Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The integration of an electrocatalyst (EC) on a semiconductor (SC) photocathode has been considered as a promising architecture design in photoelectrochemical (PEC) water splitting devices. Here, we integrated an electrolyte-permeable, porous structure of NiOx EC on Si photocathodes for an efficient PEC hydrogen evolution reaction (HER) in alkaline electrolyte. We demonstrated that the porous NiOx/Si photocathode reveals intriguing interfacial NiOx/Si energetics, where the built in potential developed by energy-level difference between NiOx and Si is dynamically engineered in-situ during the PEC operation. We found that the built in potential increased as driving the HER, thereby improving the thermodynamic open circuit potential (Voc) as well. As a result, the NiOx/Si photocathode achieves a high Voc of 0.75 V vs. RHE, exceeding the highest value 0.64 V reported to date in conventional Si photocathode. These findings offer insight into a new design of photoelectrochemical device and the potential for use as photocathode in tandem water splitting system
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