Direct measurement and modeling of spontaneous charge migration across anatase–brookite nanoheterojunctions

Abstract

Nanocomposites are at the heart of the present nanotechnology revolution in several strategic fields, including Green Chemistry, sensors and pollutant remediation. The promising and extensively examined nanotitania photocatalysts have performances...

Construction of TiO2(B)/Anatase Heterophase Junctions via a Water-Induced Phase Transformation Strategy for Enhanced Photocatalytic Hydrogen Production

“…Photocatalytic water splitting for H 2 production using solar energy and semiconductor photocatalysts is considered one of the most promising technologies to solve the increasingly serious environmental and energy-related issues. − Titanium dioxide (TiO 2 ) has been extensively studied as a model photocatalyst for water splitting owing to its suitable band positions, high chemical stability, low toxicity, and abundant availability. , However, due to the easy recombination of photogenerated charge carriers, the efficiency of TiO 2 in photocatalytic H 2 production is still far from satisfactory. , Numerous strategies have, therefore, been explored to increase the separation efficiency of photoinduced electron–hole pairs within TiO 2 . − Among them, constructing heterophase junction is well accepted to be a pretty effective way since differences between the energy band structures of the components of a heterophase junction exist, which generate strong driving force for charge transfer across the well-matched interfaces. , Without the need to introduce extrinsic elements or other semiconductors, the fabrication of TiO 2 -based heterophase junction has drawn substantial interest from the scientific community. , The past years witness significant advances in the development of TiO 2 -based heterophase junctions and investigation of their photocatalytic properties. A series of TiO 2 -based heterophase junctions, such as anatase/rutile, − anatase/brookite, , TiO 2 (B)/anatase, , brookite/rutile, anatase/rutile/brookite, and anatase/rutile/TiO 2 (B), have been successfully produced. The promoted spatial separation of photogenerated electron–hole pairs and enhanced photocatalytic activity for H 2 production of these heterophase junctions have also been well illustrated.…”

Second Harmonic Generation Behavior of Two New d-Ribose/d-Fructose and Metal Halogenide-Based Coordination Compounds and Comparison to d-Fructose and d-Galactose Analogues: An Experimental and Theoretical Approach

“…A principal component analysis (PCA) was performed to disentangle physical correlations from statistical noise. PCA is a powerful nonparametric tool to extract relevant information from redundant sets of crystallographic and electronic data. , The idea is to apply an orthogonal transformation in a suitably defined hyperspace of physical variables to define new variables, called principal components (PC), that correspond to the eigenvectors of the original variance–covariance matrix. The correlation coefficients between PC and original variables are called loadings .…”

Au Nanoparticles Decorated Graphene-Based Hybrid Nanocomposite for As(III) Electroanalytical Detection

“…As a matter of fact, in addition to the Randles circuit, another circuit has been added in the scheme of the equivalent circuit of hybrid electrodes. This likely originates from the interface region between the C-SPE and the electroactive material [36]. In this case, CPE m and R m are the capacitance and the resistance of the material, respectively.…”