Effect of material anisotropy on the transverse thermoelectricity of layered composites

Abstract

Summary Thermoelectric devices can achieve conversion between thermal and electrical energies. In contrast to longitudinal thermoelectrics, transverse thermoelectrics can decouple the directions of heat flux and electric current, which in turn offers more flexibility in device design. While many studies have focused on composite structures constructed using materials with isotropic properties, this work investigated the effect of material anisotropy on the transverse thermoelectricity of layered composite materials. A simplified analytical model was derived based on the equivalent circuit principle to correlate the effective thermoelectric properties of the composite structure and the properties of the constituting phases. The effects of the geometrical design parameters of the composite structure and the material anisotropy were investigated. The transverse thermoelectric figure of merit increases with the increase in material anisotropy. The analytical model was then compared with the finite element analysis model with respect to the cooling capacity of transverse thermoelectric devices. The good agreement achieved between the two approaches indicated the effectiveness of the simplified analytical model in predicting the transverse thermoelectric performance of layered structures with anisotropic material properties.

Pressurized Alloying Assisted Synthesis of High Quality Antimonene for Capacitive Deionization

“…The ex situ XRD patterns of the antimonene‐PAE electrode during the charge/discharge process show unchanged diffraction peaks (Figure S13, Supporting Information), indicating a double‐layer capacitance, rather than pseudocapacitance. [ 20 ] Significantly, as the scanning rate increases, the specific capacitance of antimonene‐PAE decreases less than that of bulk Sb and Antimonene‐LPE (Figure 5f), and is always higher than that of bulk Sb and Antimonene‐LPE, which can be ascribed to the ultra‐thin and large‐sized antimonene increasing the contact area of electrode/electrolyte and shortening the diffusion distance of Na + .…”

Enhanced Thermoelectric Cooling through Introduction of Material Anisotropy in Transverse Thermoelectric Composites

“…While the fibrous transverse thermoelectric composite can be treated as a 1D inclusion composite, the layered transverse thermoelectric composite can be treated as a 2D inclusion composite. The cooling capacity of the layered transverse thermoelectric composites with anisotropic components have been investigated thoroughly in previous studies [21]. Hence, it is informative to compare the cooling performances of transverse thermoelectric composites between 1D and 2D inclusion composites.…”

“…However, many studies have already shown that thermoelectric materials can exhibit anisotropic properties, such as Bi 2 Te 3 [5,17], SnSe [18], and organic thermoelectric PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) [19,20], etc. As a result, anisotropic material properties were applied into the component phase of layered transverse thermoelectric composites, and the results showed that the maximum Z trans T could be improved by introducing material anisotropy in a polycrystal [21]. However, the effect of material anisotropy on fibrous composite still remains unknown.…”

High Electrosorption Capacity of Uranium (VI) by Carboxylic Acid Functionaliszed N, P Co-Doped Carbon Materials

“…So far, many kinds of carbon materials have been used as electrodes in electrosorption, such as activated carbon, [19][20][21] carbon aerogels, [22][23][24] carbon nanotubes, [25][26][27] graphene [28][29][30] and so on. Xu et al 15 first used continuous polymeric fibers as templates to synthetize the derived nitrogen-iron-doped carbon tubes (3D-FeNC tubes).…”