The negative impact of fossil fuels on the environment is driving research on renewable energy. Over the past few decades, researchers have explored efficient renewable energy technologies such as solar photovoltaics, solar fuels, biomass, water (thermal) energy, wind turbines, etc. These renewable technologies show great potential in collecting renewable energy for power generation, contributing to the solution of environmental problems.
However, the high cost, size, impact on aquatic life, and weather dependence of these technologies make their application scenarios unsatisfactory. Thermoelectric technology because of itLightweight, scalable, cost-effective, no moving parts, and miniature and nano devices that can be integrated into heating and cooling power generation applicationsand other advantages, become the ideal choice.
Thermoelectric technology is characterized by a dimensionless quality factor (zT) proportional to the Seebeck coefficient (S) and conductivity (σ) and inversely proportional to the thermal conductivity.The challenge in the study of state-of-the-art thermoelectric materials is the conflict characteristics of the Seebeck coefficient (thermal power) and the σ, resulting in a low power factor (S2σ) and therefore a low quality factor.
Over the years, researchers have reported various techniques to enhance the dimensionless quality factor in metallic thiohydrates thermoelectric materials. Among them, the high power factor of Bi2Te3 material has enabled researchers to see the dawn of commercialization of room temperature applications, but the weakness that Bi2Te3 needs to overcome is itHigh thermal conductivity values。 Therefore, further improvement of the thermoelectric properties of metallic thiohydrates is requiredDecouple S and σ to improve the power factor, thereby increasing the overall efficiency of thermoelectric materials and devices。
Over hereThe team of Professor Ho Chi Man of the City University of Hong Kong made a critical review of equivalent substitution in metallic sulfur materials to improve thermoelectric power generation。 Equivalence substitution can decouple the interdependence of σ and S, synergistically enhancing these two important parameters, both cationic and anionic side substitutions in metalloxosulfide thermoelectric materials have been shown to be effective methods. Equivalent doping can lead to the formation of neutral ions, which helps to rearrange the innermost (core) energy levels located deep in the subject’s atomic valence band because it redistributes electrons within the body’s atoms, thereby changing the position of the electrochemical potential and the density of conduction electrons. This paper also reviews many studies related to the intermediate replacement of metallic thiohydrates in thermoelectric to improve the performance of thermoelectric materials and device applications as current and future research directions.
Figure 1. The study of equivalent doping by cationic and anionic side substitution in metallic sulfur thermoelectric materials has successfully decoupled the contradictory properties of Seebeck coefficients (S), conductivity (σ) and thermal conductivity, and led to simultaneous enhancement of S and σ, thereby improving the quality factor.
J.-D. Musah, A. Ilyas, S. Venkatesh, et al. Isovalent substitution in metal chalcogenide materials for improving thermoelectric power generation – A critical review. Nano Research Energy. https://doi.org/10.26599/NRE.2022.9120034.
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