LAUSR

This paper describes a promising film based on the dumbbell‐shaped CaBi2O4 nanostructure that is applied in photoelectrochemical (PEC) water splitting as a photoelectrode for the first time. The morphology and microstructure of CaBi2O4 were characterized in detail. PEC measurements showed that the dumbbell‐shaped CaBi2O4 nanostructure film, on the basis of the optimal hydrothermal time, exhibited higher photoelectrochemical activity, as the photocurrent density reached up to 1.19 mA cm−2. The remarkable PEC performance may stem from excellent light absorbance and efficient charge–hole pair separation and collection. This research indicates that the dumbbell‐like CaBi2O4 nanostructure film has enormous potential in PEC water splitting.