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He, Huichao,Zhang, Yunhuai,Xiao, Peng,Yang, Yannan,Lou, Qing,Yang, Fei Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Ni nanoparticles-$TiO_2$ nanotube arrays (Ni/$TiO_2NTs$) composites were prepared by pulsed electrodeposition method and subsequently characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The FESEM results showed that highly dispersed Ni nanoparticles were not only loaded on the top of the $TiO_2NTs$ but also within the tubular structure, and the particle size of Ni prepared at different current amplitude (100, 200 and 300 $mA{\cdot}cm^{-2}$) was in the range of 15 to 70 nm. The electrochemical studies indicated that Ni nanoparticles loaded on the highly ordered $TiO_2NTs$ are readily accessible for electrochemical reactions, which improve the efficiency of the Ni nanoparticles and $TiO_2NTs$. A maximum specific capacitance (27.3 $mF.cm^{-2}$) was obtained on the Ni/$TiO_2NTs$ composite electrode that prepared at a current of 200 $mA.cm^{-2}$, and the electrode also exhibited excellent electrochemical stability.
Huichao He,Yunhuai Zhang,Peng Xiao,Yannan Yang,Qing Lou,Fei Yang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Ni nanoparticles-TiO2 nanotube arrays (Ni/TiO2NTs) composites were prepared by pulsed electrodeposition method and subsequently characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The FESEM results showed that highly dispersed Ni nanoparticles were not only loaded on the top of the TiO2NTs but also within the tubular structure, and the particle size of Ni prepared at different current amplitude (100, 200 and 300 mA·cm−2) was in the range of 15 to 70 nm. The electrochemical studies indicated that Ni nanoparticles loaded on the highly ordered TiO2NTs are readily accessible for electrochemical reactions, which improve the efficiency of the Ni nanoparticles and TiO2NTs. A maximum specific capacitance (27.3 mF.cm−2) was obtained on the Ni/TiO2NTs composite electrode that prepared at a current of 200 mA.cm−2, and the electrode also exhibited excellent electrochemical stability.
Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO2 Nanotubes Aggregation
Feila Liu,Lu Lu,Peng Xiao,Huichao He,Lei Qiao,Yunhuai Zhang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Aggregation of titania nanotubes (TNTs) fabricated by hydrothermal method were calcined in air and dry nitrogen; Changes in morphology and crystallinity of the nanotubes were studied by means of TEM, EDX, and XPS. EDX patterns and XPS spectra proved that there were a certain densities of oxygen vacancies in TNTs annealed in N2. The photocatalysis experiments revealed TNTs/N2 possesses significantly higher photocatalytic efficiency than TNTs annealed in dry air to degrade methylene blue. The correlation between oxygen vacancies and photocatalytic property may be attributed to: 1) oxygen vacancies might have affected results on water molecules adsorption and increase of the hydroxyl concentration; and 2) oxygen vacancies resulted in some changes in electronic structure of TNTs/N2 aggregation and Fermi level extends into the conducting band.
Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO<sub>2</sub> Nanotubes Aggregation
Liu, Feila,Lu, Lu,Xiao, Peng,He, Huichao,Qiao, Lei,Zhang, Yunhuai Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Aggregation of titania nanotubes (TNTs) fabricated by hydrothermal method were calcined in air and dry nitrogen; Changes in morphology and crystallinity of the nanotubes were studied by means of TEM, EDX, and XPS. EDX patterns and XPS spectra proved that there were a certain densities of oxygen vacancies in TNTs annealed in $N_2$. The photocatalysis experiments revealed TNTs/$N_2$ possesses significantly higher photocatalytic efficiency than TNTs annealed in dry air to degrade methylene blue. The correlation between oxygen vacancies and photocatalytic property may be attributed to: 1) oxygen vacancies might have affected results on water molecules adsorption and increase of the hydroxyl concentration; and 2) oxygen vacancies resulted in some changes in electronic structure of TNTs/$N_2$ aggregation and Fermi level extends into the conducting band.