New visible-light-driven BiMoO/CsSbBr heterostructure for selective photocatalytic oxidation of toluene to benzaldehyde.

Herein, new BiMoO/CsSbBr heterostructure (BiMo/CSB) was investigated for the first time as a visible-light-driven photocatalyst for C(sp)-H bond activation using molecular oxygen as a green oxidant and toluene as a model substrate. The optimized BiMo/CSB photocatalyst exhibited enhanced toluene oxidation activity (2,346 μmol gh), which was almost two- and five-fold that of pristine CSB (1,165 μmol gh) and BiMo (482 μmol gh), respectively. The improved photocatalytic performance was essentially attributed to the formation of staggered band energy lineup in the BiMo/CSB hybrid, which promoted S-scheme charge transfer across the BiMo/CSB heterointerface as supported by ultraviolet photoelectron spectroscopy (UPS), density functional theoretical (DFT), time-resolve photoluminescence (TRPL), and photoelectrochemical studies.

Bismuth-rich oxyhalide (BiOI-BiOBr) solid-solution photocatalysts for the degradation of phenolic compounds under visible light.

Hypothesis: The development of solid-solution photocatalysts with tunable bandgaps and band structures, which are significant factors that influence their photocatalytic properties, is crucial.

Experiments: We fabricated a series of novel bismuth-rich BiOI-BiOBr solid-solution photocatalysts with controlled I:Br molar ratios (denoted as B-IBr, x  = 0.2, 0.

Lattice dynamic stability and electronic structures of ternary hydrides La Y H first-principles cluster expansion.

Lanthanum hydride compounds LaH become stabilized by yttrium substitution under the influence of moderate pressure. Novel materials with a wide range of changes in the structural properties as a function of hydrogen are investigated by means of the first-principles cluster expansion technique. Herein, the new compounds La Y H, where 0 ≤ ≤ 1, are determined to adopt tetragonal structures under high-pressure with the compositions LaYH, LaYH, and LaYH.

Enhanced photoactivity and selectivity over BiOI-decorated BiWO microflower for selective oxidation of benzylamine: Role of BiOI and mechanism.

The importance of developing effective and selective photocatalytic materials to realize efficient renewable energy-based organic synthetic processes, such as selective oxidation of benzylamines and its derivatives to the corresponding imines has become more apparent in recent years. Here we present the first reported BiOI/BiWO (BI/BW) microflower heterostructure as a visible-light-driven photocatalyst for such reactions. By decorating the hydrothermally prepared BW with BI via successive ionic layer adsorption and reaction (SILAR) method, benzylamine conversion is improved from 68 % to 92 % as compared to undecorated.

Tuning the Dielectric Constant and Surface Engineering of a BaTiO/Porous PDMS Composite Film for Enhanced Triboelectric Nanogenerator Output Performance.

In this work, synergistic effects derived from surface engineering and dielectric property tuning were exploited to enhance the output performance of a triboelectric nanogenerator (TENG) based on an inorganic/porous PDMS composite in a contact-separation mode. BaTiO (BT)/porous PDMS films with different BT weight ratios were fabricated and evaluated for triboelectric nanogenerator (TENG) application. Maximum output signals of ca.

Effect of substitution on the superconducting phase of transition metal dichalcogenide Nb(Se[Formula: see text]S[Formula: see text])[Formula: see text] van der Waals layered structure.

By means of first-principles cluster expansion, anisotropic superconductivity in the transition metal dichalcogenide Nb(Se[Formula: see text]S[Formula: see text])[Formula: see text] forming a van der Waals (vdW) layered structure is observed theoretically. We show that the Nb(Se[Formula: see text]S[Formula: see text])[Formula: see text] vdW-layered structure exhibits minimum ground-state energy. The Pnnm structure is more thermodynamically stable when compared to the 2H-NbSe[Formula: see text] and 2H-NbS[Formula: see text] structures.

Effect of exposed facets of bismuth vanadate, controlled by ethanolamine, on oxidative coupling of primary amines.

This work firstly demonstrates the ethanolamine (ETA)-assisted hydrothermal synthesis of BiVO, with different ratios of exposed {110}/{010} planes and relates this to performance in photocatalytic oxidative coupling of benzylamine under visible light. {110}-dominant BiVO exhibits outstanding photocatalytic activity at room temperature owing to synergistic effects of largely exposed {110}-oxidative facet along with excellent charge generation and migration abilities, as evidenced by X-ray diffraction patterns, electrochemical impedance spectra, and photocurrent responses. The catalyst can successfully transform benzylamine derivatives to corresponding imines with selectivities of >85%, indicating a wide scope of amine substrates that can be used with the developed catalyst.

Influence of the N atom position on the excited state photodynamics of protonated azaindole.

