Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
A photoelectrode for solar-chemical production system was constructed by Cu(InxGa1-x)(SySe1-y)2 (CIGS) thin film based solar cell technology. Particularly, low cost solution process was applied to synthesize CIGS thin films which were also tried to be fabricated on low cost and earth abundant material substrate, stainless steel (SS). Since the SS can act as an electrocatalyst for oxygen evolution reaction (OER) the CIGS on SS would have bifunctionality of photo-charge generation and overpotential reduction for water oxidation. In order to prepare highly efficient bifunctional CIGS photoelectrode the electrocatalytic properties of SS were investigated with respect to the individual process for the CIGS film synthesis (e.g. oxidation, sulfurization, and selenization). We found that the harsh oxidation of SS resulted in the formation of OER active-surface structure of NiOOH. In addition, both sulfurization and selenization of SS were found to assist the formation of Ni-Fe mixed oxide phase on SS during OER. These results imply the possibility of bilateral synthesis of the efficient photoelectrode composed of CIGS thin film solar cell and OER catalyst in a single substrate. The details of the synthetic method and characterization of each component and the solar-fuel chemical system will be discussed in the presentation.
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