Ograniczenia wydajności separacji i transportu ładunku w ogniwach słonecznych oraz układach do rozdziału wody zawierających kompleksy rutenu
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Date
2020
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Limitations of charge separation and transport efficiency in solar cells and water splitting systems containing ruthenium complexes
Abstract
Rozprawa doktorska złożona jest ze zbioru publikacji. Ich treść dotyczy zastosowania kompleksów rutenu z ligandami polipirydylowymi w ogniwach słonecznych sensybilizowanych barwnikami (DSSCs) oraz ogniwach fotoelektrochemicznych sensybilizowanych barwnikami przeznaczonych do rozdziału wody (DSPECs).
Badania eksperymentalne w ramach pracy doktorskiej zostały przeprowadzone w celu poznania dynamiki transferu elektronu, zachodzącego w wymienionych układach. Zastosowanie ultraszybkiej spektroskopii laserowej pozwoliło na charakteryzację kluczowych, sub-nanosekundowych procesów: wstrzykiwania elektronu, wstecznego transferu elektronu oraz transferu pomiędzy barwnikiem a katalizatorem. Aby zbadać procesy w dłuższych skalach czasowych (od milisekund do sekund), wykorzystano metodę elektrochemicznej spektroskopii impedancyjnej. Uzupełniające badania bazowały na pomiarach fotoelektrochemicznych.
Wybrane kompleksy rutenowe wykorzystano do przygotowania modelowych fotoanod, które z kolei zostały użyte w kompletnych ogniwach słonecznych i fotoelektrochemicznych. Ponadto przetestowano działanie nowo zsyntetyzowanego katalizatora do wydzielania tlenu.
Charakterystyka układów ujawniła zależności między dynamiką transferu ładunku a warunkami eksperymentalnymi, składem elektrolitu i strukturą fotoanody. Zbadano także stabilność fotoanod w czasie w elektrolitach na bazie wody.
The PhD thesis is based on a series of papers reporting the studies of the application of polypyridyl ruthenium complexes in dye-sensitized sunlight conversion devices – dye-sensitized solar cells (DSSCs) and water splitting dye-sensitized photoelectrochemical cells (DSPECs). Time-resolved laser spectroscopy experiments were aimed at characterization of the kinetics of the key sub-nanosecond processes: electron injection, back-electron transfer and electron transfer between dye and catalyst, taking place in the cells. To investigate charge transfer and transport on longer time scales (from milliseconds to seconds), electrochemical impedance spectroscopy was conducted. These studies were supplemented with photoelectrochemical measurements. Popular polypyridyl ruthenium complexes were chosen to prepare model photoanodes. The latter were studied in complete solar cells or photoelectrochemical cells. Moreover, the application of a newly synthesized oxygen evolving catalyst was tested. Characterization of dye-sensitized systems revealed numerous dependencies of charge transfer dynamics on experimental conditions, electrolyte composition and photoanode structure. The stability of dye-sensitized photoanodes in water-based electrolytes was also investigated and discussed. The financial support from the Polish National Science Centre awarded through grant NCN/2015/18/E/ST4/00196 is acknowledged.
The PhD thesis is based on a series of papers reporting the studies of the application of polypyridyl ruthenium complexes in dye-sensitized sunlight conversion devices – dye-sensitized solar cells (DSSCs) and water splitting dye-sensitized photoelectrochemical cells (DSPECs). Time-resolved laser spectroscopy experiments were aimed at characterization of the kinetics of the key sub-nanosecond processes: electron injection, back-electron transfer and electron transfer between dye and catalyst, taking place in the cells. To investigate charge transfer and transport on longer time scales (from milliseconds to seconds), electrochemical impedance spectroscopy was conducted. These studies were supplemented with photoelectrochemical measurements. Popular polypyridyl ruthenium complexes were chosen to prepare model photoanodes. The latter were studied in complete solar cells or photoelectrochemical cells. Moreover, the application of a newly synthesized oxygen evolving catalyst was tested. Characterization of dye-sensitized systems revealed numerous dependencies of charge transfer dynamics on experimental conditions, electrolyte composition and photoanode structure. The stability of dye-sensitized photoanodes in water-based electrolytes was also investigated and discussed. The financial support from the Polish National Science Centre awarded through grant NCN/2015/18/E/ST4/00196 is acknowledged.
Description
Wydział Fizyki
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NCN/2015/18/E/ST4/00196
Keywords
ogniwa słoneczne sensybilizowane barwnikami, ogniwa fotoelektrochemiczne sensybilizowane barwnikami, kompleksy rutenu z ligandami polipirydylowymi, femtosekundowa absorpcja przejściowa, rozdział wody, dye-sensitized solar cell, dye-sensitized photoelectrochemical cell, polypyridyl ruthenium complexes, femtosecond transient absorption, water splittting