A5008598564- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Perovskite Materials and Applications
- High-Temperature Coating Behaviors
- 2D Materials and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Perfectionism, Procrastination, Anxiety Studies
- Thermal Expansion and Ionic Conductivity
- Heusler alloys: electronic and magnetic properties
- Quantum Dots Synthesis And Properties
- Advanced materials and composites
- Metal Alloys Wear and Properties
- Magnetic and transport properties of perovskites and related materials
- Advanced Semiconductor Detectors and Materials
- Advanced ceramic materials synthesis
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Metal and Thin Film Mechanics
- Phase-change materials and chalcogenides
- Aluminum Alloys Composites Properties
- Crystal Structures and Properties
- Nuclear Materials and Properties
- ZnO doping and properties
Beihang University
2016-2025
Zhejiang International Studies University
2024-2025
Southwest University
2024
Shandong University of Science and Technology
2024
Center for High Pressure Science and Technology Advanced Research
2024
RWTH Aachen University
2011-2024
The First People’s Hospital of Lianyungang
2024
North China University of Technology
2022-2024
Harbin Institute of Technology
2024
University of Science and Technology Liaoning
2024
Heat conversion gets a power boost Thermoelectric materials convert waste heat into electricity, but often achieve high efficiencies only at temperatures. Zhao et al. tackle this problem by introducing small amounts of sodium to the thermoelectric SnSe (see Perspective Behnia). This boosts factor, allowing material generate more energy while maintaining good efficiency. The effect holds across wide temperature range, which is attractive for developing new applications. Science , issue p. 141...
Thermoelectric materials have drawn vast attentions for centuries, because thermoelectric effects enable direct conversion between thermal and electrical energy, thus providing an alternative power generation refrigeration. This review summaries the phenomena, applications parameter relationships. The approaches used performance enhancement are outlined, including: modifications of electronic band structures convergence to enhance Seebeck coefficients; nanostructuring all-scale hierarchical...
Thermoelectric technology enables the harvest of waste heat and its direct conversion into electricity. The efficiency is determined by materials figure merit ZT Here we show a maximum ~2.8 ± 0.5 at 773 kelvin in n-type tin selenide (SnSe) crystals out plane. thermal conductivity layered SnSe lowest out-of-plane direction [two-dimensional (2D) phonon transport]. We doped with bromine to make overlapping interlayer charge density (3D transport). A continuous phase transition increases...
This review discusses recent developments and current research in high performance bulk thermoelectric materials, comprising nanostructuring, mesostructuring, band alignment, engineering synergistically defining key strategies for boosting the performance. To date, dramatic enhancements figure of merit achieved materials have come either from reduction lattice thermal conductivity or improvement power factors, both them. Here, we summarize these relationships between very large with...
We report a high ZT of ∼2.0 at 823 K for 2% Na-doped PbTe with 6% MgTe excellent thermal stability. attribute the thermoelectric performance to synergistic combination enhanced power factor, reduction lattice conductivity and simultaneous suppression bipolar conductivity. inclusion in owns triple functions: Mg alloying within solubility limit modifies valence band structure by pushing two bands (L Σ bands) closer energy, thereby facilitating charge carrier injection. When is exceeded,...
This review summarizes the crystal structures, microstructures, electronic physical/chemical properties, and effective methods to enhance thermoelectric performance of BiCuSeO system.
SnTe is a potentially attractive thermoelectric because it the lead-free rock-salt analogue of PbTe. However, poor material its high hole concentration arising from inherent Sn vacancies in lattice and very electrical thermal conductivity. In this study, we demonstrate that SnTe-based materials can be controlled to become excellent thermoelectrics for power generation via successful application several key concepts obviate well-known disadvantages SnTe. First, show self-compensation...
The broad-based implementation of thermoelectric materials in converting heat to electricity hinges on the achievement high conversion efficiency. Here we demonstrate a figure merit ZT 2.5 at 923 K by cumulative integration several performance-enhancing concepts single material system. Using non-equilibrium processing show that hole-doped samples PbTe can be heavily alloyed with SrTe well beyond its thermodynamic solubility limit <1 mol%. much higher levels Sr into matrix widen bandgap and...
It is remarkable that SnSe exhibits complex band structures and strong anharmonic bonding, endowing it with a high power factor low thermal conductivity.
