Synthesis and applications of TiO2/ZnO hybrid nanostructures by ZnO deposition on TiO2 nanotubes using electrochemical processes
Author:
Navarro-Gázquez Pedro José1, Muñoz-Portero Maria J.1, Blasco-Tamarit Encarna1, Sánchez-Tovar Rita2, García-Antón José1
Affiliation:
1. Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental (ISIRYM) , Universitat Politècnica de València , Camino de Vera s/n, 46022 Valencia , Spain 2. Departamento de Ingeniería Química, Universitat de Valencia , Av. de las Universitats, s/n, 46100 Burjassot , Spain
Abstract
Abstract
In recent years, TiO2/ZnO hybrid nanostructures have been attracting the interest of the scientific community due to their excellent photoelectrochemical properties. The main advantage of TiO2/ZnO hybrid nanostructures over other photocatalysts based on semiconductor materials lies in their ability to form heterojunctions in which the valence and conduction bands of both semiconductors are intercalated. This factor produces a decrease in the band gap and the recombination rate and an increase in the light absorption range. The aim of this review is to perform a revision of the main methods to synthesise TiO2/ZnO hybrid nanostructures by ZnO deposition on TiO2 nanotubes using electrochemical processes. Electrochemical synthesis methods provide an easy, fast, and highly efficient route to carry out the synthesis of nanostructures such as nanowires, nanorods, nanotubes, etc. They allow us to control the stoichiometry, thickness and structure mainly by controlling the voltage, time, temperature, composition of the electrolyte, and concentration of monomers. In addition, a study of the most promising applications for TiO2/ZnO hybrid nanostructures has been carried out. In this review, the applications of dye-sensitised solar cell, photoelectrocatalytic degradation of organic compounds, photoelectrochemical water splitting, gas sensors, and lithium-ion batteries have been highlighted.
Funder
Ministerio de Ciencia e Innovación and ESF Investing in your future Agencia Estatal de Investigación and the European Social Fund
Publisher
Walter de Gruyter GmbH
Subject
General Chemical Engineering
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