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Liu¹, Fan, Liu

¹Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, China. State Key Lab for Rapidly Solidified Non-equilibrium Alloys, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015,

Science (New York, N.Y.)

|November 5, 1999

Resumen

Los nanotubos de carbono de pared única (SWNT) demuestran capacidades prometedoras de almacenamiento de hidrógeno. Los SWNT tratados lograron una absorción de hidrógeno del 4,2 wt% a temperatura ambiente, con una liberación significativa en condiciones ambientales.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Ingeniería Química Ingeniería Química.
Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

El almacenamiento de hidrógeno es fundamental para las tecnologías de energía limpia.
El desarrollo de materiales de almacenamiento de hidrógeno eficientes y seguros sigue siendo un desafío importante.
Los nanotubos de carbono ofrecen propiedades únicas para potenciales aplicaciones de almacenamiento de hidrógeno.

Objetivo del estudio:

Para investigar la capacidad de adsorción de hidrógeno de los nanotubos de carbono de pared única (SWNT).
Para evaluar el efecto del pretratamiento en el rendimiento del almacenamiento de hidrógeno.
Para evaluar las características de liberación de hidrógeno de SWNTs.

Principales métodos:

Síntesis de SWNTs utilizando un método de descarga de arco de hidrógeno semicontinuo.
Experimentos de adsorción de hidrógeno realizados en muestras de SWNT preparadas y pretratadas.
El pretratamiento incluyó remojo con ácido clorhídrico y tratamiento térmico al vacío.
Análisis de liberación de hidrógeno en condiciones ambientales y de calentamiento.

Principales resultados:

Se logró de manera reproducible una capacidad de almacenamiento de hidrógeno de 4,2 por ciento en peso (relación H/C de 0,52).
El rendimiento óptimo se observó para SWNTs pretratados con HCl y tratamiento térmico al vacío.
El almacenamiento se logró a temperatura ambiente y a una presión de ~10 MPa.
El 78,3% del hidrógeno adsorbido se liberó a temperatura ambiente y a presión ambiente.
La liberación de hidrógeno residual requiere el calentamiento de la muestra.

Conclusiones:

Los SWNT pretratados exhiben una prometedora capacidad de almacenamiento de hidrógeno a temperatura ambiente.
La facilidad de producción de SWNT y la absorción reproducible sugieren potencial para aplicaciones prácticas.
Los SWNT muestran potencial como materiales efectivos para sistemas de almacenamiento de hidrógeno.

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