4.8 Review

S-scheme heterojunction photocatalysts for CO2 reduction

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Summary: An S-scheme heterojunction is constructed in a hybrid TiO2/In2S3 photocatalyst, which greatly promotes the separation of photogenerated carriers and enhances the production of H2O2. Computational methods and experiments are used to study the charge transfer and separation mechanisms within the S-scheme heterojunction.

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Summary: This article presents the superiority and design criteria of the emerging S-scheme heterojunction in photocatalysis. By overcoming the challenges faced by single photocatalysts through the construction of heterojunctions, the S-scheme heterojunction has demonstrated its potential in improving photocatalysis. The critical understanding of the curved Fermi level in the S-scheme heterojunction interface and the current challenges and prospects of S-scheme heterojunction photocatalysts are also discussed.

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Defective g-C3N4/covalent organic framework van der Waals heterojunction toward highly efficient S-scheme CO2 photoreduction

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In situ construction of S-scheme AgBr/BiOBr heterojunction with surface oxygen vacancy for boosting photocatalytic CO2 reduction with H2O

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Summary: In this study, an AgBr/BiOBr heterojunction with surface oxygen vacancies was synthesized using a simple chemical method, which showed significantly improved photoreduction rates of CO2 compared to pure BiOBr. The unique S-scheme band structure and oxygen vacancies were found to enhance the utilization of sunlight and increase the separation and transfer of photogenerated charge carriers, leading to efficient photocatalytic reduction of CO2.

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Photocatalytic CO2 reduction to HCOOH over core-shell Cu@Cu2O catalysts

Hui Wang et al.

Summary: In this study, uniform core-shell nanoparticles composed of a Cu core encapsulated by a Cu2O shell were fabricated by thermal treatment of a Cu-MOF precursor, showing catalytic activity in the conversion of CO2 to HCOOH. Mechanistic studies revealed that the Cu2O shell acted as the active sites for the adsorption and activation of CO2, contributing to the high HCOOH production rate achieved without any additives at room temperature.

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S-Scheme Heterojunction and Defect Site Engineering on CuxIn5S8-Cu2-ySe for Highly Efficient Photoreduction of CO2 to methanol

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Formation of hierarchical Bi2MoO6/ln2S3 S-scheme heterojunction with rich oxygen vacancies for boosting photocatalytic CO2 reduction

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Step-by-Step Mechanism Insights into the TiO2/Ce2S3 S-Scheme Photocatalyst for Enhanced Aniline Production with Water as a Proton Source

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EPR Investigation on Electron Transfer of 2D/3D g-C3N4/ZnO S-Scheme Heterojunction for Enhanced CO2 Photoreduction

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Electric Field Coupling in the S-Scheme CdS/BiOCl Heterojunction for Boosted Charge Transport toward Photocatalytic CO2 Reduction

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Construction of an Ultrathin S-Scheme Heterojunction Based on Few-Layer g-C3N4 and Monolayer Ti3C2Tx MXene for Photocatalytic CO2 Reduction

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Amine-Modified S-Scheme Porous g-C3N4/CdSe-Diethylenetriamine Composite with Enhanced Photocatalytic CO2 Reduction Activity

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ENVIRONMENTAL CHEMISTRY LETTERS (2021)

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Haizeng Song et al.

Summary: Black phosphorus has attracted attention for its advantageous characteristics, but its high chemical activity and rapid degradation under ambient conditions have limited its applications. Passivation techniques have helped alleviate these issues, allowing for excellent performance in various devices. Passivated black phosphorus not only shows good stability under ambient conditions, but also exhibits better performance compared to the original material, contributing to its potential applications.

NANO RESEARCH (2021)

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Yujie Bao et al.

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SOLAR RRL (2021)

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Surface Basicity of Metal@TiO2 to Enhance Photocatalytic Efficiency for CO2 Reduction

Lei Jin et al.

Summary: Photocatalytic reduction of CO2 to valuable chemical fuels is of broad interest due to its potential to activate greenhouse gases using renewable energy input. The choice of metal cocatalysts and surface basicity of TiO2 can enhance the photocatalytic efficiency for CO2 photoreduction, with different metals showing varying activity and selectivity for CO and hydrocarbon production. The improvement of electron density and low proton affinity of metal cocatalysts play a key role in CO2 photoreduction.

ACS APPLIED MATERIALS & INTERFACES (2021)

Article Chemistry, Physical

TiO2/polydopamine S-scheme heterojunction photocatalyst with enhanced CO2-reduction selectivity

Aiyun Meng et al.

