Vh A Photoelectrochemical Solar Cell Employing a TiO, Anode and Oxygen Cathode (original) (raw)

The study of the photosensitive materials used in solar-hydrogen energy by a versatile photoelectrochemical cell

In this paper it was made a comparative study of the doped TiO2 thin films used as photoelectrodes by using a versatile photoelectrochemical cell. The experimental arrangement makes possible the relative evaluation of the electrodes properties by measurement of the electric parameters, giving directly I = f(U) for the cell electric circuit by using an "internal" chemical bias. It is also possible to measure the volume of the evolved gas, and to analyze it by a gas-chromatograph and by a mass spectrometer.

Oxidative photoelectrochemical technology with Ti/TiO2 anodes

Solar Energy Materials and Solar Cells, 2002

Rutile and anatase TiO 2 films have been grown on Ti plates by thermal (500-8001C) and anodic oxidation followed by thermal annealing (400-5001C), respectively. The photoelectrochemical efficiency of these photoanodes, evaluated by current density measurements in the photooxidation of 4-methoxybenzyl alcohol in deaerated CH 3 CN, has been determined. The photocurrent efficiency increases with the thickness of the TiO 2 rutile film up to 1 mm (the most efficient thickness). At the wavelengths furnished by the irradiation apparatus similar thicknesses of anatase and rutile films show nearly the same efficiencies. Anodic bias produces similar relative increases of current intensity in both crystalline forms. r (C. Rol). 0927-0248/02/$ -see front matter r 2002 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 7 -0 2 4 8 ( 0 1 ) 0 0 0 9 3 -9

An efficient photoelectrochemical cell functioning in the presence of organic wastes

Solar Energy Materials and Solar Cells, 2010

This work presents a design and studies the function of a photo-fuel cell, which can photocatalytically consume organic substances to produce electricity. The design resembles hydrogen fuel cells but, in the present case, hydrogen ions are produced photocatalytically in the presence of nanocrystalline titania. Results are presented for ethanol and glycerol but many other substances can be used as well. The cell can function in natural solar light by exploiting the UV portion of the solar spectrum. The produced current was enhanced when titania was combined with cadmium sulphide, which absorbs visible light.

Energy conversion in photoelectrochemical systems — a review

Electrochimica Acta, 1978

The different approaches to the conversion of solar energy into chemical and/or electrical energy employing photoelectrochemical (PEC) systems are outlined. Current work and the state-of-theart as regards the use of various semiconductors as photoelectrodes in PEC systems and the stabilization of low band-gap semiconductors by the use of redox couples are reviewed. A critical comparison of the various approaches to the problems associated with optimal photoresponse in PEC systems indicates that electrode stabilization is the most promising amongst the alternatives currently available for efficient conversion of visible light.

Photo-electrochemical properties of oxide semiconductors on porous titanium metal electrodes

Solar Energy Materials and Solar Cells, 2006

For the purpose of producing hydrogen using solar energy, we investigated the potential of porous titanium metal sheet (PTMS) with high surface area for use as the basal plates for various types of oxide semiconductor photo-electrodes. The TiO 2 photoelectrodes were prepared by oxidation of PTMS and flat titanium metal sheet (FTMS). The photocurrents of the TiO 2 /PTMS electrodes were always higher than TiO 2 /FTMS under the same oxidation conditions. The reflectance of PTMS was lower than FTMS over the entire wavelength spectrum, suggesting that the scattered light was absorbed more effectively on the former. A nanocrystalline WO 3 layer-loaded PTMS electrode (WO 3 /PTMS) showed a high photocurrent compared to WO 3 /FTMS, suggesting that PTMS is highly suitable as basal plates for semiconductor photoelectrodes. r

SOLID STATE PHOTOELECTROCHEMICAL CELL BASED ON DYE SENSITIZED TiO2 AND POLYMER ELECTROLYTE COMPLEXED WITH I3¯/I¯

Sinet Ethiopian Journal of Science, 2012

A solid state photoelectrochemical solar energy conversion device based on nanocrystalline-TiO 2 sensitized with Di-Tetrabutylammoniumcis-bis(isothiocyanato)bis(2,2'bipyridyl-4,4'-dicarboxylato)-ruthenium(II) (N719) dye has been constructed and characterized. The current density-voltage characteristics in the dark and under white light illumination and action spectra under monochromatic illuminations have been studied. The following device parameters were obtained when the potential is scanned: an open circuit voltage of 762 mV and a short circuit current density of 33 μAcm-2 at light intensity of 100 mWcm-2 ; the IPCE percentage obtained was 1.7% at 330 nm. The dependence of the short-circuit current density and an open circuit voltage on the incident light intensity and illumination time have also been studied. The results of time dependence study show that the steady state J sc and V oc values are consistent with those obtained from the J-V curve.