Preparation and Photoelectrocatalytic Performance of Fe2O3/ZnO Composite Electrode Loading on Conductive Glass†

doi:10.7503/cjcu20170388

Abstract

Abstract:

Using polyvinylpyrrolidone(PVP) and ethanol as fiber skeleton and solvent, respectively, Fe₂O₃/ZnO precursor fibers were prepared by sol-gel method combined with electrospinning technique with zinc acetate [Zn(CH₃COO)₂·2H₂O] and three iron acetylacetonate(C₁₅H₂₁O₆Fe) as raw materials. Fe₂O₃/ZnO/FTO composite photoelectrodes with different Fe/Zn molar ratios were obtained by calcination. The morphologies and chemical components were characterized by thermogravimetry-differential thermal analysis(TG-DTA), X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), and so on. The photoelectrocatalytic performance of the obtained sample was tested by the degradation of methylene blue(MB) solution. The results indicate that the p-n heterojunctions between ZnO and Fe₂O₃ are beneficial for separation of photogenerated electrons and holes, resulting in Fe₂O₃/ZnO/FTO with high catalytic activity in comparsion with ZnO/FTO and Fe₂O₃/FTO. The composite photoelectrodes with different Fe/Zn molar ratios exhibit different photoelectrocatalytic activity. When n(Fe)/n(Zn) is 1:1, the catalytic activity of Fe₂O₃/ZnO/FTO is the optimal, the degradation rate of MB is 97% after 140 min.

Key words: Electrospinning, Fe₂O₃/ZnO/FTO, Composite photoelectrode, Photoelectrocatalysis

TrendMD:

HAN Zhiying, LI Youji, LIN Xiao, WANG Ziyu, LI Ziqin, WANG Hao. Preparation and Photoelectrocatalytic Performance of Fe₂O₃/ZnO Composite Electrode Loading on Conductive Glass^†[J]. Chem. J. Chinese Universities, 2018, 39(4): 771.

Figures/Tables 12

Fig.1 Schematic of the fabrication of photoelectrode by electrospinning

Fig.2 Schematic of photoelectrocatalytic degradation apparatus

Fig.3 TG-DTA curves of FZ-1 precursor fibers

Fig.4 XRD patterns of pure ZnO/FTO, Fe2O3/FTO and Fe2O3/ZnO/FTO with different molar ratiosn(Fe)/n(Zn): a. 0:1; b. 1:4; c. 1:2; d. 1:1;e. 2:1; f. 4:1; g. 1:0.

Table 1 Grain size parameters of different samples

n(Fe)/n(Zn)	ZnO/nm	Fe₂O₃ /nm	n(Fe)/n(Zn)	ZnO/nm	Fe₂O₃ /nm
0:1	27.2	-	2:1	28.0	29.5
1:4	28.2	25.1	4:1	28.5	23.9
1:2	33.6	28.9	1:0	-	29.1
1:1	34.5	33.0

Fig.5 SEM images(A, C) and fiber diameter distributions(B, D) of FZ-1 precursor fibers(A, B) and FZ-1(C, D) and TEM images of FZ-1(E, F)

Fig.6 XPS spectra of F2O3/FTO(a), FZ-1(b) and ZnO/FTO(c)(A) Full spectrum; (B) Fe2p; (C) Zn2p; (D) O1s.

Fig.7 FTIR spectra of pure ZnO/FTO, Fe2O3/FTO and Fe2O3/ZnO/FTO with different molar ratiosn(Fe)/n(Zn): a. 0:1; b. 1:4; c. 1:2; d. 1:1;e. 2:1; f. 4:1; g. 1:0.

Fig.8 Equilibrium adsorption of pure ZnO/FTO, Fe2O3/FTO and Fe2O3/ZnO/FTO with different Fe/Zn molar ratios

Fig.9 Effects of degradation time on MB degradation remnant rate(A) and ln(c0/c) of different catalysts(B)n(Fe)/n(Zn): a. 0:1; b. 1:0; c. 4:1; d. 1:4; e. 2:1; f. 1:2; g. 1:1.

Fig.10 Bandgap energies and conduction and valence band energy levels of ZnO and Fe2O3

Fig.11 Recycling performance of FZ-1

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Preparation and Photoelectrocatalytic Performance of Fe₂O₃/ZnO Composite Electrode Loading on Conductive Glass^†

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