研究目的
To investigate the enhancement of thermoelectric properties in nanoscale Cu2-xSe through size effects using a modified solvothermal synthesis method.
研究成果
The size effect significantly enhances the thermoelectric properties of nanoscale Cu2-xSe, achieving a ZT of ~1.51 at 873 K, which is 2.67 times higher than mesoscale samples. The solvothermal method is effective, simple, and scalable for synthesizing nanostructured thermoelectric materials.
研究不足
The study is limited to Cu2-xSe materials; the growth process details for nanoscale particles require further investigation; scalability and application in other thermoelectric materials need validation.
1：Experimental Design and Method Selection:
A modified facile one-pot solvothermal method was used to synthesize Cu2-xSe powders with controllable sizes by adjusting the Se-to-NaOH molar ratio. Spark plasma sintering (SPS) was employed to prepare pellets for thermoelectric property measurements.
2：Sample Selection and Data Sources:
Cu2-xSe powders were synthesized from raw materials including CuCl2·2H2O, SeO2, NaOH, PVP, glucose, and TEG. Samples were characterized using XRD, SEM, Hall effect measurements, thermal diffusivity, specific heat capacity, electrical conductivity, Seebeck coefficient, and ICP-AES.
3：List of Experimental Equipment and Materials:
Chemicals from Aladdin Industrial Corporation and Sinopharm Chemical Reagent Co., Ltd.; equipment includes SPS (SPS-3.20 mkII), XRD (D-8 Advance, Bruker), SEM (JEOL 7800), physical property measurement system (HET-TR, JouleYacht), laser flash thermal analyzer (LFA457, NETZSCH), LSR-3 system (Linseis), DSC (DSC 8000, Perkin Elmer), ICP-AES (OPTIMA 7000DV, Perkin Elmer).
4：20 mkII), XRD (D-8 Advance, Bruker), SEM (JEOL 7800), physical property measurement system (HET-TR, JouleYacht), laser flash thermal analyzer (LFA457, NETZSCH), LSR-3 system (Linseis), DSC (DSC 8000, Perkin Elmer), ICP-AES (OPTIMA 7000DV, Perkin Elmer). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Raw materials were mixed and heated in a three-necked flask at 483 K for 6 h. The resulting suspension was centrifuged, washed, dried, and sintered by SPS at 850 K under 50 MPa for 10 min. TE properties were measured on sintered pellets.
5：Data Analysis Methods:
Thermal conductivity calculated as κ = D × Cp × d; electrical properties measured using Hall effect; data analyzed for trends in σ, S, κ, and ZT with temperature and size.
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X-ray Diffractometer
D-8 Advance
Bruker
Used for XRD analysis to determine crystal structure and phase composition of samples.
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Scanning Electron Microscope
JEOL 7800
JEOL
Used for SEM imaging to analyze morphology and structure of Cu2-xSe powders and pellets.
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Differential Scanning Calorimeter
DSC 8000
Perkin Elmer
Used to measure specific heat capacity (Cp).
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Inductively Coupled Plasma-Atomic Emission Spectrometer
OPTIMA 7000DV
Perkin Elmer
Used for ICP-AES to confirm atomic ratios of elements in samples.
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Spark Plasma Sintering System
SPS-3.20 mkII
Used for sintering Cu2-xSe powders into pellets under high pressure and temperature.
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Physical Property Measurement System
HET-TR
JouleYacht
Used for Hall effect measurements to determine carrier concentration and mobility.
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Laser Flash Thermal Analyzer
LFA457
NETZSCH
Used to measure thermal diffusivity (D) for calculating thermal conductivity.
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Thermoelectric Property Testing System
LSR-3
Linseis
Used to measure electrical conductivity (σ) and Seebeck coefficient (S) synchronously.
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