Phase-junction Ag/TiO2 nanocomposite as photocathode for H2 generation

Mohamed, Hemdan S. H.; Rabia, Mohamed; Zhou, Xiuqing; Xu, Qin; Khabiri, Gomaa; Shaban, Mohamed; Younus, Hussein A.; Taha, S.; Hu, Zhi Yi; Liu, Jing; Su, Bao‐Lian

doi:10.1016/j.jmst.2020.12.052

Cited by 58 publications

(43 citation statements)

References 66 publications

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“…This behavior is consistent with the previously reported studies (Li et al, 2019). The strong absorption in the Visible/IR region and the extension of the bandgap edges are very important for solar energy applications, especially photoelectrochemical hydrogen generation and solar cells (Abdelmoneim et al, 2021;Mohamed et al, 2021;Shaban et al, 2021). Urbach energy (E U ) refers to the disorder in the material and represents the width of the exponential absorption edge Urbach tail of the valence and conduction bands (El Sayed and Shaban, 2015).…”

Section: Optical Spectra and Energy Gap Calculationsupporting

confidence: 91%

Synthesis, Mesomorphic, and Solar Energy Characterizations of New Non-Symmetrical Schiff Base Systems

et al. 2021

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New asymmetrical Schiff base series based on lateral methoxy group in a central core, (E)-3-methoxy-4-(((4-methoxyphenyl)imino)methyl)phenyl 4-alkoxybenzoate (An), were synthesized and their optical and mesomorphic characteristics were investigated. The lateral OCH3group was inserted in the central ring in ortho position with respect to the azomethine linkage. FT-IR, and NMR spectroscopy as well as elemental analyses were used to elucidate their molecular structures. Their mesomorphic behaviors were characterized by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). These examinations indicated that all the designed series were monomorphic and possessed nematic (N) mesophase enantiotropically, except A12 derivative which exhibited monotropic N phase. A comparative study was made between the present investigated series (An) and their corresponding isomers (Bn). The results revealed that the kind and stability of the mesophase as well as its temperature range are affected by the location and special orientation of the lateral methoxy group electric-resistance, conductance, energy-gap, and Urbach-energy were also reported for the present investigated An series. These results revealed that all electrodes exhibit Ohmic properties and electric-resistances in the GΩ range, whereas the electric resistance was decreased from 221.04 to 44.83 GΩ by lengthening the terminal alkoxy-chain to n = 12. The band gap of the An series was reduced from 3.43 to 2.89 eV by increasing the terminal chain length from n = 6 to n = 12 carbons. Therefore, controlling the length of the terminal chain can be used to improve the An series’ electric conductivity and optical absorption, making it suitable for solar energy applications.

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Section: Optical Spectra and Energy Gap Calculationsupporting

confidence: 91%

Synthesis, Mesomorphic, and Solar Energy Characterizations of New Non-Symmetrical Schiff Base Systems

et al. 2021

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“…After Au coating, the J ph value becomes stable at about 0.07 mA·cm −2 , Figure 9 b. These values indicate the TiN and Au coating materials have high stability and anticorrosion properties that maintain the produced J ph at the same values with time [ 13 , 61 ]. This means that every small change in the produced J ph value refers to a small corrosion reaction due to the acidity of the sewage water.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous TiN/TiO2/Alumina Membrane for Photoelectrochemical Hydrogen Production from Sewage Water

et al. 2021

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An aluminum oxide, Al2O3, template is prepared using a novel Ni imprinting method with high hexagonal pore accuracy and order. The pore diameter after the widening process is about 320 nm. TiO2 layer is deposited inside the template using atomic layer deposition (ALD) followed by the deposition of 6 nm TiN thin film over the TiO2 using a direct current (DC) sputtering unit. The prepared nanotubular TiN/TiO2/Al2O3 was fully characterized using different analytical tools such as X-ray diffraction (XRD), Energy-dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM), and optical UV-Vis spectroscopy. Exploring the current-voltage relationships under different light intensities, wavelengths, and temperatures was used to investigate the electrode’s application before and after Au coating for H2 production from sewage water splitting without the use of any sacrificing agents. All thermodynamic parameters were determined, as well as quantum efficiency (QE) and incident photon to current conversion efficiency (IPCE). The QE was 0.25% and 0.34% at 400 mW·cm−2 for the photoelectrode before and after Au coating, respectively. Also, the activation energy was 27.22 and 18.84 kJ·mol−1, the enthalpy was 24.26 and 15.77 J·mol−1, and the entropy was 238.1 and 211.5 kJ−1·mol−1 before and after Au coating, respectively. Because of its high stability and low cost, the prepared photoelectrode may be suitable for industrial applications.

