In this study, the photoelectrochemical performance of Cu2O-based photoanodes is evaluated in terms of photoactivity and stability. The electrodes are based on the p-n junction consisting of Cu2O/Ga2O3on which an Au layer is deposited, followed by the formation of Ni-based co-catalysts. The Au layer increases the light absorption in the entire wavelength range from 300 to 800 nm and leads to upward band bending at the Cu2O/Au interface; thus, more photogenerated hole charges are transported to the electrolytes. The electrodeposited FeNiOxthin layer significantly decreases the overpotential and increases the photoactivity; thus, the photoelectrochemical cell consisting of the Cu2O-based photoanode and platinum yields a photocurrent density of about 5.15 mA cm−2at 1.23 Vvs.RHE with a small dark current density of 16 μA cm−2
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A4A1029237), by the Mid-Career Researcher Program through the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2019R1A2C2009822), and by the Ministry of Trade, Industry and Energy (MOTIE, 2005721, Korea).
© The Royal Society of Chemistry 2020.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)