Preparation and Photoelectrocatalytic Performance of CuO/V2O5/FTO Composite Nanofibers Electrode†

doi:10.7503/cjcu20160428

Abstract

Abstract:

CuO/V₂O₅/FTO composite nanofibers photoelectrode was fabricated by electrospinning method with polyvinyl pyrrolidone(PVP) as fiber skeleton, copper(Ⅱ) nitrate hydrate and vanadium(Ⅳ)-oxy acetylacetonate as raw materials. The structure of the samples was characterized by thermogravimetry-differential thermal analysis(TG-DTA), X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electronic microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). The photoelectrocatalytic performance of the samples was analyzed by the degradation of methylene blue(MB) solution. The results show that the heterojunctions between CuO and V₂O₅ were formed, and the separation of photogenerated electron-hole pairs on CuO/V₂O₅/FTO was promoted, which made the degradation rate of MB catalyzed by CuO/V₂O₅/FTO much higher than that catalyzed by pure V₂O₅/FTO. The different molar ratios of n(Cu)/n(V) had influence on photoelectrocatalytic activity, and the CuO/V₂O₅/FTO with n(Cu)/n(V)=1∶1 had the highest catalytic activity(degradation rate of MB was 96%).

Key words: Electrospinning, CuO/V2O5/FTO, Composite Nanofibers, Photoelectrocatalysis

CLC Number:

O643

TrendMD:

LIN Xiao, LI Youji, LI Ming, TANG Ningmei, LI Ziqin, HAN Zhiying. Preparation and Photoelectrocatalytic Performance of CuO/V₂O₅/FTO Composite Nanofibers Electrode^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2246.

Figures/Tables 9

Fig.1 Schematic of the fabrication of precursor fibers by electrospinning

Fig.2 Schematic of photoelectrocatalytic degradation apparatus

Fig.3 TG-DTA of VC-1 precursor fibers

Fig.4 XRD patterns of pure V2O5 and CuO/V2O5 with different molar ratiosn(V)/n(Cu): a. 1∶0; b. 4∶1; c. 2∶1; d. 1∶1; e. 1∶2; f. 1∶4.

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

Fig.6 XPS spectra of pure V2O5(a) and VC-1(b)(A) Full spectrum; (B) V2p; (C) Cu2p; (D) O1s.

Fig.7 FTIR spectra of pure V2O5(a) and CuO/V2O5(b—f) with different molar ratiosn(V)/n(Ti): b. 4∶1; c. 2∶1; d. 1∶1; e. 1∶2; f. 1∶4.

Fig.8 Effects of degradation time on MB degradation remnant rate and ln(c0/c) of different catalysta. V2O5. n(V)/n(Cu): b. 4∶1; c. 2∶1; d. 1∶1; e. 1∶2; f. 1∶4. (B) a. y=0.0149x, R2=0.992; b. y=0.0088x, R2=0.999; c. y=0.0073x, R2=0.998; d. y=0.0060x, R2=0.997; e. y=0.0078x, R2=0.996; f. y=0.0103x, R2=0.999.

Fig.9 Recycling performance of VC-1

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Preparation and Photoelectrocatalytic Performance of CuO/V₂O₅/FTO Composite Nanofibers Electrode^†

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