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C₆₀-Nanotubos de carbono adsorbidos de pared única como catalizadores sin metales, universales en pH y

Rui Gao^1,2, Quanbin Dai¹, Feng Du¹

¹Center of Advanced Science and Engineering for Carbon (Case4Carbon), Department of Macromolecular Sciences and Engineering , Case Western Reserve University , Cleveland , Ohio 44106 , United States.

Journal of the American Chemical Society

|June 27, 2019

Resumen

Los nuevos electrocatalizadores libres de metales hechos de buckminsterfullereno (C60) y nanotubos de carbono de pared única (SWCNT) muestran una excelente actividad trifuncional para las reacciones de oxígeno e hidrógeno en todos los niveles de pH.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Nanotecnología

Sus antecedentes:

El desarrollo de electrocatalizadores eficientes y libres de metales es crucial para las tecnologías de energía sostenible.
Los materiales a base de carbono ofrecen un potencial debido a sus propiedades electrónicas y estabilidad únicas.
Los catalizadores existentes a menudo sufren de un rango de pH limitado o dependen de los metales preciosos.

Objetivo del estudio:

Sintetizar y caracterizar nuevos electrocatalizadores sin metales basados en compuestos C60-SWCNT.
Investigar la actividad catalítica trifuncional de estos materiales para la reducción del oxígeno (ORR), la evolución del oxígeno (OER) y la evolución del hidrógeno (HER).
Evaluar el rendimiento y la estabilidad de los catalizadores C60-SWCNT en un amplio rango de pH.

Principales métodos:

Adsorción del buckminsterfullereno (C60) en los nanotubos de carbono de pared única (SWCNT).
Inducción de la transferencia de carga intermolecular entre el C60 y los SWCNT.
Caracterización electroquímica de los compuestos C60-SWCNT para ORR, OER y HER.
Evaluación del rendimiento en condiciones ácidas, neutrales y alcalinas.

Principales resultados:

Se han desarrollado con éxito electrocatalizadores C60-SWCNT libres de metales que presentan actividad trifuncional.
Se han demostrado altas actividades electrocatalíticas para ORR, OER y HER.
Logró un rendimiento superior y una estabilidad a largo plazo en comparación con los catalizadores comerciales de platino (Pt) y dióxido de rutenio (RuO2).
Se ha demostrado el comportamiento catalítico de pH universal de los medios ácidos a los alcalinos.

Conclusiones:

La transferencia de carga intermolecular inducida por adsorción es una estrategia efectiva para crear electrocatalizadores basados en carbono de alto rendimiento y sin metales.
El sistema C60-SWCNT representa una plataforma prometedora para la electrocatálisis trifuncional en la división de agua y otras aplicaciones energéticas.
Este enfoque ofrece una vía general hacia el desarrollo de electrocatalizadores sostenibles, libres de metales y de pH universal.

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