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Calcogenidos estabilizados por alta entropía con un alto rendimiento termoeléctrico
Binbin Jiang1, Yong Yu1,2, Juan Cui1
1Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
Science (New York, N.Y.)
|February 19, 2021
Resumen
Los investigadores aumentaron el rendimiento de los materiales termoeléctricos utilizando aleaciones de alta entropía. Este enfoque de ingeniería de entropía mejoró la cifra de mérito (zT) a 1,8, mejorando la generación de electricidad a partir del calor residual.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- Conversión de energía
Sus antecedentes:
- La tecnología termoeléctrica ofrece una vía prometedora para convertir el calor residual en electricidad.
- La adopción generalizada de dispositivos termoeléctricos se ve obstaculizada por el rendimiento limitado de los materiales termoeléctricos existentes.
- El ajuste de las propiedades del material a través de la entropía configuracional presenta una estrategia para superar estas limitaciones.
Objetivo del estudio:
- Mejorar el valor termoeléctrico (zT) de los materiales a base de selenuro de plomo (PbSe).
- Explorar el potencial de los materiales de alta entropía para mejorar el rendimiento termoeléctrico.
- Demostrar un nuevo enfoque para optimizar los materiales termoeléctricos a través de la ingeniería de la entropía.
Principales métodos:
- Sintetizó un material de alta entropía basado en PbSe de tipo n.
- Utilizó estabilización estructural impulsada por la entropía para formar el material.
- Investigó las propiedades estructurales y térmicas del material, centrándose en las distorsiones de la celosía y la dispersión de fonones.
Principales resultados:
- Logró una cifra de mérito (zT) de 1,8 a 900 Kelvin.
- Se observó una reducción significativa de la conductividad térmica de la celosía debido a las tensiones de corte inusuales de las celosías distorsionadas.
- Se ha demostrado una eficiencia de conversión termoeléctrica del 12,3% para un módulo segmentado con una diferencia de temperatura (ΔT) de 507 Kelvin.
Conclusiones:
- La ingeniería de entropía es una estrategia efectiva para desarrollar materiales termoeléctricos de alto rendimiento.
- Los materiales de alta entropía exhiben características estructurales únicas que benefician las propiedades termoeléctricas.
- Este trabajo establece un nuevo paradigma para el avance de la tecnología termoeléctrica a través del diseño de materiales avanzados.
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