Exploring the Influence of Au Underlayer Thickness on Photocathode Performance

Copper (I) oxide (Cu2O) is a promising photocathode for photoelectrochemical (PEC) water splitting. Here we study gold (Au) underlayer - Cu2O composite photocathode for PEC water splitting. The dendritic gold nanostructures were successfully synthesized by varying reaction time during the electrodep...

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Published in:ECS transactions 2017-01, Vol.80 (10), p.1049-1055
Main Authors: Lan, Tian, Padalkar, Sonal
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Language:English
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description Copper (I) oxide (Cu2O) is a promising photocathode for photoelectrochemical (PEC) water splitting. Here we study gold (Au) underlayer - Cu2O composite photocathode for PEC water splitting. The dendritic gold nanostructures were successfully synthesized by varying reaction time during the electrodeposition process. The Cu2O overlayer was electrodeposited onto Au nanostructures to form Au-Cu2O photocathode. Scanning electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy were used to characterize the Au-Cu2O photocathode. Additionally, the effect of morphology variation and possible growth mechanism of Au underlayer was evaluated. The photocurrent density of Au-Cu2O photocathode reached up to 3 mA cm−2, which is 2.5 times greater than that of control Cu2O photocathode (1.25 mA cm−2) at 0 V vs RHE.
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title Exploring the Influence of Au Underlayer Thickness on Photocathode Performance
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