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La división del agua impulsada por la luz visible en un dispositivo molecular con una densidad de fotocorriente sin
Yan Gao1, Xin Ding, Jianhui Liu
1State Key Laboratory of Fine Chemicals, Dalian University of Technology, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian 116024, China. dr.gaoyan@dlut.edu.cn
Journal of the American Chemical Society
|March 8, 2013
Resumen
Los investigadores desarrollaron un nuevo fotoánodo para la división eficiente del agua solar. Este catalizador molecular y sistema de fotosensibilizador en nanopartículas de TiO2 logra una densidad de fotocorriente récord, lo que promueve la producción sostenible de hidrógeno.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- La fotocatálisis por fotocatálisis.
Sus antecedentes:
- La división eficiente del agua es crucial para la producción sostenible de combustible de hidrógeno.
- Los catalizadores moleculares ofrecen propiedades sintonizables para la oxidación del agua.
- La integración de componentes moleculares con soportes de semiconductores mejora el rendimiento fotoelectroquímico.
Objetivo del estudio:
- Para sintetizar e inmovilizar un catalizador de oxidación de agua molecular y un fotosensibilizador en TiO2 nanoestructurado.
- Para construir un ánodo fotoactivo para la división de agua impulsada por luz visible.
- Para evaluar el rendimiento fotoelectroquímico del dispositivo fabricado.
Principales métodos:
- Síntesis de un catalizador de oxidación de agua molecular (2) y fotosensibilizador (1).
- Inmovilización de componentes (1+2) en partículas de TiO2 nanoestructuradas en vidrio FTO.
- Fabricación de un fotoánodo (TiO2 ((1+2)) para una célula fotoelectroquímica (PEC) de tres electrodos.
- Evaluación del rendimiento bajo irradiación de luz visible en un amortiguador de fosfato (pH 6.8).
Principales resultados:
- Demostración exitosa de la división del agua impulsada por luz visible.
- Evolución de las burbujas de oxígeno e hidrógeno de los respectivos electrodos.
- Se logró una alta densidad de fotocorriente superior a 1,7 mA·cm(-2) a 0,2 V frente a NHE.
- Esta densidad de fotocorriente es la más alta reportada para dispositivos PEC que utilizan componentes moleculares.
Conclusiones:
- El fotoánodo desarrollado (TiO2 ((1+2)) permite la división eficiente del agua solar.
- La combinación de catalizadores moleculares y fotosensibilizadores en TiO2 nanoestructurado es una estrategia prometedora para la fotosíntesis artificial.
- Este trabajo establece un nuevo punto de referencia para los dispositivos de división de agua fotoelectroquímicos basados en moléculas.
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