TITLE:
Photoelectrochemical Studies on High Specific Capacitance-Photoactive Interfaces Based on Poly 3,4- Ethylenedioxythiophene/Metal Oxides Assemblies
AUTHORS:
Kasem K. Kasem, William Bennett, Heather Ramey, Nick Daanen
KEYWORDS:
Inorganic/Organic Semiconductors, Photoelectrochemical Cells, High Capacitive Assembly
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.3 No.5,
May
22,
2015
ABSTRACT: Inorganic/organic interfaces (IOI) consist of TiO2/PEDOT (poly 3,4-ethylenedioxythiophene) and
[PMo12O40]3- or MoO3/PEDOT were subject to photoelectrochemical studies in both aqueous nanosuspensions
and in thin solid films. The effects PEDOT modifier caused on the photoelectrochemical
behavior of the IOI were investigated using [Fe(CN)6]4- as the photoactive hydrated electron
donor agent. Results show that native PEDOT or PEDOT doped with MoO3 thin films increased
charge storage capability evident by the high capacitive current. In the case of nano suspensions
composed of TiO2/PEDOT the adsorption process of [Fe(CN)6]3- (photolysis product) control of the
photoactivity outcome of the IOI assemblies. TiO2/PEDOT shows a lower heterogeneous photochemical
response than native TiO2 in short term photolysis times. At longer photolysis times the
IOI shows photoactivity greater than that of native TiO2. The interface activities were explained by
analyzing the IOI junction characteristics, such as electron affinity, work function and hole/electrons
barrier heights. The aqueous nano-systems retained moderate stability as indicated by the
reproducibility of their photocatalytic activities. Both [Fe(CN)6]4-and PEDT contributed to the
stability of native TiO2 surfaces.