Innovative Thermoelectric Materials

Influence of the chemical structure of diisocyanate on the electrical and thermal properties of in situ polymerized polyurethane–graphene composite films

“…Eqn (2) calculates the Seebeck coefficient as follows:Δ V = α Δ T where α , Δ V and Δ T are the Seebeck coefficient, the potential (voltage), and the temperature difference of two ends of the films respectively. 62,63…”

Polyethylene Glycol as Additive to Achieve N-Conductive Melt-Mixed Polymer/Carbon Nanotube Composites for Thermoelectric Application

“…One way to achieve this is the application of thermoelectrics (TEs) using the Seebeck effect. In this approach, a thermoelectric voltage is generated from a temperature gradient acting on a conductive material, which can serve as an energy source for various low-energy applications, such as wireless sensors for the Internet of Things [ 1 , 2 , 3 ]. In order to characterize the thermoelectric properties, the Seebeck coefficient (S) is calculated, which represents the ratio between the thermoelectric voltage (U) generated and the applied temperature difference (dT).…”

Wearable Thermoelectric Devices Based on Three-Dimensional PEDOT:Tosylate/CuI Paper Composites

“…The power output of a wearable thermoelectric device is affected by the following factors: (a) the thermoelectric figure of merit, ZT , or the power factor of the p- and n-type thermoelectric elements, (b) the number of p- and n-type elements used in a complete thermoelectric device, (c) the temperature difference across the hot and cold sides of the device, (d) the dimensions of p - and n -type thermoelectric elements (especially the distance between the hot and cold sides), and (e) the use of heat-dissipating elements (e.g., copper foils or fins). , The majority of the previous research efforts in the field of organic thermoelectrics have focused mainly on maximizing the power factor of the thermoelectric materials, and limited attention has been given to the geometry of the device to maximize the thermoelectric performance. − For example, several studies have developed two-dimensional (2D) thin films of thermoelectric materials on a substrate and have prepared proof-of-concept complete thermoelectric devices using strips of these thermoelectric materials. − By design, the cold and hot sides of these devices are a few centimeters apart that has a detrimental impact on the power output as a large portion of the power that is produced by the thermoelectric device is lost inside the device because of the internal resistance of the thermoelectric elements. Some other studies have proposed the use of organic thermoelectric materials that are printed on a substrate to form micrometer-tall thermoelectric pillars − or they have used a thin layer of organic thermoelectric material .…”