Study on the synthesis of heterojunction Cu2O-BiVO4 catalysts for the photoelectrochemical water splitting

Nguyen Thi Mo; Chau Nguyen; Bach Nguyen

doi:10.62239/jca.2024.085

Authors

Nguyen Thi Mo Hanoi National University of Education Author
Nguyen Minh Chau Hanoi National University of Education Author
Nguyen Minh Bach Hanoi National University of Education Author

DOI:

https://doi.org/10.62239/jca.2024.085

Keywords:

Photoelectrochemical water splitting, Cuprous oxide, Bismuth vanadate

Abstract

Photoelectrochemical water splitting to convert solar energy into chemical energy stored in hydrogen fuel is a challenging task. In this work, BiVO₄ was synthesized by the hydrothermal method. Cu₂O was incorporated with BiVO₄ by the reduction of Cu²⁺ with ascorbic acid on the BiVO₄ particles, varying the Cu:Bi ratio in the reaction and reaction time. The prepared samples were characterized by XRD, SEM and UV-Vis DRS. Cu₂O was formed with a low content and was well dispersed on the surface of BiVO₄. The synthesized Cu₂O-BiVO₄ can absorb radiation in both UV and vision ranges with a wavelength less than 465 nm. The incorporation of Cu2O and BiVO4 can lead to an increase in the photocatalytic performance of the materials with both higher photogenerated current density and dark current density. The 3:10 Cu:Bi ratio in the reaction mixture is considered the optimum ratio for better photoelectrochemical activity of the synthesized catalyst.

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