Synthesis of vertically aligned CaTiO₃ nanotubes with simple hydrothermal method and its photoelectrochemical property

Abstract

Perovskite-type oxides have become the hotspots of functional materials due to their various excellent performances. As a typical material with a perovskite structure, CaTiO (CTO) possesses a similar band gap to TiO with less defects and recombination centers, which makes it a promising alternative material to TiO. In particular, the CTO nanotube structure has a large specific surface area and unique photochemical and electron-transport properties, and these advantages further expand its application range. In this paper, a highly ordered and vertically aligned CTO nanotube array was successfully synthesized by a simple hydrothermal method with TiO nanotube (TNT) arrays as the precursor. It was found that the CTO nanotube had a higher optical absorption ability (3.4 eV), photovoltage (500 mV) and photocurrent density (0.004 A cm) under ultraviolet irradiation, compared to the TNT (350 mV and 0.0036 A cm). At the same time, the electrochemical impedance spectroscopy, Mott-Schottky and stability tests indicate that the CTO nanotube might be a promising alternative choice as the photoelectric material for a TNT.

Enhanced Photocatalytic Performance and Mechanism of Au@CaTiO3 Composites with Au Nanoparticles Assembled on CaTiO3 Nanocuboids

“…Calcium titanate (CaTiO 3 ), a typical titanium-contained oxide semiconductor with a perovskite-type structure, has sparked a great interest among researchers owing to its promising properties of ferroelectricity, piezoelectricity, elasticity, and photocatalytic activity [43,44,45,46,47]. As a photocatalyst, CaTiO 3 has been shown to exhibit a pronounced photocatalytic degradation of organic pollutants, as well as photocatalytic splitting of water into hydrogen and oxygen [48,49,50,51,52].…”

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

“…Owing to their diverse physical properties, such as structural flexibility, tunable band gap, low-cost production, electron mobility, and high thermal stability 9 , perovskite materials have been widely used in several applications such as photovoltaic devices, batteries, photodetectors, sensing devices, light emitting diodes, fuel cells, and photocatalysis 4 . Many previous studies have highlighted the properties and applications of several perovskite materials such as SrZrO 3 , SrRuO 3 , CaGeO 3, PbTiO 3 , SrTiO 3, BaTiO 3 , GdFeO 3 and CaTiO 3 10 , 11 . Among these perovskites, Calcium titanate (CaTiO 3 ), has gained much interest due to its remarkable properties of optoelectronic, ferroelectricity, and photocatalytic activity 12 .…”

Microwave-assisted synthesis of defective Ca1−xAgxTi1−yCoyO3 with high photoelectrocatalytic activity for organic pollutant removal from water

“…As the most typical perovskite oxide, 6 CaTiO 3 is a potential photocatalyst in the degradation of organic pollutants because of its highly cost-effective, simple preparation method, high chemical stability and good biocompatibility. 7 CaTiO 3 has a wide band gap of about 3.5 eV and its activity is limited to UV excitation only.…”