Bi2S3 as a Promising ThermoelectricMaterial:Back and Forth

Abstract

Thermoelectric conversion technology based on thermoelectric materials can directly convert heatandelectricity and is extensively used in waste heat recovery, semiconductor refrigeration, and spaceexploration.Currently, bismuth telluride (Bi2Te3) thermoelectric materials are the best in terms of room-temperatureperformance and have been commercialized. Compared with commercial Bi2Te3 thermoelectricmaterialsofthe same family (III-VI group), bismuth sulfide (Bi2S3) thermoelectric materials have the uniqueadvantagesof being abundant, low-cost, and environmentally friendly. However, the thermoelectric propertiesofBi2S3are limited by its low electrical conductivity. In recent years, with the development of preparationmethodsand characterization tools, many studies have emerged to improve the thermoelectric propertiesofBi2S3materials. Herein, the preparation of Bi2S3 thermoelectric materials and the implications of theprocessontheir thermoelectric properties are summarized. The advances made in composition, structureandotherstrategies to optimize the thermoelectric properties of Bi2S3 are highlighted, and the current challengesforthe development of Bi2S3 thermoelectric materials and potential future research directions are alsodiscussed.Keywords: Bi2S3, thermoelectric, nanorods, electrical conductivity

Band-Structure Modification Leads to Enhanced Thermoelectric Performance of Bi2S3 by CaCl2 Doping

“…So, the conductivity can be enhanced by tuning the carrier concentration. It is found that electrical resistivity can be reduced by fabricating a nonstoichiometric sample . Zhao et al obtained a maximum ZT value of ∼0.11 by texturing the sample using the hot-pressing method .…”

“…It is found that electrical resistivity can be reduced by fabricating a nonstoichiometric sample. 15 Zhao et al obtained a maximum ZT value of ∼0.11 by texturing the sample using the hot-pressing method. 16 Further researchers have used the strategy of chemical doping to increase the electrical conductivity of bulk Bi 2 S 3 by using Ag, Cu, I, 17,18 etc.…”

Synthesis of SnSe1–xSx Polycrystals with Enhanced Thermoelectric Properties Via Hydrothermal Methods Combined with Spark Plasma Sintering

“…Thermoelectric (TE) materials are regarded as the most promising new clean energy sources, which can effectively ameliorate the greenhouse effect and the earth’s environment. − The conversion between heat energy and electric energy can be realized directly through thermoelectric materials , that do not release any hazardous gaseous chemical residues. , The thermoelectric component is a mechanically reliable, stable environment of the electric device, with no operating mechanical vibration and noise. , To apply thermoelectric materials in the future, the key problem is improving the conversion efficiency. The thermoelectric properties are determined by a dimensionless figure of merit ( ZT ), which is defined as ZT = S 2 σ T /κ t , where S is the Seebeck coefficient, σ is the electrical conductivity, S 2 σ is the power factor (PF), T is the absolute temperature, and κ t is the total thermal conductivity, which consists of the lattice thermal conductivity (κ l ) and the electron thermal conductivity (κ e ) …”

“…Thermoelectric (TE) materials are regarded as the most promising new clean energy sources, which can effectively ameliorate the greenhouse effect and the earth's environment. 1−4 The conversion between heat energy and electric energy can be realized directly through thermoelectric materials 5,6 that do not release any hazardous gaseous chemical residues. 7,8 The thermoelectric component is a mechanically reliable, stable environment of the electric device, with no operating mechanical vibration and noise.…”