Insights into different dimensional MXenes for photocatalysis

Zhang, Ke; Li, Danqing; Cao, Hongyang; Zhu, Quihui; Trapalis, Christos; Zhu, Pengfei; Gao, Xinhua; Wang, Chuanyi

doi:10.1016/j.cej.2021.130340

Cited by 82 publications

(41 citation statements)

References 83 publications

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“…Photocatalytic conversion of CO 2 into renewable fuels and value-added chemicals using sustainable solar energy is a promising technique for resolving the energy and environmental issues simultaneously . A great deal of effort has been devoted to developing high-efficient photocatalysts for CO 2 reduction. − Among the multitudinous types of photocatalytic materials, ZnIn 2 S 4 (ZIS), due to its appropriate band structure, visible-light response, and considerable chemical stability, has exhibited great potential in photocatalytic solar-energy conversion. − Nevertheless, the photocatalytic efficiencies of ZIS are still far from satisfactory due to its poor surface area and severe charge recombination. To improve its photocatalytic performance, some modifications, such as metal ion doping , and coupling with other semiconductor materials, , have been made on ZIS.…”

Section: Introductionmentioning

confidence: 99%

Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction

Qin

Zhao

et al. 2021

J. Phys. Chem. C

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ZnIn2S4 (ZIS) has shown great potential in photocatalytic solar-energy conversion. However, it is still suffering from severe charge recombination and poor surface area. Nonmetal heteroatom doping is considered as an effective strategy for improving its photocatalytic performance. Herein, phosphorus-doped ZIS (P-ZIS) nanosheets were prepared by a simple hydrothermal treatment of ZIS using NaH2PO4 as a precursor. The effect of P doping on the crystal structure, band structure, and the photocatalytic CO2 reduction activity of ZIS under visible light were investigated. It was found that P doping in the lattice of ZIS plays a key role in tuning its electronic properties. The ratio of ZIS to NaH2PO4 influences the photocatalytic performance of P-ZIS, and the optimum ratio is 1:15. Optimized P-ZIS exhibits a remarkable visible-light photocatalytic CO production rate of 18.8 μmol/30 min, 2.5-folds higher than that of the pure ZIS. The ultrathin nanosheets feature and an upward shift of CB edge result in the enhancement of CO2 photoreduction efficiency of P-ZIS. This work demonstrates a simple route for P doping in ZIS and provides guidance for the controllable design and synthesis of high-efficient photocatalysts by nonmetal heteroatom doping.

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Section: Introductionmentioning

confidence: 99%

Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction

Qin

Zhao

et al. 2021

J. Phys. Chem. C

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“…Further, a composite comprising MXene and its corresponding metal oxide can be synthesized simply by subjecting the MXene to an intentional oxidation. Thus, far, several review articles have summarized the progress of the MXene-based composites syntheses and photocatalytic HER activities. ,,,,− …”

Section: Hydrogen Productionmentioning

confidence: 99%

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

et al. 2022

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Photocatalytic water splitting, CO2 reduction, and pollutant degradation have emerged as promising strategies to remedy the existing environmental and energy crises. However, grafting of expensive and less abundant noble-metal cocatalysts on photocatalyst materials is a mandatory practice to achieve enhanced photocatalytic performance owing to the ability of the cocatalysts to extract electrons efficiently from the photocatalyst and enable rapid/enhanced catalytic reaction. Hence, developing highly efficient, inexpensive, and noble-metal-free cocatalysts composed of earth-abundant elements is considered as a noteworthy step toward considering photocatalysis as a more economical strategy. Recently, MXenes (two-dimensional (2D) transition-metal carbides, nitrides, and carbonitrides) have shown huge potential as alternatives for noble-metal cocatalysts. MXenes have several excellent properties, including atomically thin 2D morphology, metallic electrical conductivity, hydrophilic surface, and high specific surface area. In addition, they exhibit Gibbs free energy of intermediate H atom adsorption as close to zero and less than that of a commercial Pt-based cocatalyst, a Fermi level position above the H2 generation potential, and an excellent ability to capture and activate CO2 molecules. Therefore, there is a growing interest in MXene-based photocatalyst materials for various photocatalytic events. In this review, we focus on the recent advances in the synthesis of MXenes with 2D and 0D morphologies, the stability of MXenes, and MXene-based photocatalysts for H2 evolution, CO2 reduction, and pollutant degradation. The existing challenges and the possible future directions to enhance the photocatalytic performance of MXene-based photocatalysts are also discussed.

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“…The excellent conductivity and anisotropic carrier transport of MXenes have accelerated electron transport and suppressed recombination of photogenerated carrier pairs . The addition of MXenes acts an effective way to improve photocatalytic activity − for hydrogen evolution and carbon dioxide reduction.…”

Section: Mxenes For Energy Conversionmentioning

confidence: 99%

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

et al. 2021

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Insights into different dimensional MXenes for photocatalysis

Cited by 82 publications

References 83 publications

Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction

Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

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Insights into different dimensional MXenes for photocatalysis

Cited by 82 publications

References 83 publications

Metal-Free Phosphorus-Doped ZnIn2S4 Nanosheets for Enhanced Photocatalytic CO2 Reduction

Metal-Free Phosphorus-Doped ZnIn2S4 Nanosheets for Enhanced Photocatalytic CO2 Reduction

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

Contact Info

Product

Resources

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Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction

Metal-Free Phosphorus-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic CO₂ Reduction