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Contribuciones pseudocapacitivas al almacenamiento de carga en óxidos de metales de transición del grupo V
Kirstin Brezesinski1, John Wang, Jan Haetge
1Institute of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany.
Journal of the American Chemical Society
|May 4, 2010
Resumen
Se sintetizaron películas de óxido de metal de transición mesoporoso altamente ordenadas utilizando copolímeros de bloque. Estos materiales exhiben propiedades electroquímicas superiores para aplicaciones de almacenamiento de energía.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- La electroquímica es electroquímica.
Sus antecedentes:
- Los copolímeros de bloque anfifílico sirven como plantillas efectivas para crear nanoestructuras inorgánicas periódicas.
- El desarrollo de materiales mesoporosos ordenados con orientación cristalográfica controlada es crucial para aplicaciones avanzadas.
Objetivo del estudio:
- Para sintetizar y caracterizar películas delgadas de óxido de niobio (TaNbO5), óxido de niobio (Nb2O5) y óxido de tántalo (Ta2O5) de tantalo mesoporoso altamente ordenado.
- Investigar las propiedades electroquímicas, en particular el almacenamiento de carga pseudocapacitivo, de estos nuevos materiales mesoporosos.
Principales métodos:
- Coensamblaje de precursores inorgánicos de sol-gel con un copolímero de dibloqueo de poli (etilen-co-butileno) -b-poli (óxido de etileno) (KLE).
- Tratamiento térmico para inducir la cristalización y formar arquitecturas sólidas porosas cúbicas ordenadas.
- Caracterización de la alineación cristalográfica y la estructura mesoporosa en varios sustratos.
Principales resultados:
- Fabricó con éxito películas delgadas mesoporosas altamente cristalinas T-Nb2O5, L-Ta2O5 y TaNbO5 con arquitectura sólida porosa cúbica ordenada.
- Logró una alta alineación cristalográfica en diversos sustratos, superando las limitaciones de la epitaxia tradicional.
- Las películas mesoporosas de Nb2O5 demostraron un almacenamiento de carga pseudocapacitativo significativamente mejorado en comparación con sus contrapartes amorfas.
Conclusiones:
- El método de síntesis permite la producción de óxidos de metales de transición mesoporosos orientados con propiedades sintonizables.
- La combinación única de mesoporosidad y orientación cristalográfica aumenta significativamente el rendimiento electroquímico, en particular la pseudocapacitancia de intercalación.
- Estos materiales son prometedores para dispositivos de almacenamiento de energía de alto rendimiento.
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