Substitutional and defect doping effects on the photoelectrochemical properties of transition metal oxide electrodes

Conference · Thu Dec 01 04:00:00 EST 1983 · Alternative Energy Sources; (United States)

OSTI ID:6684573

Houlihan, J F; Bain, A; Pannaparayil, T; Pollock, R J

Central to achieving the optimization of the photoelectrochemical properties of semiconductor electrodes is an understanding of the influence of the method and degree of electrode doping. To this end we have prepared both stoichiometrically (substitutionally) doped and nonstoichiometrically (defect) doped electrodes of TiO/sub 2/ and Fe/sub 2/O/sub 3/. Stoichiometric TiO/sub 2/ and Fe/sub 2/O/sub 3/ are excellent insulators at normal temperatures. In order to increase the conductivity of such materials sufficiently to allow their use as photocatalysts, samples are often heated in various reducing atmospheres. Samples activated in this manner are said to be defect-doped or non-stoichiometrically-doped materials. We will report the effects of this type of doping on the photoelectrochemical properties of sintered Fe/sub 2/O/sub 3/ and TiO/sub 2/ over a wide range of doping densities. Parameters which have been investigated include optical-to-chemical conversion efficiency, electrical resistivity, spectral response and photocurrent onset potential. In addition, substitutionally doped TiO/sub 2/ and Fe/sub 2/O/sub 3/ electrodes have been prepared over a wide range of doping densities. TiO/sub 2/ has been doped with Nb/sub 2/O/sub 5/, Ta/sub 2/O/sub 5/ and Fe/sub 2/O/sub 3/ while Fe/sub 2/O/sub 3/ has been doped with SiO/sub 2/, ZrO/sub 2/ and RuO/sub 2/. Photoelectrochemical properties of these materials will be compared with the defect-doped electrode properties. The effects of surface modification such as chemical etching and Ru absorption will also be discussed. Where applicable, electron paramagnetic resonance spectroscopy and Mossbauer spectroscopy techniques have been utilized and these results will be correlated with photoelectrochemical parameters.

• Research Organization: Department of Chemistry Shenango Valley Campus, The Pennsylvania State University Sharon, Pennsylvania
• OSTI ID: 6684573
• Report Number(s): CONF-831205-
• Conference Information: Journal Name: Alternative Energy Sources; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
CORRELATIONS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ELECTRON SPECTROSCOPY
ELECTRON SPIN RESONANCE
ELEMENTS
ETCHING
IRON COMPOUNDS
IRON OXIDES
MAGNETIC RESONANCE
MATERIALS
METALLURGICAL EFFECTS
METALS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
RESONANCE
RUTHENIUM
SEMICONDUCTOR MATERIALS
SPECTRAL RESPONSE
SPECTROSCOPY
SURFACE FINISHING
TANTALUM COMPOUNDS
TANTALUM OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS