Ultrahigh Power Factor of Ternary Composites with Abundant Se Nanowires for Thermoelectric Application

Abstract

In this work, ultrahigh-performance single-walled carbon nanotube (SWCNT)/Se nanowire (NW)/poly­(3,4-ethylenedioxythiophene):poly­(4-styrenesulfonate) (PEDOT:PSS) ternary thermoelectric (TE) nanocomposite films are successfully designed by rational design of CNT/Se/PEDOT:PSS ternary nanocomposites. The addition of CNTs apparently improves the electrical conductivity of composite films, resulting in a relatively huge growth of the power factor. The PEDOT:PSS interface layers uniformly attach on both sides of the Se NWs and CNTs effectively, forming a tightly interleaving and interconnected three-dimensional network. As a consequence, a maximum power factor of 863.83 μW/(m·K2) has been achieved for the sample containing 26 wt % CNTs at 434 K. Ultimately, a flexible TE generator prototype consisting of 5-unit freestanding composite film strips is fabricated using the optimized composite films, which can generate a maximum output power of 206.8 nW at a temperature gradient of 44.7 K. Therefore, the present work has a further potential to be used for the flexible polymer/carbon TE nanocomposite films and devices.

Improved Thermoelectric Properties of Selenium Functionalized Pedot

“…Furthermore, compared to the peak position for PEDOT at 1442 cm −1 , the comparable peaks for the composites are initially displaced to the lower wavenumber till 20 % and then displaced to a higher wavenumber of 1449 cm −1 for 82 %. Thus, due to the Se loading pattern, the polymer chain lengthens in all samples, as seen by the shift change [32] …”

“…Thus, due to the Se loading pattern, the polymer chain lengthens in all samples, as seen by the shift change. [32] Figure 5 shows FESEM images of pure PEDOT and composites with different Se nanoparticle contents. Flake like structures with stacked layers is observed for PEDOT.…”

Recent Advances in Multicomponent Organic Composite Thermoelectric Materials

“…Moreover, because the work functions of the three materials were very close, the formed interface energy barrier could hinder the carriers with lower energy, thereby improving the thermoelectric properties of the ternary material, so that the maximum PF at 434 K was 863.8 µW m −1 K −2 . [45] The thermoelectric properties of multicomponent films were closely related to the weight ratio between the components. Liang et al prepared PEDOT-tosylate (Tos)/SWCNTs/Te multicomponent thin films whose properties were highly dependent on the dispersion of SWCNTs and the weight ratio of the components.…”

Polyaniline/SWCNT composite films prepared via the solvent-induced strategy for flexible energy harvesting

“…TEGs have been considered semi-permanent energy suppliers, and are therefore signicant for the Internet of Things (IoT) era and the new energy revolution. [1][2][3][4][5][6][7][8][9] The efficiency of TE materials is evaluated using the dimensionless gure of merit, ZT = S 2 sTk −1 , where S is the Seebeck coefficient, s is electrical conductivity, k is thermal conductivity, and T is the absolute temperature. For conductive polymer materials with low thermal conductivity, the TE performance is mainly characterized using the power factor PF = S 2 s.…”