α-Fe2O3/Ti–Nb–Zr–O composite photoanode for enhanced photoelectrochemical water splitting

Liu, Qiang; Ding, Dongyan; Ning, Congqin; Wang, Xuewu

doi:10.1016/j.mseb.2015.02.010

Cited by 16 publications

(5 citation statements)

References 37 publications

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“…The two peaks at binding energies of 184.6 and 182.2 eV corresponded to the Zr 3d 3/2 and Zr 3d 5/2 photoelectron lines. These were indicative of Zr 4+ in the quadrille phase of ZrO 2 , 55 which was consistent with the wide-angle XRD results. The Al 2p peak located at a binding energy of 73.6 eV in Fig.…”

Section: Xps Analysissupporting

confidence: 89%

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Zhang

2020

J of Chemical Tech & Biotech

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BACKGROUND: The zirconium-containing metal-organic framework (MOF) UiO-66 was used as a cell to synthesize SO 4 2 − /ZrO 2 @Al 2 O 3 , a high-density superacid with relatively strong Brønsted acidity. The UiO-66 MOF was first coated with alumina to form ZrO 2 @Al 2 O 3. Impregnation with ammonium sulfate and calcination at 500°C afforded the bimetallic composite solid superacid SO 4 2− /ZrO 2 @Al 2 O 3. RESULTS: Scanning and transmission electron microscopy images confirmed that UiO-66 was successfully coated with aluminium oxide, and its octahedral structure and uniform size (400-600 nm) were retained. SO 4 2− /ZrO 2 @Al 2 O 3 had a Brunauer-Emmett-Teller specific surface area of 301-330 m 2 g −1 and average pore diameter of 9.6-10.7 nm. X-ray photoelectron spectroscopy and Fourier transform infrared analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained S 6+ and Al 3+. Temperatureprogrammed ammonia desorption analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained super-strong acid sites. The total volume of desorbed ammonia reached 90-109 cm 3 g −1. Infrared spectra of adsorbed pyridine indicated that SO 4 2− /ZrO 2 @Al 2 O 3 contained mainly Lewis acid sites and was relatively rich in Brønsted acid sites. Thermogravimetric analysis showed that the thermal stability of SO 4 2− /ZrO 2 @Al 2 O 3 was high. CONCLUSIONS: SO 4 2− /ZrO 2 @Al 2 O 3-3M (the impregnation concentration of ammonium sulfate was 3 mol L −1) and glucose were used to synthesize ethyl levulinate (EL) in ethanol. The highest EL yield of 37.5 mol% was obtained after reacting the mixture at 200°C for 5 h. An EL yield of 28.8 mol% was obtained after four consecutive reuses of the SO 4 2− /ZrO 2 @Al 2 O 3-3M catalyst.

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Section: Xps Analysissupporting

confidence: 89%

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Zhang

2020

J of Chemical Tech & Biotech

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“…The at-band potential and donor density of different photoanodes were calculated from the Mott-Schottky equation: 18,38…”

Section: Resultsmentioning

confidence: 99%

“…This kind element doped TiO 2 nanotubes photocatalyst could take advantage of 1D nanotubes to enhance electron transport rates and increase surface area and enhance electron conductivity for improved photocurrent harvest efficiencies. 18,19 More importantly, the band gap of TiO 2 could be narrowed because of the incorporation of impurity elements and then the absorption of visible light could also be improved. Recently, Allam et al fabricated Nb/Zr-doped TiO 2 and Mo/Ni-doped TiO 2 nanotube photoanodes via the anodization of titanium alloys for PEC water-splitting.…”

Section: Introductionmentioning

confidence: 99%

Reduced N/Ni-doped TiO₂ nanotubes photoanodes for photoelectrochemical water splitting

et al. 2015

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“…Consequently, the dominant phase in the XRD pattern was the orthorhombic Nb 2 O 5 of a mixed Nb−Zr−O oxide instead of the formation of binary oxides. 39,40 Compared to the XRD literature of Nb 2 O 5 , it should be noted that there was a small shift in the peak positions of about 0.3 ο , which can be ascribed to the difference in the structure lattice constants attributed to the embodied secondary metal within the lattice. 41 It is well observed in our study that both oxides and oxynitrides possess an overlapping XRD patterns.…”

Section: Morphological and Structural Propertiesmentioning

confidence: 86%

Niobium–Zirconium Oxynitride Nanotube Arrays for Photoelectrochemical Water Splitting

Salem

Mokhtar

Abdelhafiz

et al. 2020

ACS Appl. Nano Mater.

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We report on the first fabrication of vertically oriented niobium–zirconium oxynitride nanotube arrays and their use as an attractive and robust material for visible-light-driven water oxidation. These nanotube arrays with an average diameter of ∼120 nm and very short length ∼90 nm were synthesized via one-step anodization of Nb–Zr alloy sheet in NH4F-containing electrolytes. Ammonolysis of the nanotubes resulted in narrowing the bandgap energy from 3.23 to ∼2.67 eV. The Nb–Zr oxynitride nanotube arrays showed approximately an enhancement of about 1900% over that reported for thin film electrodes made of niobium oxynitride and 3700% greater than that recorded for nitrogen-doped mesoporous Nb2O5. Mott–Schottky and the valence band XPS analyses revealed the favorable band positions of the fabricated oxynitride nanotubes with respect to the water redox potentials with very high charge carriers density. The photocurrent transient measurements revealed the remarkable stability of the fabricated oxynitride nanotubes.

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α-Fe2O3/Ti–Nb–Zr–O composite photoanode for enhanced photoelectrochemical water splitting

Cited by 16 publications

References 37 publications

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Reduced N/Ni-doped TiO₂ nanotubes photoanodes for photoelectrochemical water splitting

Niobium–Zirconium Oxynitride Nanotube Arrays for Photoelectrochemical Water Splitting

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α-Fe2O3/Ti–Nb–Zr–O composite photoanode for enhanced photoelectrochemical water splitting

Cited by 16 publications

References 37 publications

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Reduced N/Ni-doped TiO2 nanotubes photoanodes for photoelectrochemical water splitting

Niobium–Zirconium Oxynitride Nanotube Arrays for Photoelectrochemical Water Splitting

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Reduced N/Ni-doped TiO₂ nanotubes photoanodes for photoelectrochemical water splitting