Kyoto University · Chemistry
Professor Asuman Çelik Küçük’s research lab specializes in the design and synthesis of functional silsesquioxane-based materials, particularly focusing on their applications in energy storage and electrochemical systems. The lab explores advanced electrolytes—especially fluoride-ion conducting systems—using innovative molecular architectures such as double-decker POSS, phosphonic acid-functionalized silsesquioxanes, and core-corona amphiphiles to enhance ion transport, stability, and interfacial properties. Key research directions include fluoride shuttle batteries, proton and lithium-ion conductive materials, and the integration of transition metal complexes into polyhedral frameworks for optoelectrochemical applications.
Figures are computed from collected data and may differ slightly.
Using lithium bis(oxalato)borate for a fluoride shuttle battery in organic solvents allowed a successful fluoride shuttle-based redox reaction.
To exploit the excellent safety as well as the thermal and electrochemical properties of siloxane-based liquid electrolytes, 2,2,4,4-tetramethyl-3,8,11,14,17-pentaoxa-2,4-disilaoctadecane was used as an electrolyte for the first time in a fluoride shuttle battery system.
As described in this paper, phosphonic-acid-containing double-decker-shaped polyhedral silsesquioxane (PHOS-DDSQ) was synthesized and the proton conductivity of the PHOS-DDSQ cast film was studied under humid and non-humid conditions. To synthesize PHOS-DDSQ, double-decker-shaped polyhedral silsesquioxane (DDSQ) was initially reacted with di(ethylene glycol) (DEG) vinyl ether using hydrosilylation reaction to attach four DEG units to one DDSQ (4DEG-DDSQ). Subsequently, a phosphate esterification
"Core-corona" type amphiphiles, which comprise double-decker-shaped POSSs (DDSQs) as the core and two or four di(ethylene glycol) (DEG) units as the coronae, have recently been reported to form a stable monolayer at the air-water interface. In this paper, another core-corona amphiphile, 2DEGNH-DDSQ, which has a urethane group at the end of the coronae, was synthesized to elucidate the effects of hydrogen bonding on monolayer properties. The surface pressure-area isotherm and Brewster angle micro
A double-decker silsesquioxane based bis(terpyridine) ruthenium(ii) complex (2Tpy/Ru-DDSQ), a member of the polyhedral oligomeric silsesquioxane (POSS) class, has been synthesized. Its structure has been characterized using comprehensive techniques such as nuclear magnetic resonance (<sup>1</sup>H NMR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and UV-visible spectroscopy. This work not only deals with the synthesis of 2Tpy/Ru-DDSQ but also provides the first comprehensive investigati
The effects of using low-cost inorganic fluoride salts (i.e., KF or NaF) as fluoride sources in fluoride shuttle batteries (FSBs) on the electrochemical compatibility of BiF 3 electrodes are investigated herein. The preparation of electrolytes containing saturated KF or NaF and 0.5 M 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (DiOB-Py) in G4 is described. For Py/NaF/G4, the discharge and charge reactions of BiF 3 were hindered because of the low solubility of NaF as well as the low
The potential effects of using lithium bis(oxalato)borate (LiBOB) as an electrolyte additive on the redox reactions of the positive bismuth fluoride (BiF 3 ) electrode were investigated in tetraglyme (G4) containing the anion acceptor (AA) triphenylboroxin (TPhBX). The electrolyte system, containing 0.06 M LiBOB, 0.5 M TPhBX, and saturated cesium fluoride (CsF) was prepared. The study also included a comparison with previously studied systems based on G4, which did not contain LiBOB but AA. The
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