ELECTRON INJECTION INTO TI(IV)-BASED OXIDIC MATERIALS: APPLICATION IN LI-ION BATTERIES AND SOLAR CELLS
WG4 members: Ladislav Kavan, Markéta Zukalová, Otakar Frank, Arnošt Zukal, Vera Mansfeldova
webpage: www.jh-inst.cas.cz
The group works on the synthesis of electrode materials based on reducible Ti(IV) oxides, both binary and ternary, in different crystal modifications and mesoscopic structures. Materials are characterized by various analytical, microscopic and spectroscopic methods. Emphasis is on electrochemical, photoelectrochemical and spectrophotoelectrochemical techniques. The group is equipped with electrochemical instrumentation, including EIS and ECQM, an Ar-filled glove box, HR-SEM, STM and AFM, Raman spectroscopy, XRD, a set-up for adsorption measurements, a QE/IPCE measurement system and a Solar simulator with an IV module. The research is aimed at the explanation of electron injection and transport in semiconducting reducible oxides both in the depletion and accumulation modes. Phase changes during electron injection are described and different mechanisms of electron injection are addressed. The obtained knowledge is applied for the design and demonstration of two practical devices: dye-sensitized solar cells and Li-ion batteries.
In-situ Raman spectroelectrochemistry of phase transition during Li-insertion into TiO2 (anatase). The spectral assignment is supported by 16/18O and 6/7Li isotope labeling. B. Laskova et al. Chem.Mater. doi.org/10.1021/cm402056j (2013).
