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Overall Photoelectrochemical Water Splitting using Tandem Cell under Simulated Sunlight
Jin Hyun Kim1, Hiroyuki Kaneko2, Tsutomu Minegishi2
1School of Environmental Science&Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea.
Abstract:
A stand-alone photoelectrochemical (PEC) water-splitting system driven only by sunlight was demonstrated with a tandem-scheme of Pt/CdS/CuGa3 Se5 /(Ag,Cu)GaSe2 photocathode and NiOOH/FeOOH/Mo:BiVO4 photoanode in a neutral phosphate buffer solution as an electrolyte. The as-prepared semi-transparent Mo:BiVO4 layer allows sunlight to pass through the top photoanode and reach the bottom photocathode. Consequently, the tandem cell showed stoichiometric hydrogen and oxygen evolution with a solar-to-hydrogen (STH) conversion efficiency of 0.67 % over 2 h without degradation. The stability and STH efficiency are the highest among similar configuration of PEC tandem cells.
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