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“…Urbach energy ( E U ) referred to the width of the exponential absorption edge (the Urbach tail). The tails of the valence and conduction bands are ascribed to the disorder in the material ( Mohamed et al, 2021 ). The exponential dependency of the E U can be determined according to the following equation ( El Sayed and Shaban, 2015 ):

where α 0 is the band tailing parameter that can be obtained by the following equation( Sharma et al, 2014 ):

where c is the speed of light, σ o is electrical conductivity at absolute zero, and Δ E represents the width of the tail of the localized state in the forbidden gap.…”

Section: Resultsmentioning

confidence: 99%

“…This behavior is consistent with the previously reported studies (Mullekom van, 2000). The reduction in the bandgap is very important for solar energy applications, especially photoelectrochemical hydrogen generation and solar cells (Abdelmoneim et al, 2021;Mohamed et al, 2021;Shaban et al, 2021). Urbach energy (E U ) referred to the width of the exponential absorption edge (the Urbach tail).…”

Section: Optical Spectra and Energy Gap Calculationmentioning

confidence: 99%

“…Urbach energy (E U ) referred to the width of the exponential absorption edge (the Urbach tail). The tails of the valence and conduction bands are ascribed to the disorder in the material (Mohamed et al, 2021). The exponential dependency of the E U can be determined according to the following equation (El Sayed and Shaban, 2015):…”

Section: Optical Spectra and Energy Gap Calculationmentioning

confidence: 99%

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Synthesis and Mesomorphic and Electrical Investigations of New Furan Liquid Crystal Derivatives

et al. 2021

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New homologues set liquid crystalline materials, based on furfural derivatives, namely, (E)-4-((furan-2-ylmethylene)amino)phenyl 4-alkoxybenzoate (Fn), were synthesized and investigated for their mesomorphic and optical characteristics. The prepared homologues series constitutes three derivatives that bear different terminal flexible alkyl chain lengths that vary between 6 and 12 carbons and attached to the phenyl ring linked to the ester group. A furfural moiety is introduced into the other terminal of the molecular structure. Mesomorphic characterizations of the prepared derivatives were measured using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Molecular structures were elucidated via elemental analyses, FTIR, and NMR spectroscopy. DSC and POM showed that all the synthesized furfural derivatives are purely nematogenic, exhibiting an enantiotropic nematic (N) mesophase, except for the longest chain derivative (F12) that is dimorphic possessing a monotropic smectic A phase and an enantiotropic N mesophase. Results indicated that the incorporation of the heterocyclic furfural ring into the molecular skeleton affected both the mesophase range and stability of investigated homologue. Analysis of the optical properties revealed that the shortest chain compound (F6) possesses two direct band gaps, at 2.73 and 3.64 eV, in addition to higher absorption than the higher homologues, F10 and F12. On the other hand, all the synthesized homologues (Fn) showed Ohmic behaviors, with electric resistances in the GΩ range. The values of the electrical resistances are 103.71, 12.91, and 196.85 GΩ at 0.05 V for F6, F10, and F12, respectively.

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Phase-junction Ag/TiO2 nanocomposite as photocathode for H2 generation

Cited by 58 publications

References 66 publications

Synthesis, Mesomorphic, and Solar Energy Characterizations of New Non-Symmetrical Schiff Base Systems

Synthesis, Mesomorphic, and Solar Energy Characterizations of New Non-Symmetrical Schiff Base Systems

Nanoporous TiN/TiO2/Alumina Membrane for Photoelectrochemical Hydrogen Production from Sewage Water

Synthesis and Mesomorphic and Electrical Investigations of New Furan Liquid Crystal Derivatives

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