Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Indium tin oxide (ITO) surfaces of triple junction photovoltaic cells were functionalized with oxygen
evolving catalysts (OECs) based on amorphous hydrous earth-abundant metal oxides (metal = Fe, Ni,
Co), obtained by straightforward Successive Ionic Layer Adsorption and Reaction (SILAR) in an aqueous
environment. Functionalization with Fe(III) oxides gave the best results, leading to photoanodes capable
of efficiently splitting water, with photocurrent densities up to 6 ± 1 mA cm2 at 0 V vs. the reversible
hydrogen electrode (RHE) under AM 1.5 G simulated sunlight illumination. The resulting Solar To
Hydrogen (STH) conversion efficiencies, measured in two electrodes configuration, were in the range
3.7–5%, depending on the counter electrode that was employed. Investigations on the stability showed
that these photoanodes were able to sustain 120 minutes of continuous illumination with a ca. 10%
photocurrent loss at 0 V vs. RHE. Pristine photoanodic response of the cells could be fully restored by
an additional SILAR cycle, suggesting that the observed loss is due to the detachment of the more
weakly surface bound catalyst.
Cristino,V.; Berardi,S.; Caramori,S.; Argazzi R.; Carli S.; Meda,L.; Tacca, A.; Bignozzi C.A. Efficient solar water oxidation using photovoltaic devices functionalized with earth-abundant oxygen evolving catalysts Phys.Chem. Chem. Phys., 2013,15, 13083
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