Orienting the charge transfer path of type-II heterojunction for photocatalytic hydrogen evolution

Cai, Hairui; Wang, Bin; Xiong, Laifei; Bi, Jinglei; Yuan, Longyun; Yang, Guidong; Yang, Shengchun

doi:10.1016/j.apcatb.2019.117853

Cited by 77 publications

(22 citation statements)

References 58 publications

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“…Given the formed II‐type heterojunction at the interface, the electrons in CB of CdZnS can rapidly move to the CB of In 2 O 3 , while the holes transfer from the VB of In 2 O 3 to the VB of CdZnS. [ 68–71 ] Subsequently, the photogenerated electrons concentrated in the CB of In 2 O 3 would react with H + in the water to produce H 2 , and the holes concentrated in the VB of CdZnS would be captured by sacrificial reagent. Accordingly, the combination of In 2 O 3 and CdZnS could effectively accelerate the transportation of photoexcited electrons and holes in space, and thus more electrons can take part in the photocatalytic H 2 productions process.…”

Section: Resultsmentioning

confidence: 99%

MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

Yang

Tang

Luo

et al. 2021

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The development of efficient visible‐light‐driven photocatalysts is one of the critically important issues for solar hydrogen production. Herein, high‐efficiency visible‐light‐driven In2O3/CdZnS hybrid photocatalysts are explored by a facile oil‐bath method, in which ultrafine CdZnS nanoparticles are anchored on NH2‐MIL‐68‐derived fusiform In2O3 mesoporous nanorods. It is disclosed that the as‐prepared In2O3/CdZnS hybrid photocatalysts exhibit enhanced visible‐light harvesting, improves charges transfer and separation as well as abundant active sites. Correspondingly, their visible‐light‐driven H2 production rate is significantly enhanced for more than 185 times to that of pristine In2O3 nanorods, and superior to most of In2O3‐based photocatalysts ever reported, representing their promising applications in advanced photocatalysts.

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Section: Resultsmentioning

confidence: 99%

MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

Yang

Tang

Luo

et al. 2021

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“…The size of the arc radius on the EIS Nyquist diagram can reflect the separation and mobility of electrons on the electrode surface. Studies have shown that the smaller the radius of the arc, the smaller the resistance of the interface charge transfer. − Figure c shows the EIS spectra of the three samples. Among them, the radius of the arc of the 20% CuMOF/CdS composite sample is significantly smaller than that of CdS, which indicates that the 20% CuMOF/CdS composite sample receives less resistance during the carrier-transfer process.…”

Section: Resultsmentioning

confidence: 99%

Tactfully Assembled CuMOF/CdS S-Scheme Heterojunction for High-Performance Photocatalytic H₂ Evolution under Visible Light

Quan

Wang

Jin

2021

ACS Appl. Energy Mater.

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Constructing an S-scheme heterojunction is considered to be an effective strategy to improve the photocatalytic activity of a one-component photocatalyst. In this work, the CuMOF/CdS composite photocatalyst was synthesized by the electrostatic self-assembly strategy. The 20% CuMOF/CdS composite photocatalyst exhibits a high hydrogen evolution performance (40.17 μmol/h) under visible light, and its hydrogen production rate is 3.34 times that of pure CdS (12.02 μmol/h). Through a series of analysis of the catalyst structure, chemical composition, and photoelectrochemical properties, it is concluded that the high-efficiency hydrogen evolution is mainly due to the combined effect of the high specific surface area and the S-scheme heterostructure. The formation of the S-scheme heterojunction between the contact interface of CdS and CuMOF hinders the recombination of electrons and holes and increases the effective charge separation and transfer rate. This work not only provides an effective method for improving the hydrogen evolution activity of CdS but also broadens the application of CuMOF.

