Morphology-controlled Preparation and Photocatalytic Properties of Cu2O/ZnO Microstructures†

doi:10.7503/cjcu20160502

Abstract

Abstract:

The cuprous oxide/zinc oxide(Cu₂O/ZnO) microstructure were prepared by a mild solution strategy. The integration of polymorphic Cu₂O with wurtzite ZnO is a facile approach of elevating photocatalytic activity toward methyl orange degradation. The morphology and photocatalytic activity were investigated by adjusting Cu²⁺/Zn²⁺ ratio. Nearly 77.5% of methyl orange was photodegradated over Cu₂O/ZnO photocatalyst after 5.5 h light irradiation. The potential photodegradation mechanism was demonstrated by designing a pseudo cell comprised of polymorphic Cu₂O/ZnO anode, Pt counter electrode and sandwiched methyl orange solution.

Key words: Photocatalyst, Polymorphology, Cu₂O/ZnO microstructure, Methyl orange

CLC Number:

O644
O614.1

TrendMD:

LI Ru, YU Liangmin, YAN Xuefeng, JIANG Tao. Morphology-controlled Preparation and Photocatalytic Properties of Cu₂O/ZnO Microstructures^†[J]. Chem. J. Chinese Universities, 2017, 38(2): 267.

Figures/Tables 12

Fig.1 Experimental setup used for photocatalytic experiments1. Cooling water nozzle; 2. snorkel; 3. reactor; 4. magnetic force stirrer; 5. insert type long Hg lamp; 6. quartz cool trap; 7. condensation tube; 8. sample tap; 9. reactor stand.

Fig.2 SEM images of Cu2O/ZnO photocatalysts synthesized at various [Cu2+]/[Zn2+] ratios[Cu2+]/[Zn2+]: (A) 1:0.025; (B) 1:0.05; (C) 1:0.15; (D) 1:0.18; (E) 1:0.25; (F) 1:0.30; (G) 1:0.40;(H) 1:0.50; (I) 1:1.00.

Fig.3 HRTEM image(A) and the corresponding FFT pattern(B) of Cu2O/ZnO microstructure synthesized at [Cu2+]/[Zn2+]=1:0.50

Fig.4 XRD patterns of the pristine Cu2O and various Cu2O/ZnOa. Zn2O; b. Cu2O; c. Cu2O/ZnO-1:0.025; d. Cu2O/ZnO-1:0.05; e. Cu2O/ZnO-1:0.015; f. Cu2O/ZnO-1:0.25; g. Cu2O/ZnO-1:0.50; h. Cu2O/ZnO-1:1.10.

Table 1 Structural parameters extracted from XRD patterns and photocatalytic results of different photocatalysts

Sample	β	2θ/(°)	Crystallite size/nm	Δd/d	S_BET/(m²·g^-1)	Degradation rate(%)	R²
Cu₂O	0.0029	36.46	49.82	0.0022		37.3±0.1	0.989
ZnO						38.0±0.2	0.955
Cu₂O/ZnO-1:0.025	0.0025	36.48	57.79	0.0019	2.12	33.2±0.1	0.969
Cu₂O/ZnO-1:0.05	0.0027	36.48	53.51	0.0020	7.61
Cu₂O/ZnO-1:0.15	0.0028	36.55	51.61	0.0021
Cu₂O/ZnO-1:0.25	0.0032	36.56	45.16	0.0024		41.4±0.1	0.936
Cu₂O/ZnO-1:0.30	0.0033	36.55	43.79	0.0025	6.66	41.6±0.1	0.990
Cu₂O/ZnO-1:0.40	0.0034	36.54	42.50	0.0026	43.61	55.0±0.2	0.831
Cu₂O/ZnO-1:0.50	0.0037	36.53	39.05	0.0028	62.11	77.5±0.1	0.806
Cu₂O/ZnO-1:0.80	0.0035	36.51	41.28	0.0027
Cu₂O/ZnO-1:1.00	0.0025	36.48	57.79	0.0019	61.54	30.5±0.2	0.911

Fig.5 XPS survey spectra(A) and Cu2p XPS spectra(B) for bare Cu2O(a) and Cu2O/ZnO-1:0.50(b)

Fig.6 UV-Vis diffuse reflectance spectra of bare Cu2O particles(a) and Cu2O/ZnO-1:0.50(b)

Fig.7 Determination of the band gap energy of pure ZnO(A), pure Cu2O(B), and Cu2O/ZnO synthesized at [Cu2+]/[Zn2+]=1:0.05(C), 1:0.15(D), 1:0.30(E), 1:0.50(F), 1:1.0(G)

Fig.8 A-t(A) and -ln(c/c0)-t(B) plots for the photodegradation of MO over different photocatalysts

Fig.9 Schematic diagram for the potential photocatalytic mechanism by Cu2O/ZnO

Fig.10 Schematic of a pseudo cell for MO degradation by Cu2O/ZnO photocatalyst

Fig.11 Transient photocurrent responses(A) and Bode EIS plots(B) of pseudo cells with different Cu2O/ZnO photoanodes a. Cu2O/ZnO-1:0.25; b. Cu2O/ZnO-1:0.30; c. Cu2O/ZnO-1:0.40; d. Cu2O/ZnO-1:0.50; e. Cu2O/ZnO-1:0.80; f. Cu2O/ZnO-1:1.00.

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Morphology-controlled Preparation and Photocatalytic Properties of Cu₂O/ZnO Microstructures^†

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