Zn Cd1–S quantum dot with enhanced photocatalytic H2-production performance

Gao, Rongrong; Cheng, Bei; Fan, Jiajie; Ho, Wingkei

doi:10.1016/s1872-2067(20)63614-2

Cited by 97 publications

(44 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, ternary sulfide solid solutions have been drawn extensive attention 22 , owing to their tunable electronic structure and superior light absorption 7,23 . ZnxCd1−xS [24][25][26][27] , MnxCd1−xS 7,28 and ZnIn2S4 29 have been synthesized for photocatalytic HER. Among these solid solutions, MnxCd1−xS solid solution has been seen as one of promising semiconductor photocatalysts for producing H2 from water under visible light 30 .…”

Section: Introductionmentioning

confidence: 99%

Constructing 1D/2D Schottky-Based Heterojunctions between Mn0.2Cd0.8S Nanorods and Ti3C2 Nanosheets for Boosted Photocatalytic H2 Evolution

姜志民¹,

陈晴²,

郑巧清³

et al. 2020

Acta Physico Chimica Sinica

View full text Add to dashboard Cite

Sustainable photocatalytic H2 evolution has attracted extensive attention in recent years because it can address both energy shortage and environmental pollution issues. In particular, metal sulfide solid-solution photocatalysts have been widely applied in photocatalytic hydrogen generation owing to their excellent light harvesting properties, narrow enough band gap, and suitable redox potentials of conduction and valance bands. However, it is still challenging to develop low-cost and high-efficiency sulfide solid-solution photocatalysts for practical photocatalytic hydrogen evolution. Recently, 1D MnxCd1−xS nanostructures have shown superior light absorption, charge separation, and H2-evolution activity owing to their shortened diffusion pathway of carriers and high length-to-diameter ratios. Thus, 1D MnxCd1−xS nanostructures have been applied in photocatalytic H2 evolution. However, a single MnxCd1−xS photocatalyst still has some disadvantages for photocatalytic H2 evolution, such as the rapid recombination of photogenerated electron-hole pairs and low quantum efficiency. Herein, to further boost the separation of photogenerated charge carriers and H2-evolution kinetics, an in situ solvothermal method was used to synthesize the 1D/2D Schottkybased heterojunctions between the Mn0.2Cd0.8S nanorods (MCS NRs) and Ti3C2 MXene nanosheets (NSs). Furthermore, various characterization methods have been used to investigate the crucial roles and underlying mechanisms of metallic Ti3C2 MXene NSs in boosting the photocatalytic H2 evolution over the Mn0.2Cd0.8S nanorods. X-ray Diffraction (XRD), Transmission Electron Microscope (TEM), High Resolution Transmission Electron Microscopy (HRTEM), element mapping images, and X-ray Photoelectron Spectroscopy (XPS) results clearly demonstrate that hybrid low-cost Schottky-based heterojunctions have been successfully constructed for practical applications in photocatalytic H2 evolution. Additionally, the photocatalytic hydrogen evolution reaction (HER) was also carried out in a mixed solution of Na2SO3 and Na2S using as the sacrificial agents. The highest hydrogen evolution rate of the optimized 1D/2D Schottky-based heterojunction is 15.73 mmol•g −1 •h −1 , which is 6.72 times higher than that of pure MCS NRs (2.34 mmol•g −1 •h −1 ). An apparent quantum efficiency of 19.6% was achieved at 420 nm. The stability measurements of the binary photocatalysts confirmed their excellent photocatalytic stability for practical applications. More interestingly, the UV-Vis diffuse reflection spectra, photoluminescence (PL) spectrum, transient photocurrent responses, and Electrochemical Impedance Spectroscopy (EIS) Nyquist plots clearly confirmed the promoted charge separation between the MCS NRs and Ti3C2 MXene NSs. The linear sweep voltammetry also showed that the loading of MXene cocatalysts could greatly decrease the overpotential of pure MCS NRs, suggesting that the 2D Ti3C2 NSs could act as an electronic conductive bridge to improve the H2-evolution kinetics. In summary, these results show th...

show abstract

Section: Introductionmentioning

confidence: 99%

Constructing 1D/2D Schottky-Based Heterojunctions between Mn0.2Cd0.8S Nanorods and Ti3C2 Nanosheets for Boosted Photocatalytic H2 Evolution

姜志民¹,

陈晴²,

郑巧清³

et al. 2020

Acta Physico Chimica Sinica

View full text Add to dashboard Cite

show abstract

“…Hydrogen is an ideal source of clean energy. [ 184–186 ] It has a higher combustion enthalpy than any forms of fossil energy. Moreover, its combustion product (H 2 O) is a resource on which humans live.…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

