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Producción de luz visible de hidrógeno por grafeno ablado: ¿descomposición de agua o gasificación de carbono?

Chiara Fasciani¹, Anabel E Lanterna¹, Javier B Giorgi¹

¹Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.

Journal of the American Chemical Society

|July 28, 2017

Resumen

La ablación láser pulsada modifica el óxido de grafeno reducido para la división de agua de luz visible. A diferencia de los láseres pulsados, las fuentes de luz convencionales permiten la división del agua sin gasificación de carbono, produciendo hidrógeno y oxígeno.

Área de la Ciencia:

Ciencias de los materiales
Fotocatálisis
Química ecológica

Sus antecedentes:

El óxido de grafeno es un material prometedor para la fotocatálisis.
La división del agua es un proceso clave para la producción de hidrógeno limpio.
La ablación láser pulsada es un nuevo método para la modificación de materiales.

Objetivo del estudio:

Investigar el efecto de la ablación láser pulsada sobre el óxido de grafeno reducido para la división fotocatalítica del agua.
Para comparar el rendimiento del óxido de grafeno reducido pulsado con láser bajo diferentes fuentes de luz visible.
Comprender las vías de reacción y los subproductos durante la división del agua.

Principales métodos:

Síntesis y caracterización reducida de óxido de grafeno.
Tratamiento de ablación con láser pulsado.
Experimentos de división fotocatalítica del agua bajo luz visible (532 nm) utilizando fuentes de láser pulsado y LED.
Análisis de productos gaseosos (por ejemplo, CO, H2, O2) mediante cromatografía de gases.

Principales resultados:

El óxido de grafeno reducido modificado por ablación láser pulsada divide efectivamente el agua bajo luz visible.
La iluminación láser pulsada dio lugar a la división del agua acompañada de gasificación de carbono (formación de CO).
Sin embargo, las fuentes de luz LED convencionales producen exclusivamente división de agua sin gasificación de carbono.

Conclusiones:

La ablación láser pulsada es un método viable para mejorar la actividad fotocatalítica del óxido de grafeno reducido.
La elección de la fuente de luz influye significativamente en la vía de reacción de escisión del agua y la selectividad del producto.
Este estudio ofrece información sobre el control de los procesos fotocatalíticos para la producción eficiente de hidrógeno y la gestión de subproductos.

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