Aggregation-based phase transition tailored heterophase junctions of AgInS2 for boosting photocatalytic H2 evolution

Wu, Longyan; Hua, Xianhao; Liu, Yu; Zhang, Yuxin; Xue, Xiaogang; Deng, Honggao; Luo, Zhenggang; Zhang, Yuting

doi:10.1016/j.jcis.2022.08.114

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…With the decrease in pH, the absorption band edge of CIS QDs did not move significantly, but the absorption intensity increased. It is reported that the protonation of sulfide atoms on the surface of many metal sulfides will lead to sulfur vacancies ( V s ). , For I–III–VI QDs, energy levels below the conduction of Vs contribute to a sub-band. In addition, with the increase of H + , the diffusion or coalescence of the Vs interface can generate internal defects.…”

Section: Results and Discussionmentioning

confidence: 99%

Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Li,

Shao,

Ding

et al. 2023

ACS Appl. Nano Mater.

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Section: Results and Discussionmentioning

confidence: 99%

Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Li,

Shao,

Ding

et al. 2023

ACS Appl. Nano Mater.

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“…Hence, the VB positions of the materials were calculated to be 0.78 and 0.83 V for CIS and ZCIS-2, respectively, using eq . Furthermore, the VB potential of ZCIS-2 was also estimated through the VB-XPS technique, and the potential was found to be 0.88 eV, which is nearly equal to the VB potential calculated using eq . The VB-XPS plot is shown in Figure S12 of the Supporting Information. E normalg ( band gap ) = VB − CB …”

Section: Applicationsmentioning

confidence: 99%

“…Furthermore, the VB potential of ZCIS-2 was also estimated through the VB-XPS technique, and the potential was found to be 0.88 eV, which is nearly equal to the VB potential calculated using eq 5. 67 The VB-XPS plot is shown in Figure S12 of the Supporting Information.…”

mentioning

confidence: 99%

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

et al. 2022

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Photocatalytic H 2 O 2 production and recalcitrant pollutant degradation are regarded as promising clean technology toward achieving sustainable solar-to-chemical energy conversion. Herein, nonstoichiometric Zn-Cu-In-S (ZCIS) quaternary alloyed quantum dots (QDs) are rationally fabricated via a reflux method toward H 2 O 2 generation and ciprofloxacin degradation under visible light irradiation. The optimum catalyst (ZCIS-2) exhibits a notable H 2 O 2 production of 1685.2 μmole h −1 g −1 (solar-tochemical conversion efficiency (SCC), 0.19%), which is 5.3 times higher than that of CuInS 2 (CIS), and a ciprofloxacin (CIP) degradation efficiency of 96% in 2 h. The observed improvement in activity corresponds to optimized exciton separation/transfer, broad photon absorption, tunable band alignment, and effective adsorption/activation. In addition, oxygen reduction goes through both direct two-electron single-step reduction and single-electron two-step superoxide radical pathways, whereas CIP degradation proceeds via direct • O 2 − and indirect • OH radical pathways, as confirmed by scavenger experiments. An appropriate amount of defects improves the adsorption/activation of O 2 toward H 2 O 2 and active oxygen species generation that facilitates CIP degradation. The effect of operational parameters, such as pH, surrounding environment, presence of ions, sacrificial agent, etc., on both H 2 O 2 formation and CIP removal is vividly studied. Hence, the current study will provide an in-depth insight into O 2 photoreduction and micropollutant removal, which encourages further advancement of potent alloyed quantum dot-oriented photocatalytic systems.

