Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (10): 2484-2499.DOI: 10.1016/S1872-2067(22)64102-0
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Chen Guana,b, Xiaoyang Yuea,b, Jiajie Fanc, Quanjun Xianga,b,*()
Received:
2022-02-28
Accepted:
2022-04-04
Online:
2022-10-18
Published:
2022-09-30
Contact:
Quanjun Xiang
Supported by:
Chen Guan, Xiaoyang Yue, Jiajie Fan, Quanjun Xiang. MXene quantum dots of Ti3C2: Properties, synthesis, and energy-related applications[J]. Chinese Journal of Catalysis, 2022, 43(10): 2484-2499.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64102-0
Fig. 2. Preparation mechanism and application of MXene quantum dots. Oxygen-containing functional groups are formed on 2D MXenes, possibly generating defects and allowing the 2D MXene to be cut into quantum dots.
Fig. 3. Schematic of the energy-level structure and carrier transfer processes of MQDs and N-MQDs. Nitrogen doping-introduced trap states close to the LUMO, achieving rapid electron migration and increasing the carrier lifetime.
Fig. 4. Charge density difference between the pure MXene QDs and heteroatom-functionalized MXene QDs. (a) Pure Ti3C2 MXene QDs. (b) N-functionalized Ti3C2 MXene. (c) P-functionalized Ti3C2 MXene QDs. (d) N-P-functionalized MQDs. Red and blue isosurfaces represent electron accumulation and depletion during the chemical bond formation process, respectively. In (b-d), the enhanced blue color indicates electron depletion, demonstrating that impurity atoms cause charge transfer and increase the PLQYs of the N-P-functionalized MQDs. Reprinted with permission from Ref. [49]. Copyright 2019, Royal Society of Chemistry.
Synthesis method | Applicable MXene (published) | Advantage | Disadvantage |
---|---|---|---|
Hydrothermal method | Ti3C2 MQDs | concise operation, large-scale production | oxidation, HF, high temperature |
Solvothermal method | Ti3C2Tx QDs | better morphology control | oxidation, HF, high temperature |
Hydrothermal/solvothermal- ultrasound method | Ti3C2 MQDs | accelerate the fragmentation of MXene into MQDs, suppress MXene oxidation | time-consuming, cumbersome process |
Molten salt synthesis | Mo2C MQDs | high atom usage, precise morphology control | high temperature, low production yield |
Acoustomicrofluidic method | Ti3C2Tz QDs | chemical-free method, preserve the structural integrity of the material | — |
Direct ultrasound method | Ti3C2 MQDs | safe, simple, fluorine-free method | time-consuming |
Table 1 Methods for preparing MQDs and differences between different routes.
Synthesis method | Applicable MXene (published) | Advantage | Disadvantage |
---|---|---|---|
Hydrothermal method | Ti3C2 MQDs | concise operation, large-scale production | oxidation, HF, high temperature |
Solvothermal method | Ti3C2Tx QDs | better morphology control | oxidation, HF, high temperature |
Hydrothermal/solvothermal- ultrasound method | Ti3C2 MQDs | accelerate the fragmentation of MXene into MQDs, suppress MXene oxidation | time-consuming, cumbersome process |
Molten salt synthesis | Mo2C MQDs | high atom usage, precise morphology control | high temperature, low production yield |
Acoustomicrofluidic method | Ti3C2Tz QDs | chemical-free method, preserve the structural integrity of the material | — |
Direct ultrasound method | Ti3C2 MQDs | safe, simple, fluorine-free method | time-consuming |
Fig. 5. Comparison of three MQD synthesis methods. (a) Hydrothermal and solvothermal synthesis processes. (b) Hydrothermal/solvother- mal-ultrasound synthesis process. (c) Molten salt synthesis process.
Fig. 6. (a) XRD patterns of the initial Mo2C/C sample without centrifugal treatment and the final Mo2C/C sample with centrifugal treatment. STEM (b) and EDS (d,e) images of Mo2C/C nanosheets. (c) HRTEM image of Mo2C QD/C nanosheets. (f) Nitrogen adsorption energy of Mo2C and C. (g) Atomic structure scheme showing the reaction pathway of N2 reduction on Mo2C sites. Green, gray, blue, and white balls represent Mo, C, N, and H atoms, respectively. Reprinted with permission from Ref. [65]. Copyright 2018, Wiley-VCH.
