Synergistic modification of Cu3V2O8 nanosheeta photoelectrodes with NiFe and NiOx for efficient and ultra-stable photoelectrochemical water oxidation

Abstract

BACKGROUND

The design and development of environmentally friendly, efficient, and stable photoelectrodes are crucial for advancing photoelectrochemical (PEC) water-splitting technology.

RESULTS

In this study, we report a novel strategy for the preparation of copper vanadate (Cu₃V₂O₈) nanosheet arrays using a low-temperature solution method. Notably, this is the first instance of directly growing Cu₃V₂O₈ nanosheet arrays on FTO (fluorine-doped tin oxide) conductive glass. The morphology of the developed nanosheet arrays offers a larger specific surface area and improved bulk charge separation efficiency, which are desirable characteristics for PEC water-splitting applications. To further enhance the stability and PEC performance of the Cu₃V₂O₈ nanosheets, a synergistic modification strategy was employed. This approach involved the deposition of an NiO_x passivation layer and the incorporation of an NiFe co-catalyst. The synergistic modification strategy significantly improved the PEC performance and stability of the Cu₃V₂O₈ nanosheet arrays. The modified photoelectrode achieved an impressive photocurrent of 0.67 mA cm⁻² at 1.23 V versus a reversible hydrogen electrode and demonstrated stability for over 80 h of operation.

CONCLUSION

This work provides a new, low-cost, and effective strategy for the preparation of efficient and stable photoelectrodes for PEC water splitting, which is a crucial step towards the development of environmentally friendly and sustainable energy technologies. © 2025 Society of Chemical Industry (SCI).