Abstract
Photoelectrochemical (PEC) water splitting using photo-active nanomaterials is a promising technique to generate hydrogen in a sustainable way. The charge-transfer and charge separation in photoelectrode are important factors in determining the performance of PECs. Here, we utilize single layer graphene as a photocatalyst on WO3 thin film / Nb:SrTiO3 (100) structure to enhance oxygen evolution reaction in alkaline electrolyte. The graphene-decorated photoelectrodes exhibit efficient charge transfer due to electronic and electrochemical properties of graphene edges, which leads to decreasing onset potential and increasing photo current density from 237 μA/cm2 to 763 μA/cm2 at 1.23 V vs RHE. In addition, such extremely thin layer can protect the photoelectrode from chemical corrosion without disturbing the light absorption. We discuss the role of graphene edges for photoelectrochemical water oxidation. Thus, these results can provide a new route for advanced designs of nanomaterial-based PECs devices. Acknowledgments This research was supported by next generation engineering researcher program of national research foundation of Korea (NRF) funded by the Ministry of Science, ICT (NRF-2019H1D8A2106002).
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