scholarly journals Synthesis of Ni- and N-Doped Titania Nanotube Arrays for Photocatalytic Hydrogen Production from Glycerol–Water Solutions

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1234
Author(s):  
Tiur Elysabeth ◽  
Dwi Annisa Agriyfani ◽  
Muhammad Ibadurrohman ◽  
Muhammad Nurdin ◽  
Slamet

Synthesis of Ni- and N-doped Titania Nanotube Arrays (Ni-N-TiNTAs) was conducted to produce photocatalysts for hydrogen production from a glycerol–water mixture. Ni-N-TiNTAs were synthesized in two steps, namely anodization and chemical reduction. Ti foil was anodized at 50 V for two h in an electrolyte solution containing 0.2% urea as a source of N atoms. Ni doping (at various content of 5%, 10%, 15%, and 20% wt) was performed by one-hour chemical reduction with sodium borohydride as a reducing agent. The photocatalyst was annealed at different temperatures, i.e., 500 °C, 550 °C, and 600 °C under 60 mL/min N2 gas for two h. On the basis of X-ray Diffraction (XRD) patterns, Ni-N-TiNTAs are mostly of anatase crystallite phase when annealed at 500 °C and 550 °C, while that of rutile was observable when calcination was done at 600 °C. The morphology of the photocatalysts was scrutinized by means of Field Emission Scanning Electron Microscopy (FESEM) imaging, which reveals nanotubular structures, with elemental composition measured by Energy Dispersive X-ray (EDX). The bandgap of the photocatalysts was analyzed using Ultraviolet Diffuse Reflectance Spectroscopy (UV DRS), which showed a lower value for the case of Ni-N-TiNTAs as compared to those of TiNTAs and N-TiNTAs. Photocatalytic tests showed that the highest amount of hydrogen produced (ca. 30973 μmol/m2) was obtained in the case of Ni-N-TiNTAs with a Ni content of 10wt%.

2011 ◽  
Vol 28 (5) ◽  
pp. 1196-1199 ◽  
Author(s):  
Sang-Sun Park ◽  
Seon-Mi Eom ◽  
Masakazu Anpo ◽  
Dong-Ho Seo ◽  
Yukwon Jeon ◽  
...  

2008 ◽  
Vol 20 (14) ◽  
pp. 1213-1215 ◽  
Author(s):  
Jianling Zhao ◽  
Xixin Wang ◽  
Yingru Kang ◽  
Xuewen Xu ◽  
Yangxian Li

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 338 ◽  
Author(s):  
Fabián M. Martínez ◽  
Elim Albiter ◽  
Salvador Alfaro ◽  
Ana L. Luna ◽  
Christophe Colbeau-Justin ◽  
...  

Coupling metal-organic frameworks (MOFs) with inorganic semiconductors has been successfully tested in a variety of photocatalytic reactions. In this work we present the synthesis of TiO2/HKUST-1 composites by grinding, solvothermal, and chemical methods, using different TiO2 loadings. These composites were used as photocatalysts for hydrogen production by the photoreforming of a glycerol-water mixture under simulated solar light. Several characterization techniques were employed, including X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), infrared spectroscopy (FTIR), and time-resolved microwave conductivity (TRMC). A synergetic effect was observed with all TiO2/HKUST-1 composites (mass ratio TiO2/MOF 1:1), which presented higher photocatalytic activity than that of individual components. These results were explained in terms of an inhibition of the charge carrier (hole-electron) recombination reaction after photoexcitation, favoring the electron transfer from TiO2 to the MOF and creating reversible Cu1+/Cu0 entities useful for hydrogen production.


RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50379-50391 ◽  
Author(s):  
Katarzyna Siuzdak ◽  
Mariusz Szkoda ◽  
Mirosław Sawczak ◽  
Anna Lisowska-Oleksiak ◽  
Jakub Karczewski ◽  
...  

The paper discusses the synthesis and performance of iodine doped titania nanotube arrays exhibited under irradiation.


2018 ◽  
Vol 15 (1) ◽  
pp. 57-62
Author(s):  
Baghdad Science Journal

In this work, CdS/TiO2 nanotubes composite nanofilms were successfully synthesized via electrodeposition technique. TiO2 titania nanotube arrays (NTAs) are commonly used in photoelectrochemical cells as the photoelectrode due to their high surface area, excellent charge transfer between interfaces and fewer interfacial grain boundaries. The anodization technique of titanium foil was used to prepare TiO2 NTAs photoelectrode. The concentration of CdCl2 played an important role in the formation of CdS nanoparticles. Field emission scanning electron microscopy (FESEM) shows that the CdS nanoparticles were well deposited onto the outer and inner of nanotube at 40 mM of CdCl2. X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analyses were executed for the determination of the composition and crystalline structure of the synthesized samples. Furthermore, the data of EDX confirms the formation of titanium and oxygen for TiO2 nanotubes and cadmium and sulfide for CdS deposits. UV–visible diffuse reflectance spectroscopy (UV-DRS) displayed that CdS nanoparticle which deposited onto TiO2 NTAs causes a red-shift into the visible region. CdS/TiO2 NTAs sample prepared at 40 mM of CdCl2 showed maximum photocurrent of 1.745 mA cm-2 while the bare TiO2 NTAs showed 0.026 mA cm-1.


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