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“…Semiconducting metal sulfides, especially I–III–VI polysulfides, have many advantages, such as strong visible light absorption, narrow band gap, excellent conductivity, chemical stability, and light corrosion resistance. , Indium sulfide (In 2 S 3 ) is an n-type semiconductor with a band gap energy of 2.0–2.3 eV, high photosensitivity, and low toxicity, and it has been studied in a heterostructure with other semiconductors, including GCN, in a few reports. − The photochemical properties of indium sulfide can be enhanced by the introduction of silver, obtaining I–III–VI sulfides with a range of stoichiometry, from doping levels to AgIn 5 S 8 and AgInS 2 . − Silver indium sulfides (AIS) possess a narrower band gap energy (∼1.7 eV), which allows for a higher sunlight capture ability, favoring promising results in the research of photocatalytic degradation and hydrogen production by water splitting. − Heterojunction composites containing AIS were successfully proposed, for example, between AgInS 2 nanosheets and TiO 2 , exhibiting an enhanced absorption of visible light and a promoted separation of photoinduced charge carrier pairs in the system, or zero-dimensional AgInS 2 QDs loaded on two-dimensional MXene nanosheets to construct a Z-type heterojunction with excellent interfacial charge transfer capability . After all, in view of the shortcomings of GCN, it is of practical significance to build a composite system of AIS QDs and GCN and optimize its optoelectronic properties by taking advantage of the unique properties of QDs.…”

Section: Introductionmentioning

confidence: 99%

Exploration of the g-C₃N₄ Heterostructure with Ag–In Sulfide Quantum Dots for Enhanced Photocatalytic Activity

Song

Zhang

et al. 2023

ACS Appl. Electron. Mater.

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Photocatalysis is an effective technology to convert solar energy into chemical energy, which has attracted great attention for the degradation of water pollutants and the hydrogen production by water splitting. The nonmetallic polymer g-C3N4 (GCN) can meet the thermodynamic conditions of photocatalytic water splitting, but its performances are not satisfying due to its narrow light absorption range and high recombination rate of photogenerated charge carriers. Among metal sulfide semiconductors, Ag–In sulfide quantum dots (AIS QDs), such as AgInS2, show excellent visible light absorption and promising photoactivity. In this work, AIS QDs-modified GCN is synthesized by an in situ growth method in mild conditions. The photocatalytic activity of the AIS-QDs/GCN nanocomposite is notably higher than that of the pure phase g-C3N4. Especially, the sample containing 10 wt % AIS QDs has the best activity in both tetracycline degradation and hydrogen generation, reaching 48.5% degradation efficiency in 1 h of visible light exposure (3.2 times that of GCN) and a hydrogen evolution rate of 62.3 μmol·g–1·h–1 (that of bare GCN being negligible). The optical and photoelectrochemical characterization highlights the interplay between the two components, suggesting that the enhanced photocatalytic activity of AIS-QDs/GCN is mainly due to the broadening of the light absorption range, the acceleration of charge transfer, and the reduction of the carrier pair recombination rate due to the formation of a type-II heterojunction inside the composite catalyst. This work is among the first attempts to modify g-C3N4 with polysulfide quantum dots to improve its catalytic performance, and the results provide an important step for advances in the application of these systems.

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Aggregation-based phase transition tailored heterophase junctions of AgInS2 for boosting photocatalytic H2 evolution

Cited by 9 publications

References 33 publications

Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

Exploration of the g-C₃N₄ Heterostructure with Ag–In Sulfide Quantum Dots for Enhanced Photocatalytic Activity

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Aggregation-based phase transition tailored heterophase junctions of AgInS2 for boosting photocatalytic H2 evolution

Cited by 9 publications

References 33 publications

Regulating Deep and Shallow Defects of CuInS2 Quantum Dots To Enhance Photocatalytic Hydrogen Production

Regulating Deep and Shallow Defects of CuInS2 Quantum Dots To Enhance Photocatalytic Hydrogen Production

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H2O2 Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

Exploration of the g-C3N4 Heterostructure with Ag–In Sulfide Quantum Dots for Enhanced Photocatalytic Activity

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Product

Resources

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Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Regulating Deep and Shallow Defects of CuInS₂ Quantum Dots To Enhance Photocatalytic Hydrogen Production

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

Exploration of the g-C₃N₄ Heterostructure with Ag–In Sulfide Quantum Dots for Enhanced Photocatalytic Activity