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Alta conductividad de protones anidrosos de los poliimidas mesoporosos cargados de imidazol en un amplio rango de
Yingxiang Ye1, Liuqin Zhang, Qinfang Peng
1College of Chemistry and Chemical Engineering, Fujian Provincial Key Laboratory of Polymer Materials, Fujian Normal University , 32 Shangsan Road, Fuzhou 350007, China.
Journal of the American Chemical Society
|January 1, 2015
Resumen
Las nuevas poliimidas cargadas de imidazol ofrecen una alta conductividad de protones anidrosos para pilas de combustible en un amplio rango de temperaturas, de -40 a 90 °C, superando las limitaciones de los materiales actuales.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- Ingeniería Química Ingeniería Química.
Sus antecedentes:
- La tecnología de celdas de combustible exige conductores de protones con conductividad estable a varias temperaturas, incluidas las condiciones bajo cero para el arranque.
- Los conductores de protones existentes a menudo se degradan a altas temperaturas (>80 °C) o se congelan a bajas temperaturas (<-5 °C).
Objetivo del estudio:
- Desarrollar nuevos materiales conductores de protones con alta conductividad anidra en un amplio rango de temperaturas (-40 a 90 °C).
- Abordar las limitaciones de los materiales actuales susceptibles a la degradación térmica y la congelación.
Principales métodos:
- Síntesis de poliimidas tetraédricos cargados de imidazol con estructuras mesoporosas (Im@Td-PNDI 1 y Im@Td-PPI 2).
- Evaluación de la conductividad del protón anhidro a través de un amplio espectro de temperaturas, incluyendo condiciones bajo cero y elevadas.
Principales resultados:
- Im@Td-PNDI 1 e Im@Td-PPI 2 demostraron una alta conductividad de protones anidrosos desde -40 hasta 90 °C.
- El material 2 exhibió una conductividad superior por debajo de 40 °C en comparación con otros conductores anhídridos.
- La conductividad del material 2 por encima de 40 °C fue comparable a los materiales de última generación como His@[Al(OH)(1,4-ndc)]n y [Zn3(H2PO4)6(H2O)3](Hbim).
Conclusiones:
- Las poliimidas tetraédricas cargadas de imidazol ofrecen una excelente estabilidad térmica y congelación-deshielo.
- Estos materiales muestran una promesa significativa como conductores de protones anhidros para aplicaciones de celdas de combustible en diversas condiciones climáticas.
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