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Los complejos de polipiridina sustituidos de cobalto ((II/III) como mediadores eficientes de transferencia de
Shawn A Sapp1, C Michael Elliott, Cristiano Contado
1Contribution from the Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA.
Journal of the American Chemical Society
|September 13, 2002
Resumen
Los nuevos complejos de cobalto ofrecen un mediador de transferencia de electrones alternativo estable y no corrosivo para las células solares sensibilizadas a tintes (DSSC), mejorando el rendimiento con aditivos de sal de litio.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- Energía renovable Energía renovable.
Sus antecedentes:
- Las parejas redox tradicionales de yoduro/trioduro en las células solares sensibilizadas por colorantes (DSSC) son volátiles y corrosivas.
- El desarrollo de mediadores estables y eficientes de transferencia de electrones es crucial para el avance de la tecnología DSSC.
Objetivo del estudio:
- Sintetizar e investigar los complejos de cobalto como potenciales mediadores no volátiles y no corrosivos para las DSSC.
- Para evaluar el rendimiento de estos complejos de cobalto en comparación con los mediadores tradicionales.
- Comprender los factores que influyen en el rendimiento del mediador, incluido el material del electrodo y los aditivos.
Principales métodos:
- Síntesis de complejos de cobalto con ligandos de polipiridina sustituidos.
- Caracterización mediante espectroscopia visible y voltametría cíclica.
- Montaje y prueba de DSSCs con mediadores complejos de cobalto y varios materiales de cátodo (oro, carbono, platino).
- Investigación del efecto de los aditivos de sales de litio en el rendimiento celular.
Principales resultados:
- Los complejos de cobalto exhibieron coeficientes de extinción adecuados, minimizando la competencia con el tinte.
- Las tasas de transferencia de electrones mostraron una dependencia significativa del material del electrodo; el oro y el carbono superaron al platino.
- No se observó corrosión del material del cátodo.
- La adición de sales de litio mejoró dramáticamente el rendimiento del DSSC al reducir la recombinación.
- El mejor mediador de cobalto logró eficiencias comparables a los sistemas de yoduro/trioduro.
Conclusiones:
- Los complejos de cobalto son mediadores de transferencia de electrones efectivos, no volátiles y no corrosivos para los DSSC.
- El oro y el carbono son materiales de cátodo superiores para estos mediadores.
- La adición de sal de litio mejora significativamente el rendimiento del DSSC.
- Esta investigación presenta un mediador alternativo práctico y eficiente para las aplicaciones de células solares.
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