Design, Performance, and Application of Thermoelectric Nanogenerators

Zhang, Ding; Wang, Yuanhao; Yang, Ya

doi:10.1002/smll.201805241

Cited by 86 publications

(76 citation statements)

References 135 publications

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“…Thermoelectric (TE) conversion technology, through directly converting waste heat into electricity, [ 1–4 ] has drawn strong interest in the energy science sector. To keep pace with the demand of continuous miniaturization of thermoelectric devices, recently much attention has been devoted to the development of 2D high‐efficiency TE materials with controllable thickness.…”

Section: Introductionmentioning

confidence: 99%

High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band‐Extrema Alignment

Zhang

Liu

Tao

et al. 2020

Adv Funct Materials

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The discovery of a record high figure of merit (ZT) of ≈2.6 associated with bulk SnSe has stimulated considerable enthusiasm in searching for 2D systems with similar high ZT. However, previously reported 2D thermoelectric (TE) materials generally possess very low ZT due to the high lattice thermal conductivity (κ L ) and/or small power factor (PF). Herein, a very high ZT (≈2.08) value associated with atomically thin 2D KAgSe nanosheet is reported, which also exhibits an unprecedented low intrinsic κ L (≈0.03 Wm −1 K −1 at 700 K for trilayer) and fairly large PF. The low κ L mainly stems from the high lattice anharmonicity induced by both the "interfacial shear slip" vibrations and the asymmetric "AgSe pair" vibrations from distorted AgSe 4 tetrahedrons. Meanwhile, the complete band-extrema alignment and coexistence of heavy and light bands result in an optimal Seebeck coefficient and electrical conductivity, thereby a large PF. This work suggests not only an alternative way to acquiring high lattice anharmonicity but also a highly competitive 2D TE candidate for wide applications.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.202001200.devices, recently much attention has been devoted to the development of 2D highefficiency TE materials with controllable thickness. [5][6][7] In general, the TE efficiency is characterized by the dimensionless figure of merit ZT = S 2 σT/(κ L + κ e ), where S, σ, T, κ L , and κ e are Seebeck coefficient, electrical conductivity, absolute temperature, lattice thermal conductivity and electronic thermal conductivity, respectively. Apparently, the high TE efficiency can be achieved by increasing the power factor (PF = S 2 σ) together with suppressing the sum of thermal conductivity (κ L + κ e ).Currently, the TE efficiency can be improved by two approaches: i) Tuning effective mass to improve the electronic transport and ii) increasing phonon scattering to suppress the lattice thermal transport. [8][9][10][11] For a given carrier concentration, a large carrier effective mass (m*) contributes to a large S, and the m* is proportional to the band effective mass (m b *) according to m* = N V 2/3 m b *, where N V refers to the band degeneracy. [10,12] A large m b *, however, will reduce the carrier mobility μ since m b 1/ * 2 µ ∝ (2D systems). [13][14][15][16] Hence, to optimize S 2 σ, it is important to attain high N V and moderate m b * simultaneously. A high N V can be achieved either by mixing two types of low-symmetric compounds into a reconstructed highly symmetric structure or by alloying/doping to converge different bands in the Brillouin zone. [8,[17][18][19] For electronic bands at the band edge, a moderate m b * can be realized in principle through element doping or strain engineering. [20] However, in practice, many compounds have limited doping capability and are easily damaged by strain; and the crystal symmetry of the reconstructed structure is uncontrollable. Regarding increasing phonon scattering, intro...

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Section: Introductionmentioning

confidence: 99%

High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band‐Extrema Alignment

Zhang

Liu

Tao

et al. 2020

Adv Funct Materials

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“…Nanotechnology has affected both material optimization and structural designs in thermoelectric nanogenerators. [20] Nanogenerators show promising applications in artificial intelligence, self-powered sensing systems, wearable electronics, artificial neuromorphic system and other fields in the future. [21] In these future applications, structural design and material selection have been the key factors.…”

Section: Doi: 101002/smll201902246mentioning

confidence: 99%

“…Thermal energy harvesting from the ambient environment is an ideal way to realize self‐powered operation of electronics, which can be realized with thermoelectric nanogenerators. Nanotechnology has affected both material optimization and structural designs in thermoelectric nanogenerators . Nanogenerators show promising applications in artificial intelligence, self‐powered sensing systems, wearable electronics, artificial neuromorphic system and other fields in the future .…”

mentioning

confidence: 99%

Nanomaterials Innovation

Wang

Chou

Zhang

2019

Small

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“…This is one reason why researchers are particularly focusing on solid‐state technologies; the most advanced and most commonly applied examples of these are thermoelectrics, which exploit the Seebeck effect . Recent advances along this line include the development of new materials and fabrication methods, the development of flexible modules, and thermoelectric nanogenerators . Thermoelectric technology systems do not have moving parts, operate over different temperature ranges, and the flexibility of the utilized modules enables a broad variety of applications.…”

Section: Introductionmentioning

confidence: 99%

“…[65][66][67] Recent advances along this line include the development of new materials and fabrication methods, [68,69] the development of flexible modules, [70][71][72] and thermoelectric nanogenerators. [73] Thermoelectric technology systems do not have moving parts, operate over different temperature ranges, and the flexibility of the utilized modules enables a broad variety of applications. However, despite the important Andrej Kitanovski is the head of the research group in the field of refrigeration and heat pumping at the Faculty of Mechanical Engineering at the University of Ljubljana.…”

Section: Introductionmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

359

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Design, Performance, and Application of Thermoelectric Nanogenerators

Cited by 86 publications

References 135 publications

High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band‐Extrema Alignment

High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band‐Extrema Alignment

Nanomaterials Innovation

Energy Applications of Magnetocaloric Materials

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