Electrochemical and spectroelectrochemical study of nanocrystalline TiO2 anatase with exposed (001) faces

0393334 - ÚFCH JH 2014 RIV CZ eng C - Conference Paper (international conference)
Lásková, Barbora - Zukalová, Markéta - Bouša, Milan - Kavan, Ladislav - Liska, P. - Grätzel, M.
Electrochemical and spectroelectrochemical study of nanocrystalline TiO2 anatase with exposed (001) faces.
New trends in application of photo and electro catalysis. Proceedings of the 4th Czech-Austrian workshop. Prague: Institute of Chemical Technology, 2012 - (Krýsa, J.; Klusoň, P.), s. 120-124. ISBN 978-80-7080-809-2.
[New trends in application of photo and electro catalysis. The Czech-Austrian workshop /4./. Hnanice (CZ), 05.12.2011-07.12.2011]
R&D Projects: GA AV ČR IAA400400804; GA AV ČR KAN200100801; GA MŠMT LC510
Institutional research plan: CEZ:AV0Z40400503
Keywords : titanium dioxide * flatband potential
Subject RIV: CG - Electrochemistry

The electrochemical and spectroelectrochemical behavior ot TiO2 anatase with a predominant (001) face was studied and compared to a reference anatase material with dominating (101) face. The electrochemical measurements indicate that Li-ion insertion/extraction is facilitated for TiO2 anatase with (001) faces as compared to (101) one. The performance of both different crystal morphologies as a photoanode material in DSC (dye sensitized solar cell) was tested too. The (001) face adsorbed smaller amount of the used dye sensitizer (C101) but provides larger open circuit voltage (Uoc) of the solar cell. The different band energetics of both particular morphologies was suggested to be the reason for the voltage enhancement of the device employing (001) anatase. To prove our hypothesis and determine their flatband potential, a spectroelectrochemical study of transparent films of nanocrystalline (001) and (101) anatase on coaducting glass was carried out. UV/Vis spectra were measured at potentials between 0 and -1.4V vs SCE and confirmed the negative shift of flatband potential for (001) anatase as compared to (101) one.
Permanent Link: http://hdl.handle.net/11104/0222063