Fig. 7. (a) Schematic of the experimental setup: the multilayer Ti3C2Tz MXene sample is atomized on the SRBW device with the formation of layered and cracked Ti3C2Tz aerosol droplets. (b) Condensate (MXene nanosheets and MQDs) collected under different cycles (evolution along with increasing cycles). (c) Atomic force microscopic (AFM) images (including sample thickness profiles) and the corresponding thickness and mean lateral-diameter measurement distributions of the acoustically synthesized MXene nanosheets and MQDs after 10 nebulization cycles. Reprinted with permission from Ref. [67]. Copyright 2021, American Chemical Society.
Fig. 8. TEM (a) and HRTEM (b) images of Ti3C2 QD/Cu2O NW/Cu heterostructure. UV-vis diffuse reflectance spectra (c) and yields of methanol as a function of time (d). Reprinted with permission from Ref. [13]. Copyright 2018, Wiley-VCH.
Synthesis method | Crystal structure | Functional group | Fermi level (V) | Optical absorption ability |
---|---|---|---|---|
MQD | Hexagonal symmetry | -O, -F, -OH, etc. | -0.523 | Red shift |
MXene | 0.71 | Blue shift |
Table 2 Comparisons of MQDs and MXenes.
Synthesis method | Crystal structure | Functional group | Fermi level (V) | Optical absorption ability |
---|---|---|---|---|
MQD | Hexagonal symmetry | -O, -F, -OH, etc. | -0.523 | Red shift |
MXene | 0.71 | Blue shift |
Fig. 10. (a) Scanning Kelvin probe maps of BiVO4, Ti3C2 QD/BiVO4 (TC QD/BV), BiVO4@ZnIn2S4(BV@ZIS), and BiVO4@ZnIn2S4/Ti3C2 QDs (BV@ZIS/TC QDs). (b) Steady-state PL spectra. (c) Schematic of the band structure and electron-hole transfer mechanism for BV@ZIS/TC QDs. Reprinted with permission from Ref. [73]. Copyright 2021, Elsevier.
Fig. 11. (a) Simulated electron density distribution at the interface between Ti3C2Tx and ZnIn2S4 nanosheets. (Ti blue, C brown, O red, Bi purple, Mo silver, and S yellow balls. Yellow and blue areas in (a) represent higher and lower electron densities, respectively). (b) Energy band diagram of Ti3C2Tx and ZnIn2S4. Reprinted with permission from Ref. [74]. Copyright 2020, Wiley-VCH.
MQD-based material | Type of MQDs | Composite structure | Application | Performance | Ref. |
---|---|---|---|---|---|
Cu2O NW/Ti3C2 | Ti3C2 | one dimension (1D)/ zero dimension (0D) | CO2 reduction | CH3OH (78.50 μmol g-1 h-1); | [ |
TiO2/C3N4/Ti3C2 | Ti3C2 | 2D/2D/0D | CO2 reduction | CO (4.39 μmol g-1 h-1); CH4 (1.20 μmol g-1 h-1) | [ |
g-C3N4/Ti3C2 | Ti3C2 | 2D/0D | H2 evolution | H2 (5111.8 μmol g-1 h-1) | [ |
CdS/Ti3C2 | Ti3C2 | 0D/0D | H2 evolution | H2 (14342 μmol g-1 h-1) | [ |
Ti3C2/Ni MOF | Ti3C2 | 0D/2D | N2 photoreduction | NH3 (88.79 μmol gcat-1 h-1) | [ |
Ti3C2/ZnIn2S4/BiVO4 | Ti3C2 | 0D/2D/three dimension (3D) | photocatalytic overall water splitting | O2 (50.83 μmol g-1 h-1), H2 (102.67 μmol g-1 h-1) | [ |
Ti3C2/SiC | Ti3C2 | 0D/2D | photocatalytic NO pollutant removal | NO pollutant removal efficiency 74.6% | [ |
Ti3C2Tx/Ti3C2Tx/S | Ti3C2Tx | 0D/2D | lithium-sulfur batteries | when sulfur loading is 13.8 mg cm-2, volumetric capacity is 1957 mA h cm-3 and areal capacity is 13.7 mA h cm-2 | [ |
Ti3C2Tx/Ti3C2Tx/RGO | Ti3C2Tx | supercapacitors | volumetric capacity (542 F cm-3) | [ | |
Ti3C2 | Ti3C2 | 0D | multicolor cellular imaging | [ | |
N-Ti3C2 | Ti3C2 | 0D | Fe3+ detection | detectable concentration (2-500 μmol L-1), limit of detection (2 μmol L-1) | [ |
Ti3C2 | Ti3C2 | 0D | immunomodulation | — | [ |
V2C | V2C | 0D | nucleus-target low-temperature photothermal therapy | — | [ |
MoS2 QD@Ti3C2Tx QD@MWCNTs | Ti3C2Tx | electrocatalytic methanol oxidation | maximum methanol oxidation current density at 2.2 V of 160 A g-1 | [ | |
Co-Ti3C2 | Ti3C2 | 0D | photoelectrochemical water oxidation | water oxidation performance (2.99 mA cm-2 at 1.23 V vs. RHE) | [ |
Table 3 Summary of applications of various MQD-based photocatalysts.
