Synergistic effect of titanium oxide underlayer and interlayer on zirconium-doped zinc ferrite photoanode for photoelectrochemical water splitting
International Journal of Hydrogen Energy(2022)
摘要
Here, we report the synergistic effect of dual TiO2 layers to enhance the PEC performance of Zirconium-doped zinc ferrite (ZZFO) photoanode by improving the charge carrier density and suppressing the photogenerated charge recombination. The TiO2 underlayer works as a blocking layer to remarkably suppress the back-injection of electrons from the fluorine-doped tin oxide (FTO) leading to reducing the bulk charge recombination. While interlayer TiO2 improves the bulk charge transfer property of ZZFO photoanodes. The optimal TiO2 double-layer modified ZZFO photoanode exhibits an enhanced photocurrent of 0.435 mA/cm2 at 1.23 V vs. reversible hydrogen electrode (RHE), which is 2.5 times higher than that of the ZZFO photoanode. The effect of each layer was deeply investigated by electrochemical impedance spectroscopy (EIS), intensity-modulated photocurrent spectroscopy (IMPS) and time-resolved photoluminescence studies (TRPL) with the aim of gaining a clear picture of the interface modifications and their impact on the efficiency of the ZZFO photoanode.
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关键词
TiO2 double-layer,Spin coating,Ti4+ diffusion,Photoelectrochemical cells
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