ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis of LiNbO₃ nanocrystals by microwave-assisted hydrothermal method: formation mechanism and application to hydrogen evolution reaction

Vinicius G. Deon, Anderson Thesing, Luiza R. Santana, Vanize C. Costa, Maurício O. Vaz, Ricardo M. Silva, Marcia F. Mesko, and Neftali L. V. Carreno

Engenharia Mecânica, Instituto Federal de Santa Catarina – Campus Xanxerê, Xanxerê, Brazil

E-mail: neftali@ufpel.edu.br

Received: 10 November 2020  Accepted: 18 March 2021

Abstract:

Lithium niobate (LiNbO₃) is an important ferroelectric material with a wide range of applications. In this work, the use of microwave radiation to improve the conditions of hydrothermal synthesis of pure nanocrystalline LiNbO₃ was proposed. The structural characterization showed that nanoparticles of a pure LiNbO₃ phase were synthesized. The scanning electron microscopy and transmission electron microscopy analysis revealed a high-quality nanoparticle with an average diameter of ca. 42 and 65 nm for 2 and 3 h of synthesis time, respectively. These results represent a time-saving using a microwave-assisted hydrothermal method for LiNbO₃ preparation, with excellent quality at the nanometer scale. The nanoparticles were employed as photocatalysts for hydrogen evolution reaction through water splitting, reaching the rate of 10.5 µmol h⁻¹ g⁻¹. It had shown to be a potential candidate for water photolysis due to the small particle size and high crystallinity. Moreover, it also allows the direct and fast synthesis of LiNbO₃ on carbon fiber, multi-walled carbon nanotubes and nanocellulose, which were used as supporting materials for the fabrication of novel nanocomposites.

Keywords: Lithium niobate; Microwave-assisted hydrothermal; Nanoparticles; Synthesis; Nanocomposites

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01616-9

Chemical Papers 75 (8) 3807–3815 (2021)