Semiconducting metal oxide photoelectrodes: their probed characteristics and implications (pt5)
by Sardar K. Bahador
International Journal of Materials and Product Technology (IJMPT), Vol. 10, No. 3/4/5/6, 1995

Abstract: Due to energy crises and vital necessities for finding some truly clean and durable energy sources as well as providing the means required for efficient conversion, storage, and utilisation of such energies, intensive systematic work have been carried out since 1979 which deals primarily with the materials, processes and devices of interest excluding absolutely the nuclear energy. Effective exploitation of the eternally available, environmentally clean and embargo-proof solar power is the most promising one where utilisation of its radiant energy at least, will enable us to cope with the world's future energy needs. In this respect, various organic and inorganic semiconducting materials and corresponding energy systems are investigated. The nature and fates of parameters involved in the preparative processes and characterization methodologies of the thermal and anodic oxides, CVD and rf sputtered thin films, and the chemicallv synthesised powders are taken into account. Ample evidences showing the effects of such parameters on the system efficiencies have been furnished via stepwise tests on structural, surface, electrical, optical, magnetic, photovoltaic, PV, and photoelectrochemical, PEC, behaviours using XRD, XRF, SEM, AES, ESCA, EXAFS, EPMA, IR. Raman, ESR, NMR, spectrography, atomic absorption, magnetic susceptibility techniques. Beside the application of primarily oxides in lithium batteries, sensors, pigment technologies, microelectronics, PV and PEC devices, by taking into account the PEC cell functions, even though buffered electrolytes are usually employed, a three dimensional graphic correlation of the electrode potential, E_H, with PH and percent oxidation (or reduction) of the redox species present in the non-buffered electrolyte is drawn. The roles of sensitising dyes such as RhB, Th, and MB together with the results of PEC measurements on sintered and rf sputtered thin film electrodes, and the energetic diagram of a PEC cell operating under power generating conditions are presented. The diverse impacts of many of the electrode materials' processing and PEC cell parameters on (photo-)electrodics are explored elsewhere.

Online publication date: Wed, 03-Nov-2010

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