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Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells
KTH Royal Institute of Technology, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
KTH Royal Institute of Technology, Sweden.
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2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 33, p. 19495-19505Article in journal (Refereed) Published
Abstract [en]

Lithium-ion-free tris(2,2′-bipyridine) Co(ii/iii)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox systems also offer an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambiguously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversible redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc-Voc trade-off in Co(ii/iii)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system. 

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2019. Vol. 7, no 33, p. 19495-19505
Keywords [en]
Charge transfer, Cobalt, Economic and social effects, Electrolytes, Redox reactions, Control experiments, Electrode/electrolyte interfaces, Light effects, Light exposure, Photo-voltage, Photoelectrochemical system, Redox systems, Spectroscopic investigations, Dye-sensitized solar cells
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40909DOI: 10.1039/c9ta07198aScopus ID: 2-s2.0-85071187004OAI: oai:DiVA.org:ri-40909DiVA, id: diva2:1375353
Note

Funding details: China Scholarship Council, CSC; Funding details: Energimyndigheten; Funding details: Vetenskapsrådet, VR; Funding text 1: We gratefully acknowledge the Swedish Research Council, the Swedish Energy Agency as well as the China Scholarship Council (CSC) for nancial support. The authors also thank Dr Lei Wang for his helpful assistance in 1H-NMR spectroscopic studies.

Available from: 2019-12-04 Created: 2019-12-04 Last updated: 2019-12-04Bibliographically approved

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