Enhancing the photoelectrochemical performance of CuFeO2 photocathode through copper foam substrate with integrating trap light and conductivity

This investigation sought to improve the photoelectrochemical performance of CuFeO2-based photocathodes by integrating copper foam (CF) substrate to leverage enhanced light trapping and electrical conductivity. CuFeO2 powders, synthesized via a hydrothermal method, were deposited onto various substrates including fluorinedoped tin oxide (FTO), smooth copper foil, rough copper foil, and CF, to construct the photocathodes. The CF substrate, characterized by its rough surface and three-dimensional porous architecture, demonstrated a superior capacity for light trapping, substantially augmenting light absorption efficiency. Concurrently, the inherent conductivity of copper facilitated improved carrier collection and transfer rates. Consequently, the CF/CuFeO2 photocathode achieved the highest carrier concentration and the most rapid interfacial electron transport rate among the tested configurations. This resulted in the CF/CuFeO2 photocathode achieving the highest photocurrent density, approximately 3.64 mu A/cm2, which represents a tenfold increase compared to the FTO/CuFeO2 photocathode. Furthermore, the CF/CuFeO2 photocathode showcased notable mechanical and chemical stability, underscoring its potential for enhanced photoelectrochemical applications.