Lower-cost thermoelectrics Thermoelectric materials convert heat to electricity, making them attractive for harvesting or cooling applications. However, many high-performance are made of expensive toxic materials. He et al. found that a material composed primarily tin and sulfur could be optimized have relatively good thermoelectric properties. Introducing about 10% selenium sulfide helped tune these properties by electronic band manipulation. This is step toward more earth-abundant, less...
Lead sulfide, a compound consisting of elements with high natural abundance, can be converted into an excellent thermoelectric material. We report extensive doping studies, which show that the power factor maximum for pure n-type PbS raised substantially to ∼12 μW cm–1 K–2 at >723 K using 1.0 mol % PbCl2 as electron donor dopant. also lattice thermal conductivity greatly reduced by adding selected metal sulfide phases. The 723 ∼50%, 52%, 30%, and 42% through introduction up 5.0 Bi2S3, Sb2S3,...
We report a significant enhancement of the thermoelectric performance p-type SnTe over broad temperature plateau with peak ZT value ∼1.4 at 923 K through In/Cd codoping and CdS nanostructuring approach. Indium cadmium play different but complementary roles in modifying valence band structure SnTe. Specifically, In-doping introduces resonant levels inside bands, leading to considerably improved Seebeck coefficient low temperature. Cd-doping, however, increases remarkably mid- high-temperature...
Operating across a wide temperature range is priority for thermoelectric materials
There is a need to develop highly selective and efficient materials for capturing uranium (normally as UO2(2+)) from nuclear waste seawater. We demonstrate the promising adsorption performance of S(x)-LDH composites (LDH Mg/Al layered double hydroxide, [S(x)](2-) polysulfide with x = 2, 4) uranyl ions variety aqueous solutions including report high removal capacities (q(m) 330 mg/g), large K(d)(U) values (10(4)-10(6) mL/g at 1-300 ppm U concentration), % removals (>95% 1-100 ppm, or ∼80% ppb...
A cooler tin selenide Thermoelectric materials can convert heat into electricity or be used as the basis of cooling devices. Qin et al . found that doping a thermoelectric material with lead and sodium improved room temperature properties, an effect created by manipulation electronic bands. The authors showed could not only for power generation but also cooling. If optimal contact are identified, then this approach may attractive future applications. —BG
We demonstrate a high solubility limit of >9 mol% for MnTe alloying in SnTe. The electrical conductivity SnTe decreases gradually while the Seebeck coefficient increases remarkably with increasing content, leading to enhanced power factors. room-temperature coefficients Mn-doped are significantly higher than those predicted by theoretical Pisarenko plots pure SnTe, indicating modified band structure. high-temperature Hall data Sn1-xMnxTe show strong temperature dependence, suggestive...
We report on the high thermoelectric performance of p-type polycrystalline BiCuSeO, a layered oxyselenide composed alternating conductive (Cu2Se2)2− and insulating (Bi2O2)2+ layers. The electrical transport properties BiCuSeO materials can be significantly improved by substituting Bi3+ with Ca2+. resulting exhibit large positive Seebeck coefficient ∼+330 μV K−1 at 300 K, which may due to 'natural superlattice' structure moderate effective mass suggested both electronic density states carrier...
p -type BiCuSeO, a layered oxyselenide composed of conductive (Cu2Se2)2− layers alternately stacked with insulating (Bi2O2)2+ layers, shows an enhancement the electrical conductivity after substituting Bi3+ by Sr2+, from 470 S m−1 (BiCuSeO) to 4.8×104 (Bi0.85Sr0.15CuSeO) at 293 K. Coupled high Seebeck coefficients, this leads promising values thermoelectric power factor that exceeds 500 μW K−2 873 Moreover, thermal these compounds is lower than 1 W K−1 Maximum ZT reach 0.76 K, making family...
Previous efforts to enhance thermoelectric performance have primarily focused on reduction in lattice thermal conductivity caused by broad-based phonon scattering across multiple length scales. Herein, we demonstrate a design strategy which provides for simultaneous improvement of electrical and properties p-type PbSe leads ZT ~ 1.6 at 923 K, the highest ever reported tellurium-free chalcogenide. Our goes beyond recent ideas reducing adding two key new theory-guided concepts engineering,...