Development and Characterization of New Conductor Materials based on Layered Niobates

• Grant number: 12/15785-0
• Support Opportunities: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): October 01, 2013
• Effective date (End): September 30, 2015
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Vera Regina Leopoldo Constantino
• Grantee: Eduardo Caetano Camilo de Souza
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Materials based on layered niobates have been studied mainly due to the high catalytic activity and selectivity in chemical processes involving heterogeneous catalysis. Although their electrical properties have not been investigated so far, they have potential for many applications, such as electrochemical sensors, lithium battery electrodes, supercapacitors and also in photochemical reactions for biofuels production. The possibility of (i) ion exchange with incorporation and transport of charge carriers in the interlayer region, (ii) exfoliation and (iii) production of nanoscrolls are some particular characteristics of niobates that allow a glance of obtaining new materials with optimized electrochemical properties. In this project, three different types of conductors will be studied: 1) solid acid proton conductors of composition H2M2Nb6O17·H2O (M = K, Rb, Cs) and HNb3O8·H2O (layered hexaniobates and triniobates, respectively), 2) lithium ion conductors of composition Li1+xNb1-xO2 (0

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SOUZA, EDUARDO CAETANO C.; GOODENOUGH, JOHN B.. The origin of grain boundary capacitance in highly doped ceria. Physical Chemistry Chemical Physics, v. 18, n. 8, p. 5901-5904, FEB 28 2016. (12/15785-0)

SOUZA, EDUARDO CAETANO C.. Synthesis, structure and optical properties of layered M4Nb6O17 center dot nH(2)O (M = K, Rb, Cs) hexaniobates. Journal of Alloys and Compounds, v. 820, APR 15 2020. (12/15785-0)

SOUZA, EDUARDO CAETANO C.. Thermal Stability and Spectroscopic Assessment of Bronsted Sites in Solid Acid-Layered Niobates. Journal of Physical Chemistry C, v. 123, n. 40, p. 24426-24435, OCT 10 2019. (12/15785-0)

SOUZA, EDUARDO CAETANO C.. Light-Induced In Situ Oxidative Coupling Mediated by Triplet State Reactive Oxygen into Nanostructured Hexaniobate Photocatalyst. ACS APPLIED NANO MATERIALS, v. 3, n. 8, p. 8483-8494, AUG 28 2020. (12/15785-0)