Influence of precursors on the morphology and performance of TiO2 photoanodes

Influence of precursors on the morphology and performance of TiO2 photoanodes

TiO2 precursors with different rates of hydrolysis were used to modify the microstructures of the resulting TiO2 photoanodes. The photoelectrochemical quantum yield for electrodes prepared from citrate remained low. Acetate precursors gave rise to electrodes with high fill factors and high open circ...

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Veröffentlicht in:Journal of materials science 1991-06, Vol.26 (12), p.3305-3308
Hauptverfasser: MAILHE-RANDOLPH, C, MCEVOY, A. J, GRATZEL, M
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Sprache:eng
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Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
High temperature electrochemistry (including molten salts)
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container_end_page 3308
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container_title Journal of materials science
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creator MAILHE-RANDOLPH, C
MCEVOY, A. J
GRATZEL, M
description TiO2 precursors with different rates of hydrolysis were used to modify the microstructures of the resulting TiO2 photoanodes. The photoelectrochemical quantum yield for electrodes prepared from citrate remained low. Acetate precursors gave rise to electrodes with high fill factors and high open circuit voltages. Titanium isopropoxide hydrolysed very rapidly, leaving a powdery, poorly compacted deposit. Photoanodes from TiCl4 precursors exhibit high surface roughness, which is necessary for a high degree of dye adsorption. With high hydrolysis rates, isopropoxide precursors produced powdery, poorly coherent films. A composite electrode with an acetate-based substrate and TiCl4-based surface layers appears to be a suitable compromise. 9 refs.
doi_str_mv 10.1007/BF01124677
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subjects Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
High temperature electrochemistry (including molten salts)
title Influence of precursors on the morphology and performance of TiO2 photoanodes
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