The narrow bandgap of Ag2S quantum dots was used to decorate TiO2 nanotube arrays (TiO2 NTAs) by the successive ionic layer adsorption and reaction (SILAR) method to enhance its photoelectrochemical performance. The micromorphology of the photoanode films prepared by the SILAR under different parameters (including different cycle times, capillary spot sample, and ultrasound-assisted) was systematically analyzed. The photoanode film Ag2S/TiO2 prepared by the SILAR under the ultrasound-assisted method shows Ag2S evenly distributed in TiO2 NTAs. At the same time, the corresponding photoabsorption range has been extended to the visible area, while the photocurrent density and photoconversion efficiency have been increased to ~1.8 mA/cm2 and 0.6%, respectively.
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The authors are grateful for the financial supports of the Beijing Natural Science Foundation (No. 3192013).
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Zheng, X., Liu, S., Gu, Y. et al. Optimization of photoelectrochemical performance of Ag2S/TiO2 interface by successive ionic layer adsorption and reaction. MRS Communications 10, 194–199 (2020). https://doi.org/10.1557/mrc.2020.12