Flexible power generators by Ag2Se thin films with record-high thermoelectric performance

Yang, Dong; Shi, Xiao-Lei; Li, Meng; Nisar, Mohammad; Mansoor, Adil; Chen, Shuo; Chen, Yuexing; Li, Fu; Ma, Hongli; Liang, Guang Xing; Zhang, Xianghua; Liu, Weidi; Fan, Ping; Zheng, Zhuanghao; Chen, Zhi-Gang

doi:10.1038/s41467-024-45092-7

Cited by 67 publications

(9 citation statements)

References 47 publications

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“…As a comparison, the formation of Ni 1– x Se was observed at the Ag 2 Se/Ni interface and FeSe was observed at the Ag 2 Se/Fe interface, while Cu diffused severely into Ag 2 Se (Figures S16 and S17 of the Supporting Information). The electrical contact resistance ( R c ) of Ag/Ag 2 Se is estimated to be ∼0.3 mΩ (Figure b), corresponding to an interfacial contact resistivity (ρ c ) of only ∼11 μΩ cm 2 , which is comparable to the lowest ever reported in Ag 2 Se-based devices and is sufficiently low compared to results reported in devices ,,,− using other thermoelectric materials (Figure c). As a result of the interphases formed, the ρ c values of Ni/Ag 2 Se and Fe/Ag 2 Se are ∼21 and ∼27 μΩ cm 2 , respectively, higher than that of Ag/Ag 2 Se.…”

Section: Resultsmentioning

confidence: 57%

Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C

Liu,

Zhang,

Ding

et al. 2024

ACS Appl. Mater. Interfaces

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Thermoelectricity has been considered as the most important solution of generating electricity, particularly from low-grade heat below 300 °C. Despite efforts in recent years on exploring alternative materials to only commercialized Bi 2 Te 3 , the practical implementation of these new materials has been hindered by inadequate investigation into device design. Given that the utilization of weldable electrodes offers advantages in technical compatibility for a large-scale assembly of thermoelectric elements into modules, a thorough investigation into the potential of weldable metal electrodes at T < 300 °C is imperative. In this work, the diffusion of 11 kinds of thermoelectric materials in common weldable metals (Ni, Fe, Cu, and Ag) was screened. Ag is sorted out as a promising weldable electrode that can directly bond to thermoelectric Ag 2 Se in this temperature range, leading to a minimization of an interfacial contact resistivity down to 11 μΩ cm 2 in a design of the Ag/Ag 2 Se/Ag structure. The conversion efficiency of ∼3% at ΔT of 95 K with an excellent stability indicates Ag 2 Se as a top alternative to n-type Bi 2 Te 3 for low-grade heat recovery.

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Section: Resultsmentioning

confidence: 57%

Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C

Liu,

Zhang,

Ding

et al. 2024

ACS Appl. Mater. Interfaces

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“…Therefore, depositing inorganic materials on flexible substrates is another way of achieving flexible thermoelectric thin films. Among inorganic thermoelectric thin films, Bi 2 Te 3 13 , 14 , as well as silver chalcogenides such as Ag 2 Se 15 , 16 , have exhibited excellent near-room-temperature ZT values ( ZT > 1 at 400 K). However, the reported inorganic flexible thermoelectric thin films are currently limited to functionalities near room temperature 10 .…”

Section: Introductionmentioning

confidence: 99%

High-performance flexible p-type Ce-filled Fe3CoSb12 skutterudite thin film for medium-to-high-temperature applications

Li,

Shi,

Zhu

et al. 2024

Nat Commun

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P-type Fe3CoSb12-based skutterudite thin films are successfully fabricated, exhibiting high thermoelectric performance, stability, and flexibility at medium-to-high temperatures, based on preparing custom target materials and employing advanced pulsed laser deposition techniques to address the bonding challenge between the thin films and high-temperature flexible polyimide substrates. Through the optimization of fabrication processing and nominal doping concentration of Ce, the thin films show a power factor of >100 μW m−1 K−2 and a ZT close to 0.6 at 653 K. After >2000 bending cycle tests at a radius of 4 mm, only a 6 % change in resistivity can be observed. Additionally, the assembled p-type Fe3CoSb12-based flexible device exhibits a power density of 135.7 µW cm−2 under a temperature difference of 100 K with the hot side at 623 K. This work fills a gap in the realization of flexible thermoelectric devices in the medium-to-high-temperature range and holds significant practical application value.

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“…However, the inherent crystal structure of Bi 2 Te 3 imparts poor flexibility and the relatively low natural abundance of tellurium (Te) contributes to cost inefficiency. Consequently, there is a pressing need for the development of alternative inorganic thermoelectric thin films that can overcome the flexibility limitations and the cost concerns associated with Bi 2 Te 3 -based materials [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

Nasiri,

Tong,

Cho

et al. 2024

Materials

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In this study, we have improved the power factor of conductive polymer nanocomposites by combining layer-by-layer assembly with electrochemical deposition to produce flexible thermoelectric materials based on PEDOT/carbon nanotubes (CNTs)—films. To produce films based on CNTs and PEDOT, a dual approach has been employed: (i) the layer-by-layer method has been utilized for constructing the CNTs layer and (ii) electrochemical polymerization has been used in the synthesis of the conducting polymer. Moreover, the thermoelectric properties were optimized by controlling the experimental conditions including the number of deposition cycles and electropolymerizing time. The electrical characterization of the samples was carried out by measuring the Seebeck voltage produced under a small temperature difference and by measuring the electrical conductivity using the four-point probe method. The resulting values of the Seebeck coefficient S and σ were used to determine the power factor. The structural and morphological analyses of CNTs/PEDOT samples were carried out using scanning electron microscopy (SEM) and Raman spectroscopy. The best power factor achieved was 131.1 (μWm−1K−2), a competitive value comparable to some inorganic thermoelectric materials. Since the synthesis of the CNT/PEDOT layers is rather simple and the ingredients used are relatively inexpensive and environmentally friendly, the proposed nanocomposites are a very interesting approach as an application for recycling heat waste.

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Flexible power generators by Ag2Se thin films with record-high thermoelectric performance

Cited by 67 publications

References 47 publications

Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C

Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C

High-performance flexible p-type Ce-filled Fe3CoSb12 skutterudite thin film for medium-to-high-temperature applications

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

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Flexible power generators by Ag2Se thin films with record-high thermoelectric performance

Cited by 67 publications

References 47 publications

Screening Weldable Metal Electrodes for Ag2Se Thermoelectric Devices below 300 °C

Screening Weldable Metal Electrodes for Ag2Se Thermoelectric Devices below 300 °C

High-performance flexible p-type Ce-filled Fe3CoSb12 skutterudite thin film for medium-to-high-temperature applications

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

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Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C

Screening Weldable Metal Electrodes for Ag₂Se Thermoelectric Devices below 300 °C