Photoelectrochemical studies on acid-doped polyaniline as sensitizer for TiO2 nanoporous film

Potential Applications for Solar Photocatalysis: From Environmental Remediation to Energy Conversion

“…Certain photoactive compounds has proven to be able, when electronically excited, to inject electrons in the conduction band of semiconductors (Grätzel, 2001;Ino et al, 2005;Rehm et al, 1996;Nazeeruddin et al, 1993;Asbury et al, 2001;Krüger et al, 2001;Argazzi et al, 1998;Xargas et al, 2000;Tennakone et al, 1997;Sharma et al, 1991;Hao et al, 1998;Chen et al, 1997;Wu et al, 2000), increasing the performance of dye-sensitized solar cells. In www.intechopen.com particular, ultrafast charge separation led by electron injection from electronically excited photoactive molecules to the conduction band of a wide-gap metal oxide, and a good electronic coupling between dye molecules and surface of the substrate are key steps for improving the performance of these materials (Rehm et al, 1996;Nazeeruddin et al, 1993;Asbury et al, 2001).…”

Photoelectrochemical cells based on emeraldine base form of polyaniline

“…9 EB that is protonated with different acids has been investigated as a holetransporting layer in polymer light emitting diodes, as a photoactive layer in Schottky diodes, and as a sensitizer for nanocrystalline TiO 2 (Nc-TiO 2 ) film in the presence of KI/I 2 in an aqueous electrochemical cell and in a solidstate photoelectrochemical cell (PEC). [10][11][12][13] In the later case the device consists of EB doped with dodecylbenzene sulphonic acid and blended with ethylene-propylene-diene terpolymer as a working electrode, poly(ethyleneoxide-co-epichlorohydrine)/ NaI-I 2 as a polymer electrolyte and Pt as a counter electrode. According to the report, the V OC of the device was zero both in the dark and under illumination while a cathodic current was observed in the dark at negative applied potentials, the magnitude of which increased under illumination.…”

<b>SYNTHESIS AND CHARACTERIZATION OF POLY[3-(2\',5\'-DIHEPTYLOXY- PHENYL)THIOPHENE] FOR USE IN PHOTOELECTROCHEMICAL CELLS</b>

“…Various studies with different approaches have been carried out to alleviate the problems associated with liquid-state DSSCs. These include replacement of the liquid electrolyte by a polymer electrolyte [5], introduction of gelifiers [6] and nanocomposite organic-inorganic gel [7] into the electrolyte and replacement of the dye by a semiconducting polymer [8][9][10].…”

“…The sensitization of inorganic semiconductors by conjugated polymers [8,10] has been investigated in liquid-state PECs where the hole-mobility is facilitated by the redox couple. Devising DSSCs with conducting polymers requires preparation of suitable polymers with appropriate band gaps, band positions (with respect to the inorganic semiconductor) and method of deposition.…”