Summary: This study fabricated polydopamine-modified TiO2 hollow spheres and investigated their effect on the photocatalytic CO2 reduction activities. The results showed that the PDA wrapping significantly enhanced the photocatalytic activity and methane selectivity, leading to improved yields.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

Article Chemistry, Physical

In situ self-assembled S-scheme BiOBr/pCN hybrid with enhanced photocatalytic activity for organic pollutant degradation and CO2 reduction

Tao zhang et al.

Summary: Researchers have developed a unique S-scheme heterostructure by immobilizing hollow hierarchical BiOBr microspheres onto protonated g-C3N4, resulting in enhanced photocatalytic activity for degradation of RhB and reduction of CO2. The introduction of pCN improved the adsorption capability and transformed RhB and CO2 molecules, while enhancing the separation of photogenerated charge carriers. The hybrid catalyst showed significantly improved activity under visible-light irradiation, with the 10% pCN/BiOBr hybrid demonstrating the best performance for RhB degradation and CO2 reduction.

APPLIED SURFACE SCIENCE (2021)

Article Engineering, Environmental

Recent advances on Bismuth-based Photocatalysts: Strategies and mechanisms

Li Zhang et al.

Summary: This review summarizes the methods and strategies for modifying Bi-based photocatalysts, including defect regulation, exposed facet control, etc. It focuses on the application and reaction mechanisms of BiOCl photocatalysts.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Chemistry, Multidisciplinary

In situ Irradiated XPS Investigation on S-Scheme TiO2@ZnIn2S4 Photocatalyst for Efficient Photocatalytic CO2 Reduction

Libo Wang et al.

Summary: Efficient hierarchical photocatalysts, such as the S-scheme core-shell TiO2@ZnIn2S4 heterojunction, have gained attention for photocatalytic CO2 reduction. The improved performance is attributed to the inhibited recombination of photogenerated charge carriers induced by the S-scheme heterojunction, as well as the large specific surface areas and abundant active sites. In situ irradiated X-ray photoelectron spectroscopy, work function calculation, and electron paramagnetic resonance measurements confirm the S-scheme photogenerated charge transfer mechanism.
Review Chemistry, Physical

A general review on the thiospinels and their energy applications

F. Ozel et al.

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MATERIALS TODAY ENERGY (2021)

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Recent advances in bismuth oxyhalide photocatalysts for degradation of organic pollutants in wastewater

Yang Li et al.

Summary: This review provides an overview of controllable synthesis, doping, surface modification, and heterojunction formation of BiOX-based photocatalysts, as well as future research trends. The main purpose is to provide practical guidelines for developing high-performance BiOX photocatalysts.

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DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

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Summary: In this study, the effect of S doping on S-scheme heterojunctions composed of BiOBr and g-C3N4 for CO2 reduction was thoroughly investigated using DFT calculations. The results showed that S doping can improve photocatalytic activity and enhance visible light absorption, leading to the preferential production of CH3OH over CH4. The study suggests that S doping is predicted to be an efficient photocatalyst for reducing CO2 into CH3OH.

FRONTIERS IN NANOTECHNOLOGY (2021)

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2D/2D Black Phosphorus/g-C3N4 S-Scheme Heterojunction Photocatalysts for CO2 Reduction Investigated using DFT Calculations

Xingang Fei et al.

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ACTA PHYSICO-CHIMICA SINICA (2021)

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Recent Advances in Surface-Modified g-C3N4-Based Photocatalysts for H2 Production and CO2 Reduction

Yunfeng Li et al.

Summary: Solar energy is the largest renewable energy source in the world, and photocatalysis technology plays an important role in solving water resource issues and reducing CO2 emissions. Surface modification of g-C3N4 photocatalysts can significantly improve their performance.

ACTA PHYSICO-CHIMICA SINICA (2021)

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Enhanced solar-to-chemical energy conversion of graphitic carbon nitride by two-dimensional cocatalysts

Chuanbiao Bie et al.

Summary: This paper introduces the current research status of g-C3N4 in photocatalysis strengthened by 2D cocatalysts, highlighting the advantages of 2D/2D heterojunctions and their application in STC energy conversion. The future development and challenges are also discussed.

ENERGYCHEM (2021)

Review Chemistry, Multidisciplinary

Recent advances in g-C3N4 composites within four types of heterojunctions for photocatalytic CO2 reduction

Meidan Que et al.

Summary: In recent years, studies on the photocatalytic conversion of CO2 into hydrocarbon fuels have been booming as a promising solution to alleviate global warming and energy issues. Researchers are focusing on developing g-C3N4 composite photocatalysts with excellent performance and stability. Different types of heterojunctions of g-C3N4 composites are widely adopted, aiming to understand the photocatalytic mechanisms and characteristics for future development.

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