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Almacenamiento de carga de alta capacidad en marcos orgánicos covalentes
Zhengnan Tian1, Vinayak S Kale2, Yizhou Wang1
1Materials Science and Engineering, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Journal of the American Chemical Society
|November 5, 2021
Resumen
Las estructuras orgánicas covalentes (COF) utilizan la química de enlaces de hidrógeno para el almacenamiento eficiente de iones de amonio (NH4+) en baterías acuosas. Este nuevo enfoque supera las limitaciones de los materiales inorgánicos, permitiendo una alta capacidad y una cinética mejorada para aplicaciones de almacenamiento de energía.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Almacenamiento de energía
Sus antecedentes:
- Los iones de amonio (NH4+) son portadores de carga no metálicos prometedores para las baterías acuosas.
- Los materiales huéspedes inorgánicos enfrentan desafíos debido a la cinética de difusión iónica lenta.
- Los marcos orgánicos covalentes (COF) ofrecen potencial para aplicaciones avanzadas de baterías.
Objetivo del estudio:
- Explorar el uso de la química de enlaces de hidrógeno en los COF para el almacenamiento de iones NH4+.
- Investigar el mecanismo de almacenamiento de NH4+ en los FOC.
- Establecer una relación entre la solvación iónica y el rendimiento electroquímico.
Principales métodos:
- Síntesis y caracterización de los COF para el almacenamiento de iones NH4+.
- Pruebas electroquímicas para determinar la capacidad y la cinética.
- Simulaciones teóricas y análisis de materiales para elucidar los mecanismos de reacción.
Principales resultados:
- Se obtiene una alta capacidad de 220,4 mAh g-1 a 0,5 A g-1 utilizando COF.
- Reveló un mecanismo universal que involucra sitios de nitrógeno y oxígeno enlazados con hidrógeno.
- Se estableció una correlación entre el comportamiento de disolución de NH4+, el potencial redox y la energía de disolución.
Conclusiones:
- La química del enlace de hidrógeno en los COF proporciona una estrategia efectiva para el almacenamiento de iones NH4+.
- El mecanismo aclarado ofrece nuevos conocimientos para el diseño de materiales de acogida avanzados.
- Este enfoque puede guiar el desarrollo de COF para el almacenamiento de energía electroquímica de próxima generación.
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