Inhomogeneous thermoelectric materials: improving overall zT by localized property variations

Prasad, Narasimha S.; Nemir, David; Beck, Jan; Maddux, Jay R.; Taylor, Patrick J.

doi:10.1117/12.2181143

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Being solid-state energy conversion technique, it has advantages of reliability, simplicity, lightweight, compactness, and environmental friendliness [1,3]. To make TE technology feasible, it requires significant improvement in conversion efficiency (η), which is jointly determined by the Carnot efficiency and the dimensionless figure of merit [4], 𝑧𝑇 = 𝑆 2 𝑇/(𝑘 𝐿 + 𝑘 𝐸 ), where S is the Seebeck coefficient,  is the electrical conductivity, T is the absolute temperature, and k L and k E are the lattice and electronic thermal conductivities, respectively. Improving zT of a TE material by simultaneous optimization of transport parameters is a major fundamental challenge since these parameters are heavily interdependent [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Multi-source energy harvesting technology using piezoelectric and thermoelectric materials

Prasad,

Li,

Karan

et al. 2024

Energy Harvesting and Storage: Materials, Devices, and Applications XIV

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Energy harvesting using various locally available energy sources such as vibration energy, heat, sound, or magnetic field have become attractive topics for supplying power to modular electronic devices making them run independently in extreme environments. In this paper, we will be discussing the perspectives on thermoelectric (TE) and piezoelectric materials and devices, and then the concept of multi-source energy harvester using piezoelectric and thermoelectric devices and integration of them into a reliable and independent power source. TE materials having low thermal conductivity and high figure-of-merit (zT) are developed to convert even a small temperature gradient efficiently into electrical energy with the state-of-the-art conversion efficiency of ~15% and output power of ~56 W from single device. The piezoelectric device architecture is configured using high performance piezoelectric ceramics (Cu-Mn-PIN-PMN-PT). These ceramics exhibit high piezoelectric coefficient with high mechanical quality factor and low dielectric loss factor. Using these piezoelectric materials, power density as high a 2 mW/cm 2 is demonstrated in 1-1.5 g vibration environments. The piezoelectric device is attached on the surface of TE module to capture both the vibration and thermal energy sources to realize dual mode energy harvester. The multi-energy transfer strategy opens opportunities for a future generation of wireless and modular electronic devices. These devices would be useful in powering wearable electronic devices, micro sensor chargers, etc. in extreme environmental conditions using body heat/thermal sources and induced motion/vibrations.

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