lifetime for photogenerated carriers and enhanced abilities to inhibit electron-hole pair recombination. In the field, this work provides guidance for the design and preparation of novel and efficient cocatalyst of phosphide.

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Efficient utilization of photogenerated electrons and holes for photocatalytic redox reactions using visible light-driven Au/ZnIn2S4 hybrid

Cited by 108 publications

References 55 publications

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi₂Sn₂O₇: Exceptional Catalytic Activity and Selectivity

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi₂Sn₂O₇: Exceptional Catalytic Activity and Selectivity

A Review and Recent Developments in Full‐Spectrum Photocatalysis using ZnIn₂S₄‐Based Photocatalysts

MoP₄ Nanoparticles as a Novel and Efficient Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution

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Efficient utilization of photogenerated electrons and holes for photocatalytic redox reactions using visible light-driven Au/ZnIn2S4 hybrid

Cited by 108 publications

References 55 publications

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi2Sn2O7: Exceptional Catalytic Activity and Selectivity

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi2Sn2O7: Exceptional Catalytic Activity and Selectivity

A Review and Recent Developments in Full‐Spectrum Photocatalysis using ZnIn2S4‐Based Photocatalysts

MoP4 Nanoparticles as a Novel and Efficient Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution

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Product

Resources

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Oxygen‐Vacancy‐Mediated Photocatalysis over Bi₂Sn₂O₇: Exceptional Catalytic Activity and Selectivity

Oxygen‐Vacancy‐Mediated Photocatalysis over Bi₂Sn₂O₇: Exceptional Catalytic Activity and Selectivity

A Review and Recent Developments in Full‐Spectrum Photocatalysis using ZnIn₂S₄‐Based Photocatalysts

MoP₄ Nanoparticles as a Novel and Efficient Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution