Ag2S(1-x)Sex Thermoelectric Material Low-Temperature ZT Optimization
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Solution Overview
Problem
Existing thermoelectric conversion materials struggle to achieve high efficiency in converting heat to electric energy at low temperatures, as indicated by the dimensionless figure of merit ZT, which is crucial for efficient power generation without waste discharge and in various operating environments.
Innovation Solution
A thermoelectric conversion material represented by the composition formula Ag2S(1-x)Sex, where x is between 0.2 and 0.95, is developed to maximize ZT in a low temperature range, enhancing conversion efficiency by optimizing the Seebeck coefficient and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermoelectric conversion materials are used, then they can operate at high temperatures, but they fail to achieve high conversion efficiency at low temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the thermoelectric material by introducing multiple dopants (Cu, Al, Ga, In, Zn, Ge, Sn, Pb, Bi) into the Ag2Se base material. By adjusting the doping concentrations and ratios, the electrical conductivity and Seebeck coefficient are optimized to achieve high ZT values at low temperatures while maintaining operational stability across a wide temperature range.
Solution Approach 2:
The patent creates a composite thermoelectric material system combining Ag2Se with multiple dopant elements. This composite approach allows synergistic effects where different dopants contribute to optimizing various properties: some enhance electrical conductivity, others improve Seebeck coefficient, and the combination achieves superior low-temperature conversion efficiency compared to single-element materials.
2Use of energy by moving object
If the composition of thermoelectric material is optimized for low temperature operation, then conversion efficiency improves, but the material may lose stability or performance at higher temperatures
Solution Approach 1:
The patent applies local quality by creating regions with different dopant concentrations within the thermoelectric material. By strategically distributing dopants with different properties throughout the material structure, it achieves optimized performance at the operating temperature while maintaining compositional stability across broader temperature ranges through gradual property transitions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The material achieves high thermoelectric conversion efficiency and sensitivity in a low temperature range, such as room temperature, by maximizing ZT, enabling effective power generation and sensor performance.
Implementation Method 1
heat is directly converted into electric power... efficiency η in converting a temperature difference (heat energy) into electric energy using a material (thermoelectric conversion material) for thermoelectric conversion
Data Source
AI summary
A thermoelectric conversion material is represented by a composition formula Ag2S(1-x)Sex. The value of x is not smaller than 0.2 and not greater than 0.95.