Publication date: 31st March 2013
In the last years, water splitting with metal oxide semiconductors has attracted a great deal of attention as a promising technology to provide fuels with the only input of sunlight. Metal oxide semiconductors appear as candidate systems to photo-oxidize water and nanostructuring strategies together with the addition of co-catalysts have been widely employed in order to increase the energy conversion efficiency. In this context, the basic understanding of the traffic of carriers leading to the interfacial electrochemical reactions is a key issue to rationalize the both synthetic routes for materials development and device engineering. In the present talk, we will focus on the interpretation of carrier dynamics based on physical modeling of photoelectrochemical devices fed by experimental results obtained from electrochemical characterization (cyclic voltammetry and impedance spectroscopy). We will examine the role of surface states on water oxidation with Fe2O3 and the effect of catalytic layers of Cobalt and Irididum based systems.[1-3]
Figure: Cross section of Fe2O3 deposited on a FTO substrate with a catalytic IrOx layer and j-V curves obtained under illumination at 100 mW·cm-2 for IrOx layers deposited from solutions with different concentration of Ir.
[1] Klahr B.; Giménez S.; Fabregat-Santiago F; Hamann T.W.; Bisquert J. Electrochemical and Photoelectrochemical Investigation of Water Oxidation with Hematite Electrodes. Energy and Environmental Science, 2012, 5, 7626-7636. [2] Klahr B.; Giménez S.; Fabregat-Santiago F; Hamann T.W.; Bisquert J. Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co-Pi” coated Hematite Electrodes. Journal of the American Chemical Society, 2012, 134 (9), 16693-16700. [3] Badia-Bou L.; Mas-Marza E.; Rodenas P.; Barea E.M.; Fabregat-Santiago F.; Giménez S.; Eduardo Peris; Bisquert J. Water oxidation at hematite photoelectrodes with a metallorganic Iridium based catalyst. Journal of Physical Chemistry C, 2013, 117, 3826-3833.
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