Enhanced Photoelectrochemical Performance of Coaxial-Nanocoupled Strontium-Rich SrTiO₃/TiO₂ {001} Nanotube Arrays

Abstract

The composition of a photocatalyst is the fundamental determinant of its photoability. Recently, significant attention has been focused on the ternary oxide epitaxial overlayers. Here, a highly active {001} facet dominant coaxialnanocoupled SrTiO 3 /TiO 2 nanotube array thin film was fabricated by a modified two-step anodization combined with a hydrothermal process. Through photoelectrochemical (PEC) measurements, such a coaxial-nanocoupled SrTiO 3 /TiO 2 {001} surface reconstruction can definitely improve its PEC performance. The enhanced PEC performance and strongest photocurrent response of SrTiO 3 /TiO 2 nanotubes (STNs) with a 2 h hydrothermal treatment were ascribed to the fast electron transfer in coaxial nanoarchitecture.

Synthesis and Photocatalytic Activity of TiO2/CdS Nanocomposites with Co-Exposed Anatase Highly Reactive Facets

“…The crystallite size of CdS, HF-TiO 2 /CdS, NH 4 F-TiO 2 /CdS, FMA-TiO 2 /CdS, and Urea-TiO 2 /CdS was estimated using Scherrer’s formula [ 35 ], and the average grain size was 37.6 nm, 48.1 nm, 79.2 nm, 74.5 nm, 77.8 nm. The sharp (004) diffraction peak in the TiO 2 /CdS nanocomposites represents the preferential growth of anatase {001} facets [ 36 ]. Compare with HF-TiO 2 /CdS nanocomposites, the (100) diffraction peak of CdS in the NH 4 F-TiO 2 /CdS, FMA-TiO 2 /CdS, and Urea-TiO 2 /CdS nanocomposites is not obvious, because it overlaps greatly with the (101) diffraction peak of anatase TiO 2 in the TiO 2 /CdS nanocomposites [ 21 ].…”

Modification strategies of TiO2 for potential applications in photocatalysis: a critical review

“…Recent reports (51)(52)(53) show that SrTiO 3 (3.4 eV) could effectively improve the charge separation and photoelectrochemical performance of TiO 2 by shifting its Fermi level to more negative potential in the formed SrTiO 3 /TiO 2 heterojunction. Guo et al (54) reported SrTiO 3 /TiO 2 nanosheet heterojunctions prepared via hydrothermal method.…”

Hydrothermal synthesis of Litchi‐like SrTiO3 with the help of ethylene glycol

“…SrTiO 3 is one of the promising candidates for the dielectric and photocatalytic technique because of its high dielectric property, catalytic activity, and good structural stability, which is widely used as ceramic capacitor, varistor, gas sensor, and photocatalytic material. However, the requirements of multifunctional devices increase the attention for the SrTiO 3 crystals considering high purity, low‐dimension, narrow distribution and high active ability.…”