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Preparation of nanoporous BiVO 4 /TiO 2 /Ti film through electrodeposition for photoelectrochemical water splitting
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A nanoporous BiVO
4
/TiO
2
/Ti film was successfully fabricated by electrodepositing a nanoporous BiOI film on nanoporous TiO
2
arrays followed by annealing at 450°C for 2 h. The electrodeposition of BiOI film was carried out at different times (10, 30, 100, 500 and 1000 s) in Bi(NO
3
)
3
and KI solution. The morphological, crystallographic and photoelectrochemical properties of the prepared BiVO
4
/TiO
2
/Ti heterojunction film were examined by using different characterization techniques. UV–vis spectrum absorption studies confirmed an increase in absorption intensities with increasing electrodeposition time, and the band gap of BiVO
4
/TiO
2
/Ti film is lower than that of TiO
2
/Ti. The photocatalytic efficiency of BiVO
4
/TiO
2
/Ti heterojunction film was higher compared to that of the TiO
2
/Ti film owing to the longer transient decay time for BiVO
4
/TiO
2
/Ti film (3.2 s) than that of TiO
2
/Ti film (0.95 s) in our experiment. The BiVO
4
/TiO
2
/Ti heterojunction film prepared by electrodeposition for 1000 s followed by annealing showed a high photocurrent density of 0.3363 mA cm
−2
at 0.6 V versus saturated calomel electrode. Furthermore, the lowest charge transfer resistance from electrochemical impedance spectroscopy was recorded for the BiVO
4
/TiO
2
/Ti film (1000 s) under irradiation.
Title: Preparation of nanoporous BiVO
4
/TiO
2
/Ti film through electrodeposition for photoelectrochemical water splitting
Description:
A nanoporous BiVO
4
/TiO
2
/Ti film was successfully fabricated by electrodepositing a nanoporous BiOI film on nanoporous TiO
2
arrays followed by annealing at 450°C for 2 h.
The electrodeposition of BiOI film was carried out at different times (10, 30, 100, 500 and 1000 s) in Bi(NO
3
)
3
and KI solution.
The morphological, crystallographic and photoelectrochemical properties of the prepared BiVO
4
/TiO
2
/Ti heterojunction film were examined by using different characterization techniques.
UV–vis spectrum absorption studies confirmed an increase in absorption intensities with increasing electrodeposition time, and the band gap of BiVO
4
/TiO
2
/Ti film is lower than that of TiO
2
/Ti.
The photocatalytic efficiency of BiVO
4
/TiO
2
/Ti heterojunction film was higher compared to that of the TiO
2
/Ti film owing to the longer transient decay time for BiVO
4
/TiO
2
/Ti film (3.
2 s) than that of TiO
2
/Ti film (0.
95 s) in our experiment.
The BiVO
4
/TiO
2
/Ti heterojunction film prepared by electrodeposition for 1000 s followed by annealing showed a high photocurrent density of 0.
3363 mA cm
−2
at 0.
6 V versus saturated calomel electrode.
Furthermore, the lowest charge transfer resistance from electrochemical impedance spectroscopy was recorded for the BiVO
4
/TiO
2
/Ti film (1000 s) under irradiation.
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