Photoelectrochemical and Photocatalytic Water Splitting with Low-Cost Semiconductors

Cuprous oxide (Cu₂O) is a highly promising material for practical large-scale water splitting due to its low cost, earth abundance, suitable bandgap (2.1 eV), excellent charge transport properties, and ease of synthesis. The main challenge is the stability in aqueous media, which necessitates coating with protective overlayers. In this presentation, I will discuss the fabrication and treatments of cuprous oxide photocathodes for performance enhancement as well as other emerging materials under investigation in our laboratory, such as antimony sulfide (Sb₂S₃). To conclude, I will outline how studies on thin films can contribute to the advancement of photocatalytic particles and particle sheets, representing disruptive potential in the domain of green hydrogen production.