Publication date: 27th March 2025
I will discuss recent advances in our lab with cuprous oxide for solar water splitting. I will mainly focus on thin film Cu2O but will touch briefly on particulate systems as well. The use of selective contacts enables our high quality thermally oxidized p-type Cu2O to be used as both a photocathode and a photoanode. For Cu2O photocathodes, we can achieve > 8 mA/cm2 at +0.2 V vs. RHE for the hydrogen evolution reaction, and for Cu2O photoanodes, we can achieve > 8 mA/cm2 at +1.1 V vs. RHE for the oxygen evolution reaction. Artificial leaf-type architectures will be presented that carry out one of the water splitting reactions coupled with a value-added reaction. We are translating our thin film architectures to particulate systems. We have combined Cu2O hydrogen evolving particles with oxygen evolving particles composed of other materials and we achieve overall water splitting with only light input, albeit with low efficiency and stability for now. An outlook on further development with this material will be presented.
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