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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Energy Storage and Batteries II
CPP 19.12: Vortrag
Dienstag, 19. März 2024, 12:30–12:45, H 0111
The Role of Oxygen in Phenazine-TCNQ Charge-Transfer Complex Regeneration — •Kirill Gubanov1, Yana Reva1, Daniel Langford1, Frank Hampel1, Andreas Späth1, Evanie Franz1, Ryan W. Crisp1, Sebastian Bochmann1, Benjamin Watts2, Jörg Libuda1, Dirk M. Guldi1, and Rainer H. Fink1 — 1Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Germany — 2Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
Organic charge-transfer complexes (CTC) are promising candidates as electrode material in rechargeable lithium-ion batteries. Besides being renewable, non-toxic and affordable in contrast with their inorganic counterparts, the intrinsic features of the organic CTC, such as electrical conductivity or high cycle performance, are greatly enhanced in comparison with their single-moiety parent components. However, the charge-trap states, induced by the structural defects within the CTC crystal lattice lower the initial degree of charge transferred from the electron donor to acceptor molecules. Remarkably, oxygen-enriched environment regenerates the charge-transfer process in the complex of Phenazine (PNZ)/Tetracyanoquinodimethane (TCNQ) CTC crystal nanoaggregates. By means of the NEXAFS-based microspectroscopy and (spectro)electrochemical methods, we prove that the oxygen donates electrons to fill the trap states and ultimately enhances the degree of charge-transfer from PNZ to TCNQ, improving the overall charge-transport properties of the material. The research is funded by the BMBF (contract 05K19WE2).
Keywords: Organic Electronics; Charge-Transfer Complex; Nanoaggregates; X-ray Microspectroscopy; Charge-Trap States