MQD-based material | Type of MQDs | Composite structure | Application | Performance | Ref. |
---|---|---|---|---|---|
Cu2O NW/Ti3C2 | Ti3C2 | one dimension (1D)/ zero dimension (0D) | CO2 reduction | CH3OH (78.50 μmol g-1 h-1); | [ |
TiO2/C3N4/Ti3C2 | Ti3C2 | 2D/2D/0D | CO2 reduction | CO (4.39 μmol g-1 h-1); CH4 (1.20 μmol g-1 h-1) | [ |
g-C3N4/Ti3C2 | Ti3C2 | 2D/0D | H2 evolution | H2 (5111.8 μmol g-1 h-1) | [ |
CdS/Ti3C2 | Ti3C2 | 0D/0D | H2 evolution | H2 (14342 μmol g-1 h-1) | [ |
Ti3C2/Ni MOF | Ti3C2 | 0D/2D | N2 photoreduction | NH3 (88.79 μmol gcat-1 h-1) | [ |
Ti3C2/ZnIn2S4/BiVO4 | Ti3C2 | 0D/2D/three dimension (3D) | photocatalytic overall water splitting | O2 (50.83 μmol g-1 h-1), H2 (102.67 μmol g-1 h-1) | [ |
Ti3C2/SiC | Ti3C2 | 0D/2D | photocatalytic NO pollutant removal | NO pollutant removal efficiency 74.6% | [ |
Ti3C2Tx/Ti3C2Tx/S | Ti3C2Tx | 0D/2D | lithium-sulfur batteries | when sulfur loading is 13.8 mg cm-2, volumetric capacity is 1957 mA h cm-3 and areal capacity is 13.7 mA h cm-2 | [ |
Ti3C2Tx/Ti3C2Tx/RGO | Ti3C2Tx | supercapacitors | volumetric capacity (542 F cm-3) | [ | |
Ti3C2 | Ti3C2 | 0D | multicolor cellular imaging | [ | |
N-Ti3C2 | Ti3C2 | 0D | Fe3+ detection | detectable concentration (2-500 μmol L-1), limit of detection (2 μmol L-1) | [ |
Ti3C2 | Ti3C2 | 0D | immunomodulation | — | [ |
V2C | V2C | 0D | nucleus-target low-temperature photothermal therapy | — | [ |
MoS2 QD@Ti3C2Tx QD@MWCNTs | Ti3C2Tx | electrocatalytic methanol oxidation | maximum methanol oxidation current density at 2.2 V of 160 A g-1 | [ | |
Co-Ti3C2 | Ti3C2 | 0D | photoelectrochemical water oxidation | water oxidation performance (2.99 mA cm-2 at 1.23 V vs. RHE) | [ |
Fig. 13. (a) Energy band positions of Ti3C2 QD/Ni MOF. (b) Scheme of the spatial charge separation and transportation during photocatalytic N2 reduction using Ti3C2 QD/Ni MOF. (c) HRTEM images of Ti3C2 QD/Ni MOF nanosheets. (d) Change in the N-N bond length and free energy against the reaction coordinate during the reaction process. Reprinted with permission from Ref. [15]. Copyright 2020, American Chemical Society.
Fig. 15. Schematic of the evolution of active materials during the discharge process for TC-100/S cathodes. Process 1: more active material accumulation on TCS is beneficial for penetrating electrolytes and transferring electrons and ions in TCD-TCS. Process 2: as lithiation progresses, the outstanding LiPS capture ability of TCD-TCS effectively inhibits the occurrence of the LiPS shuttle effect.
Fig. 16. (a) Preparation schematic of all-solid-state asymmetric fiber supercapacitors. (b) SEM image of the fiber electrode. (c) Galvanostatic charge-discharge curves at 0.25 A cm-3. (d) Specific capacitance at different current densities. Reprinted with permission from Ref. [17]. Copyright 2020, American Chemical Society.
Fig. 17. (a) Schematic of the synthesis of Ti3C2 QDs using a hydrothermal method for bioimaging. (b,c) HRTEM and AFM images of Ti3C2 QDs. (d) Bioimaging image of RAW264.7 cells after Ti3C2 QD uptake. Reprinted with permission from Ref. [29]. Copyright 2017, Wiley-VCH.
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