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Nanotubos de carbono anclados con V2O5 para el almacenamiento de energía electroquímica mejorada
M Sathiya1, A S Prakash, K Ramesha
1CSIR Central Electrochemical Research Institute-Chennai Unit, CSIR-Madras Complex, Taramani, Chennai-600 113, India.
Journal of the American Chemical Society
|September 6, 2011
Resumen
Este estudio desarrolló un pentoxido de vanadio (V2O5) recubierto en un compuesto de nanotubos de carbono (CNT) para el almacenamiento de energía de alto rendimiento. El material V2O5/CNTs demuestra contribuciones capacitivas significativas, mejorando la capacidad de la batería de iones de litio.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los nanotubos de carbono multipared funcionalizados (CNT) ofrecen una alta conductividad y área de superficie.
- El pentóxido de vanadio (V2O5) es un material de cátodo prometedor para baterías de iones de litio.
- El diseño de materiales compuestos puede mejorar el rendimiento electroquímico.
Objetivo del estudio:
- Para sintetizar y caracterizar un compuesto V2O5/CNT para aplicaciones electroquímicas.
- Investigar la actividad electroquímica y las contribuciones de capacidad del compuesto V2O5/CNT con iones de litio.
- Para evaluar el potencial de este compuesto para electrodos supercondensadores de alto rendimiento.
Principales métodos:
- Hidrólisis controlada de alcóxido de vanadio para recubrir CNTs con una fina capa de V2O5.
- Pruebas electroquímicas del compuesto V2O5/CNT para la actividad de iones de litio.
- Análisis utilizando gráficos de Trasatti y espectroscopia de fotoelectrones de rayos X (XPS).
Principales resultados:
- El compuesto V2O5/CNT exhibe contribuciones de capacidad tanto faradaicas como capacitivas.
- A una velocidad alta (1 C), el comportamiento capacitivo representa 2/3 de la capacidad total (2700 C/g).
- XPS confirmó el 85% de vanadio en el estado de oxidación +4 después de la descarga, consistente con las contribuciones capacitivas.
Conclusiones:
- El nano V2O5/CNTs compuesto ofrece una corta trayectoria de difusión para Li(+) -iones y fácil acceso a los centros redox de vanadio.
- La alta conductividad de las CNT mejora el rendimiento electroquímico general.
- La arquitectura compuesta demuestra una alta potencia y densidad de energía, adecuada para electrodos supercondensadores avanzados.
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