Preparation of CNT/Fe-Ni/TiO2/ZnO Arrays Modified Ni Anode and Its Photocatalytic Performance for Hydrogen Evolution†

doi:10.7503/cjcu20140811

Abstract

Abstract:

TiO₂/ZnO nanorode arrays(TiO₂/ZnO NRs) were fabricated on Ni substrate anodes by layer by layer(LBL) method. Fe and Ni doped in the TiO₂ precursor were used as the catalyst to grow carbon nanotubes(CNTs) on TiO₂/ZnO surface by in situ chemical vapor deposition method. The photo-active Ni anode modified by composite photcatalyst of CNT/Fe-Ni/TiO₂/ZnO was obtained. Field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), Raman spectroscopy, electrochemical impedance spectroscopy(EIS) were used to characterized the structure and properties of the modified anodes. The photocatalytic performance of the modified photoactive anode on the decomposition of water for hydrogen evolution was investigated under the irradiation of ultraviolet light. The results showed that the rate of hydrogen evolution on the photoactive anode modified by CNT/Fe-Ni/TiO₂/ZnO increased by 93.7% and 533.0% compared to those on the anodes modified by Fe-Ni/TiO₂/ZnO NRs and sole Ni, respectively.

Key words: Titanium dioxide, Carbon nanotube, Photocatalysis, Hydrogen evolution

CLC Number:

O646

TrendMD:

HE Tiantian, CHEN Aiping, SUN Xiuli, LIN Qizhi, LI Chunzhong. Preparation of CNT/Fe-Ni/TiO₂/ZnO Arrays Modified Ni Anode and Its Photocatalytic Performance for Hydrogen Evolution^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 971.

Figures/Tables 6

Fig.1 FESEM images of different nanostructures assembled on Ni substrate(A) ZnO seeds; (B) ZnO nanorode; (C) Fe-Ni/TiO2/ZnO nanorodes; (D) CNT/Fe-Ni/TiO2/ZnO composite of nanorod and nanotube.

Fig.2 TEM images of different nanostructures assembled on Ni substrate (A) CNT/Fe-Ni/TiO2/ZnO nanocomposite; (B) Fe-Ni/TiO2/ZnO nanorode.

Fig.3 Nyquist plots for ZnO(a), Fe-Ni/TiO2/ZnO(b) and CNT/Fe-Ni/TiO2/ZnO(c) composite thin film modified electrodes

Fig.4 Raman spectrum of CNT/Fe-Ni/TiO2/ZnO composite

Fig.5 Hydrogen evolution of photo-assisted electrolysis of water with different modified Ni anode under ultraviolet light irradiationa. Ni; b. ZnO; c. Fe-Ni/TiO2/ZnO;d. CNT/Fe-Ni/TiO2/ZnO.

Table 1 Results of repeat experiments

Cycle number	Hydrogenproduction(mL·h^-1·cm^-2)
Cycle number	Fe-Ni/TiO₂/ZnO anode	CNT/Fe-Ni/TiO₂/ZnO anode
1	3.63	7.07
2	2.52	7.03
3	2.12	6.69
4	1.23	6.82

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Preparation of CNT/Fe-Ni/TiO₂/ZnO Arrays Modified Ni Anode and Its Photocatalytic Performance for Hydrogen Evolution^†

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