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Electrochemical imp...
Electrochemical impedance and X-ray absorption spectroscopy analyses of degradation in dye-sensitized solar cells containing cobalt tris(bipyridine) redox shuttles
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- Gao, Jiajia (author)
- KTH,Molekylär elektronik, CMD,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden
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- Tot, Aleksandar (author)
- KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden
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- Tian, Haining, 1983- (author)
- Uppsala universitet,Fysikalisk kemi
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- Gardner, James M., 1982- (author)
- KTH,Molekylär elektronik, CMD,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden
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- Phuyal, Dibya, 1985- (author)
- KTH,Material- och nanofysik,KTH Royal Inst Technol, Dept Mat & Nanophys, SE-10044 Stockholm, Sweden
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- Kloo, Lars (author)
- KTH,Molekylär elektronik, CMD,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden
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(creator_code:org_t)
- 2022
- 2022
- English.
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In: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 24:31, s. 18888-18895
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Abstract
Subject headings
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- Electrochemical impedance spectroscopy (EIS) is a commonly used steady-state technique to examine the internal resistance of electron-transfer processes in solar cell devices, and the results are directly related to the photovoltaic performance. In this study, EIS was performed to study the effects of accelerated ageing, aiming for insights into the degradation mechanisms of dye-sensitized solar cells (DSSCs) containing cobalt tris(bipyridine) complexes as redox mediators. Control experiments based on aged electrolytes differing in concentrations of the redox couple components and cation co-additives were conducted to reveal the correlation of the cell degradation with external and internal properties. The failure modes of the cells emerged as changes in the kinetics of charge- and ion-transfer processes. An insufficient concentration of the redox complexes, in particular Co(iii), was found to be the main reason for the inferior performance after ageing. The related characterization of electrolytes aged outside the solar cell devices confirms the loss of active Co(iii) complexes in the device electrolytes. A new EIS feature at low frequencies emerged during ageing and was analysed. The new EIS feature demonstrates the presence of an unexpected rate-limiting, charge-transfer process in aged devices, which can be attributed to the TiO2/electrolyte interface. High-resolution fluorescence detected X-ray absorption spectroscopy (HERFD-XAS) was performed to identify the reduction of a part of Co(iii) to Co(II) after ageing, by investigating the Co K absorption edge. The HERFD-XAS data suggested a partial reduction of Co(iii) to Co(ii), accompanied by a difference in symmetry of the reduced species.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Keyword
- Additives
- Charge transfer
- Cobalt compounds
- Degradation
- Dye-sensitized solar cells
- Electrolytes
- Electron transport properties
- Reduction
- Solar power generation
- Titanium dioxide
- X ray absorption spectroscopy
- Bipyridines
- Dye- sensitized solar cells
- Electrochemical impedance
- Electrochemical-impedance spectroscopies
- Electron transfer process
- Internal resistance
- Redox shuttle
- Solar cell devices
- Steady state techniques
- X-ray absorption spectroscopy
- Electrochemical impedance spectroscopy
Publication and Content Type
- ref (subject category)
- art (subject category)
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