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Célula fotoelectroquímica no asistida con modulación multimediadora para la división solar del agua que supera el 4%
Sheng Ye1, Wenwen Shi1,2, Yong Liu1
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, P. R. China.
Journal of the American Chemical Society
|August 3, 2021
Resumen
Los investigadores desarrollaron una nueva plataforma fotoelectroquímica para la conversión eficiente de energía solar. Este sistema utiliza la modulación de multimediadores para lograr la división total del agua sin ayuda, produciendo energía química a partir de la luz solar con una eficiencia solar-hidrógeno del 4,3%.
Área de la Ciencia:
- Ciencias de los materiales
- Energía renovable
- La fotoquímica
Sus antecedentes:
- La separación fotoelectroquímica (PEC) del agua es una tecnología clave para la producción de combustible solar.
- Las células PEC actuales se enfrentan a desafíos con una transferencia de carga ineficiente, lo que limita la eficiencia de conversión de energía solar.
- Imitar la fotosíntesis natural ofrece una vía para superar estas limitaciones.
Objetivo del estudio:
- Desarrollar una plataforma PEC avanzada para la división global de agua sin ayuda.
- Mejorar la separación y el transporte de cargas mediante la modulación multimediadora.
- Mejorar la eficiencia de la conversión solar en hidrógeno.
Principales métodos:
- Se ha ensamblado una plataforma PEC que integra el fotoánodo de óxido inorgánico (BiVO4) y el fotocátodo de polímero orgánico (PBDB-T:ITIC:PC71BM).
- Modulación multimediadora empleada para facilitar la transferencia de electrones a lo largo de un gradiente de potencial electroquímico.
- Se utilizó la absorción de luz complementaria entre el fotoánodo y el fotocátodo.
Principales resultados:
- Se ha logrado una separación y un transporte eficientes de la carga a través del sistema multimediador.
- Se ha demostrado una reducción de las tasas de recombinación de carga.
- Se obtuvo una eficiencia de conversión solar a hidrógeno (STH) del 4,3%.
Conclusiones:
- La plataforma PEC desarrollada con modulación multimediadora permite una división general de agua eficiente sin asistencia.
- La construcción de una cadena de transferencia de carga eficiente es crucial para los sistemas de fotosíntesis artificial.
- Este trabajo proporciona una estrategia de diseño racional para la producción avanzada de combustible solar.
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