This paper presents the development of photoelectrochemical (PEC) setup using multiple bandgap combination of CuIn1−xGaxS2 (CIGS2) thin-film photovoltaic (PV) cell and ruthenium oxide (RuO2) photocatalyst. FSEC PV Materials Lab has developed a PEC setup consisting of two illuminated CIGS2 cells, a ruthenium oxide (RuO2) anode deposited on titanium sheet for oxygen evolution and a platinum foil cathode for hydrogen evolution. With this combination, a PEC efficiency of 4.29% has been achieved.

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