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“…[120,121] According to the previously reported works, type-II heterojunction is regarded as the most promising architecture to improve the carrier separation performance in the semiconductor system. [122] As the conduction and valence band positions of semiconductor B are both higher than those of semiconductor A (Figure 7b), [123,124] the thermodynamic driving force brought by the heterojunction built-in electric field will make the photogenerated electrons from the conduction band of semiconductor B spontaneously transport to the conduction band of semiconductor A, and photogenerated holes from the valence band of semiconductor A will on the contrary transport to the valence band of semiconductor B, thus resulting in the enhanced carrier separation process. [125,126] Type-III heterojunction is similar to type-II heterojunction, but the band structure will be further offset (Figure 7c).…”

Section: Heterojunction Engineeringmentioning

confidence: 99%

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

et al. 2021

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In practical applications, solar energy is usually converted to other forms of energy, such as electric energy, [9][10][11] chemical energy, [12,13] thermal energy, [14,15] so as to facilitate further transportation and storage. Among them, photoelectrochemical (PEC) reactions from water to hydrogen, CO 2 to C2+ products, and N 2 to NH 3 in the aqueous-based environment have been considered to be quite promising solar-chemical energy conversion pathways. [16][17][18][19] Unlike the traditional water electrolyzing system, the most ideal PEC reaction system can be selfdriven by illumination without external bias. Utilizing the electron-hole carriers generated from the semiconductor photoelectrode, redox reactions take place separately on the photocathode and photoanode. However, as the water oxidation reaction involves a complex four-proton coupled multi-electron process (2H 2 O + 4h + → O 2 + 4H + , E o = 1.23 V vs reversible hydrogen electrode (RHE)), it makes the water oxidation reaction the rate-control step in the watersplitting reaction. [20] Therefore, developing high-performance photo anodes is of great fundamental importance and interest.At the present stage, TiO 2 is the most studied and applied semiconductor photoelectrocatalyst, due to its outstanding chemical stability. [21][22][23] However, as a wide bandgap semiconductor (anatase TiO 2 : 3.2eV, rutile TiO 2 : 3.0 eV), TiO 2 can only respond to the ultraviolet light. Meanwhile, as an intrinsic semiconductor, the bulk/surficial carrier recombination of TiO 2 greatly hinders its practical application. [24][25][26][27] In that case, some narrow bandgap semiconductors are also applied as the photoanode materials, such as Ta 3 N 5 (bandgap 2.1 eV), [28,29] BiVO 4 (bandgap 2.4 eV), and α-Fe 2 O 3 (bandgap 2.1 eV). [30][31][32] However, many of these narrow bandgap materials suffer from poor chemical stability and sluggish interfacial charge injection. [33][34][35] As intrinsic semiconductor materials, both wide and narrow bandgap semiconductor photoanode materials are suffering from the poor bulk-phase carrier separation, intense surficial e − /h + trapping recombination, and sluggish electrode/electrolyte carrier injection kinetics. [36][37][38][39] Fortunately, with the continuous investment of researchers, a series of modification methods have been established and the PEC water oxidation performance of semiconductor photoanode materials has been significantly improved. [32,[40][41][42][43][44] Among various strategies, nanostructure-interface engineering is widely regarded as an effective method to improve the PEC water oxidation performance: [40,41] the light-harvesting performance can be enhanced by the widened optical Photoelectrochemical (PEC) water oxidation based on semiconductor materials plays an important role in the production of clean fuel and value-added chemicals. Nanostructure-interface engineering has proven to be an effective way to construct highly efficient PEC water oxidation photoanodes with good light capture, carrier transport, and ...

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Orienting the charge transfer path of type-II heterojunction for photocatalytic hydrogen evolution

Cited by 77 publications

References 58 publications

MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

Tactfully Assembled CuMOF/CdS S-Scheme Heterojunction for High-Performance Photocatalytic H₂ Evolution under Visible Light

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

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Orienting the charge transfer path of type-II heterojunction for photocatalytic hydrogen evolution

Cited by 77 publications

References 58 publications

MOFs‐Derived Fusiform In2O3 Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

MOFs‐Derived Fusiform In2O3 Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

Tactfully Assembled CuMOF/CdS S-Scheme Heterojunction for High-Performance Photocatalytic H2 Evolution under Visible Light

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

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MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

MOFs‐Derived Fusiform In₂O₃ Mesoporous Nanorods Anchored with Ultrafine CdZnS Nanoparticles for Boosting Visible‐Light Photocatalytic Hydrogen Evolution

Tactfully Assembled CuMOF/CdS S-Scheme Heterojunction for High-Performance Photocatalytic H₂ Evolution under Visible Light