Hydrogen insertion (intercalation) and light induced proton exchange at TiO2(B) -electrodes
- Cite this article as:
- Betz, G., Tributsch, H. & Marchand, R. J Appl Electrochem (1984) 14: 315. doi:10.1007/BF01269931
- 326 Downloads
TiO2(B) obtained from K2Ti4O9 by hydrolysis and subsequent heating is a semiconductor whose crystal structure allows the insertion of guest atoms. Photoelectrochemical experiments characterized the polycrystalline material as n-type with an energy gap of 3 eV. As a result of electrochemical reduction of protons at TiO2(B)-electrodes new electronic states appear within the energy gap, making the semiconductor sensitive for visible light. These states originate from intercalated hydrogen which diffuses through the sample. Upon optical excitation of these states an anodic photocurrent is observed that can be interpreted as light-induced deintercalation of hydrogen from TiO2(B) to give protons.