Design, Fabrication, and Mechanism of Nitrogen‐Doped Graphene‐Based Photocatalyst

et al. 2021

Self Cite

View full text Add to dashboard Cite

Solving energy and environmental problems through solar‐driven photocatalysis is an attractive and challenging topic. Hence, various types of photocatalysts have been developed successively to address the demands of photocatalysis. Graphene‐based materials have elicited considerable attention since the discovery of graphene. As a derivative of graphene, nitrogen‐doped graphene (NG) particularly stands out. Nitrogen atoms can break the undifferentiated structure of graphene and open the bandgap while endowing graphene with an uneven electron density distribution. Therefore, NG retains nearly all the advantages of original graphene and is equipped with several novel properties, ensuring infinite possibilities for NG‐based photocatalysis. This review introduces the atomic and band structures of NG, summarizes in situ and ex situ synthesis methods, highlights the mechanism and advantages of NG in photocatalysis, and outlines its applications in different photocatalysis directions (primarily hydrogen production, CO2 reduction, pollutant degradation, and as photoactive ingredient). Lastly, the central challenges and possible improvements of NG‐based photocatalysis in the future are presented. This study is expected to learn from the past and achieve progress toward the future for NG‐based photocatalysis.

show abstract

“…As a cocatalyst, QDs can promote the separation of photogenerated electronhole pairs and catalyze surface reactions. [89] Zheng et al modified TiO 2 with sulfur-and nitrogencodoped graphene QDs (designated as SN-GQD/TiO 2 ) to improve photocatalytic H 2 O 2 production, showing a H 2 O 2 yield 3.2-fold higher than TiO 2 . [90] The graphene QDs extended the optic absorption range of TiO 2 into the visible-light region, and S-and N-doping in the QDs enhanced charge transfer and separation.…”

Section: Quantum Dots Modificationmentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

Small

Self Cite

236

127

View full text Add to dashboard Cite

Hydrogen peroxide (H 2 O 2 ) is a mild but versatile oxidizing agent with extensive applications in bleaching, wastewater purification, medical treatment, and chemical synthesis. The state-of-art H 2 O 2 production via anthraquinone oxidation is hardly considered a cost-efficient and environment-friendly process because it requires high energy input and generates hazardous organic wastes. Photocatalytic H 2 O 2 production is a green, sustainable, and inexpensive process which only needs water and gaseous dioxygen as the raw materials and sunlight as the power source. Inorganic metal oxide semiconductors are good candidates for photocatalytic H 2 O 2 production due to their abundance in nature, biocompatibility, exceptional stability, and low cost. Progress has been made to enhance the photocatalytic activity toward H 2 O 2 production, however, H 2 O 2 photosynthesis is still in the laboratory research phase since the productivity is far from satisfaction. To inspire innovative ideas for boosting the H 2 O 2 yield in photocatalysis, the most well-studied metal oxide photocatalysts are selected and the modification strategies to improve their activity are listed. The mechanisms for H 2 O 2 production over modified photocatalysts are discussed to highlight the facilitating role of the modification methods. Besides, methods for the quantification of H 2 O 2 and associated radical intermediates are provided to guide future studies in this field.

show abstract

Zn Cd1–S quantum dot with enhanced photocatalytic H2-production performance

Cited by 97 publications

References 67 publications

Constructing 1D/2D Schottky-Based Heterojunctions between Mn<sub>0.2</sub>Cd<sub>0.8</sub>S Nanorods and Ti<sub>3</sub>C<sub>2</sub> Nanosheets for Boosted Photocatalytic H<sub>2</sub> Evolution

Constructing 1D/2D Schottky-Based Heterojunctions between Mn<sub>0.2</sub>Cd<sub>0.8</sub>S Nanorods and Ti<sub>3</sub>C<sub>2</sub> Nanosheets for Boosted Photocatalytic H<sub>2</sub> Evolution

Design, Fabrication, and Mechanism of Nitrogen‐Doped Graphene‐Based Photocatalyst

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Contact Info

Product

Resources

About

Zn Cd1–S quantum dot with enhanced photocatalytic H2-production performance

Cited by 97 publications

References 67 publications

Constructing 1D/2D Schottky-Based Heterojunctions between Mn<sub>0.2</sub>Cd<sub>0.8</sub>S Nanorods and Ti<sub>3</sub>C<sub>2</sub> Nanosheets for Boosted Photocatalytic H<sub>2</sub> Evolution

Constructing 1D/2D Schottky-Based Heterojunctions between Mn<sub>0.2</sub>Cd<sub>0.8</sub>S Nanorods and Ti<sub>3</sub>C<sub>2</sub> Nanosheets for Boosted Photocatalytic H<sub>2</sub> Evolution

Design, Fabrication, and Mechanism of Nitrogen‐Doped Graphene‐Based Photocatalyst

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

Contact Info

Product

Resources

About

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production