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Małgorzata Knapik¹, Wojciech Zając², Agnieszka Wojteczko¹

¹Faculty of Materials Science and Ceramics, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow, Poland.

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Resumen

Este estudio muestra que la estructura de las nanopartículas de vanadato de bismuto (BiVO4) en los fotoánodos de dióxido de titanio (TiO2) impacta significativamente la absorción de luz ultravioleta y visible y la separación de carga para mejorar el rendimiento fotoelectroquímico.

Palabras clave:

SILAR heteroestructuras de TiO2@BiVO4 drop-casting fotoánodos oxidación de agua

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Área de la Ciencia:

Ciencia de Materiales
Nanotecnología
Fotoquímica

Sus antecedentes:

El dióxido de titanio (TiO2) es un semiconductor ampliamente estudiado para fotoánodos.
El vanadato de bismuto (BiVO4) es un material prometedor para la absorción de luz visible.
Las heteroestructuras de TiO2/BiVO4 ofrecen potencial para mejorar el rendimiento fotoelectroquímico.

Objetivo del estudio:

Investigar el efecto de la cantidad y forma de las nanopartículas de BiVO4 en los fotoánodos de TiO2.
Comprender la influencia de la temperatura de recocido en la fase y las propiedades ópticas del BiVO4.
Correlacionar la morfología del fotoánodo con la respuesta de la fotocorriente bajo luz UV y visible.

Principales métodos:

Preparación y recocido de nanopartículas de BiVO4 a varias temperaturas (200–500 °C).
Deposición de BiVO4 sobre TiO2 nanoestructurado mediante drop-casting y adsorción y reacción iónica sucesiva (SILAR).
Caracterización estructural, óptica y fotoelectroquímica de las heteroestructuras de TiO2/BiVO4.

Principales resultados:

La temperatura de recocido influye en la transición de fase del BiVO4 y la absorción de luz visible.
La morfología del BiVO4 sobre el TiO2 afecta la respuesta de la fotocorriente bajo luz UV y visible.
El fotoánodo TiO2@d mostró una alta actividad relativa de luz visible pero sufrió pérdidas de transporte.

Conclusiones:

La presencia de nanopartículas de BiVO4 sobre TiO2 influye significativamente en la separación de carga y la utilización de fotones.
La optimización de la morfología del BiVO4 es crucial para una transferencia de carga eficiente y una reducción de la recombinación.
Comprender la alineación de bandas y los mecanismos de transferencia de carga en las heteroestructuras de TiO2/BiVO4 es clave para el rendimiento del dispositivo.