Fabrication of Au Nanoparticles / Bilayer TiO2 Nanotube Periodical Structure and Electrocatalytic Oxidation of Ethanol

doi:10.15541/jim20150380

Abstract

Abstract:

The bilayer TiO₂ nanotube periodical structure was fabricated by a two-step anodization method. The morphology of this bilayer TiO₂ nanotube could be controlled by adjusting the tube diameter under different anodizing voltages. The optimized bilayer periodical nanostructure was obtained under a first voltage of 60 V and second voltage of 40 V. Au nanoparticles were then decorated onto the periodical TiO₂ nanotube surface by using in-situ photoreduction. The influences of precursor concentration and irradiation time were investigated. The best morphology and distribution of Au NPs on TiO₂ were obtained in 0.05 mmol/L HAuCl₄solution accompanied by irradiation for 90 min. This green method of in-situ photoreduction greatly enhanced the catalytic activity of Au nanoparticles due to the fact of avoiding reducing and protective agents. As-prepared Au/TiO₂ periodical hetero-nanostructures could be directly used as working electrode and showed good catalytic activity and stability for electrocatalytic oxidation of ethanol. Except for Au nanoparticles, other metal nanoparticles such as Ag, Pd, and Cu could also be decorated onto the bilayer TiO₂ nanotube periodical structure by using this method. This novel hetero-nanostructure shows great potential in application for preparing high efficient anode materials for fuel cell.

Key words: TiO₂ nanotube, Au nanoparticle, photoreduction, ethanol, electrocatalytic oxidation

CLC Number:

O646

JIN Zhao, CHEN Qi-Han, ZHENG Meng-Jia, ZHAO Peng, LI Qian, CUI Xiao-Qiang. Fabrication of Au Nanoparticles / Bilayer TiO₂ Nanotube Periodical Structure and Electrocatalytic Oxidation of Ethanol[J]. Journal of Inorganic Materials, 2016, 31(3): 241-247.

Figures/Tables 8

Table 1 Anodization voltages for TiO2 nanotube fabrication

First time/V	40		50		60
Second time/V	10	20	30	40	50	60

Table 2 Concentration and irradiation time for Au nanoparticles decoration

HAuCl₄ concentration/(mmol·L^-1)	0.01	0.05	0.09
Irradiation time/min	30	90	150

Fig. 1 SEM images (a-c) of TiO2 nanotubes after first anodizing under different voltages and corresponding XRD patterns(a) 40 V; (b) 50 V; (c) 60 V; (d) XRD pattern of Ti and TiO2 nanotubes after annealing

Fig. 2 SEM images (a-f) of TiO2 nanotubes after second anodizing under different voltages and histogram of nanotube diameter (g)(a) 10 V; (b) 20 V; (c) 30 V; (d) 40 V; (e) 50 V; (f) 60 V

Fig. 3 SEM images (a-c) of TiO2 photoreduced in different concentrations of HAuCl4 and corresponding XRD patterns (d)(1) 0.01 mmol/L; (2) 0.05 mmol/L; (3) 0.09 mmol/L

Fig. 4 SEM images (a-c) of TiO2 nanotubes photoreduced in different time and the corresponding CV characterization(a) 30 min; (b) 90 min; (c) 150 min; (d) CV measured in 0.5 mol/L H2SO4; (e) CV measured in KOH and ethanol

Fig. 5 Stability characterization of CV with cycle number of 50 The inset shows the change of peak current vs. the cycle number

Fig. 6 SEM images of TiO2 nanotubes photoreduced in different solutions(a) AgNO3; (b) PdCl2; (c) CuCl2

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Fabrication of Au Nanoparticles / Bilayer TiO₂ Nanotube Periodical Structure and Electrocatalytic Oxidation of Ethanol

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