Abstract
Photoelectrodes with architecture FTO/Au/Sb2Se3/TiO2 for solar hydrogen evolution reactions (HER) and CO2 reduction reactions (CO2RR) were studied. The fabrication followed a simple spin-coating technique whereby nanorod-like structures were obtained for the Sb2Se3 as shown in the SEM images. A layer of TiO2 was deposited via ALD which acted as both an electron transfer layer and a protective coating. Pt and Au were deposited as co-catalysts and the photoelectrode performance for HER and CO2RR were investigated respectively (i.e., Pt for HER and Au for CO2RR). The photocurrent density achieved for HER reached 19 mA/cm2 at -0.35 V vs. RHE, while for CO2RR, it was 8 mA/cm2 at -0.5 V vs. RHE. The products detected for CO2RR were mainly hydrogen and CO with an average normalized distribution of 3:1 for hydrogen to CO. This set of initial experiments provide promising results for Sb2Se3-based photoelectrodes in solar-to-chemical applications.
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