We present a study of the photofragmentation of three protonated azaindole molecules - 7-azaindole, 6-azaindole, and 5-azaindole - consisting of fused pyrrole-pyridine bicyclic aromatic systems, in which the pyridinic (protonated) nitrogen heteroatom is located at the 7, 6, and 5 positions, respectively. Photofragmentation electronic spectra of the isolated aforementioned azaindolinium cations reveal that their photodynamics extends over timescales covering nine orders of magnitude and provide evidence about the resultant fragmentation pathways. Moreover, we show how the position of the heteroatom in the aromatic skeleton influences the excited state energetics, fragmentation pathways, and fragmentation timescales.

Oxygen-deficient bismuth molybdate nanocatalysts: Synergistic effects in boosting photocatalytic oxidative coupling of benzylamine and mechanistic insight.

Herein, bismuth molybdate (BiMoO) nanocatalysts containing oxygen vacancies (OVs) are found to considerably promote the photocatalytic performance toward oxidative coupling of benzylamine to N-benzylidenebenzylamine under visible light irradiation. The structure-activity relationship for this interesting catalyst is revealed for the first time. The oxygen-deficient BiMoO nanoplatelets (BMO-NPs) are synthesized using ethylene glycol-ethanol solvent mixture as a reaction medium in solvothermal method.

Visible-light-driven WO/BiOBr heterojunction photocatalysts for oxidative coupling of amines to imines: Energy band alignment and mechanistic insight.

The visible-light-driven WO/BiOBr heterojunction was for the first time determined for its photocatalytic activity toward oxidative coupling of amines at room temperature using molecular oxygen as a green oxidant. The WO/BiOBr heterojunction exhibits superior photocatalytic activity and photostability compared with pure BiOBr and WO due to an increased oxygen vacancy concentration, an effective separation of photogenerated electron-hole pairs and an efficient interfacial charge transfer. Additionally, the WO/BiOBr also shows 2.

Pressure-Induced Formation of Quaternary Compound and In-N Distribution in InGaAsN Zincblende from Ab Initio Calculation.

We present the effects of In-N distribution and high pressure on the zincblende phase (0-5 GPa) of In Ga AsN (=0.074, 0.111 and 0.

Low temperature preparation of oxygen-deficient tin dioxide nanocrystals and a role of oxygen vacancy in photocatalytic activity improvement.

The introduction of oxygen vacancies (V) into tin dioxide crystal structure has been found as an effective method to improve its photocatalytic performance. Herein, oxygen-deficient tin dioxide (SnO) nanocrystals were successfully prepared via a facile, one-step hydrothermal method at the temperature lower than those reported previously. The effect of hydrothermal temperature on phase composition and V content was also firstly investigated.

Visible light photocatalytic performance and mechanism of highly efficient SnS/BiOI heterojunction.

Novel SnS/BiOI heterostructures with excellent photocatalytic degradation of methyl orange were successfully prepared by a facile hydrothermal-coprecipitation method. The maximum methyl orange degradation activity under visible light irradiation (λ>400nm) was found for 10wt% SnS/BiOI. The composite also showed better stability and good recyclability compared to BiOI.

CoTiO3/Ag3VO4 composite: A study on the role of CoTiO3 and the active species in the photocatalytic degradation of methylene blue.

The role of CoTiO3 and the possible active species in the methylene blue (MB) degradation over the visible-light-driven CoTiO3/Ag3VO4 catalyst have firstly been investigated in this work. CoTiO3 is found to play important roles in enhancing the visible light-harvesting ability of the composite and increasing electron-hole separation efficiency due to the hybrid effect between Ag3VO4 and CoTiO3. The indirect probe experiments reveal that CoTiO3/Ag3VO4 heterostructure provides large amount of active species, therefore a high photocatalytic activity could be obtained.

Enhanced visible-light photocatalytic activity of g-C3N4/TiO2 films.

Enhanced photocatalytic degradation of methylene blue (MB) using graphitic carbon nitride/titanium dioxide (g-C3N4/TiO2) catalyst films has been demonstrated in this present work. The g-C3N4/TiO2 composites were prepared by directly heating the mixture of melamine and pre-synthesized TiO2 nanoparticles in Ar gas flow. The g-C3N4 contents in the g-C3N4/TiO2 composites were varied as 0, 20, 50 and 70 wt%.

BiVO(4)/CeO(2) nanocomposites with high visible-light-induced photocatalytic activity.

Preparation of bismuth vanadate and cerium dioxide (BiVO4/CeO2) nanocomposites as visible-light photocatalysts was successfully obtained by coupling a homogeneous precipitation method with hydrothermal techniques. The BiVO4/CeO2 nanocomposites with different mole ratios were synthesized and characterized by X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Absorption range and band gap energy, which are responsible for the observed photocatalyst behavior, were investigated by UV-vis diffuse reflectance (UV-vis DR) spectroscopy.

Selective catalytic reduction of O2 with excess H2 in the presence of C2H4 or C3H6.

The selective reduction of molecular oxygen with excess H(2) in the presence of alkenes was achieved successfully for the first time: silver supported on alumina catalysts exhibited full conversion of O(2) at temperature as low as 50 degrees C, while the conversion of ethene or propene remained essentially zero up to 250 degrees C.