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Polycyanometalates for mixing entropy batteries


This project involves studies directed to mixing entropy batteries, aiming to produce electrical work from the increased entropy produced by mixing solutions with different salt concentrations. Considering the extensive coastal region and the volume of fluvial water, Brazil has a huge energy reservoir that can be converted into chemical energy. Alkali ions host matrices can be used in the recovery of entropic energy of mixing water from the seas and rivers. The natural water transposition cycle and the low environmental impact generated in this process allow the use of these clean energy sources for sustainable growth. Moreover, this technology can be exploited in organic and wastes from industries and sewage substations.Electrodes based on polycyanometalates with sodium ions storage properties will be synthesized and investigated for application as positive electrode in mixing entropy batteries. Structural changes in Prussian blue are necessary for enhancement of the storage capacity, insertion rate, and stability in different chemical environments. The materials will be investigated from the simulation of electrochemical techniques and by inductively coupled plasma mass spectrometry, cyclic voltammetry, chronopotentiometry, electrochemical impedance spectroscopy, electrochemical microbalance quartz crystal, and scanning electron microscopy. (AU)

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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)
BRAVIN, BRUNO; GOMES, WELLINGTON J. A. S.; HUGUENIN, FRITZ. Energy harvesting by neutralization pseudocapacitor obtained from phosphomolybdic acid and poly(3,4-ethylenedioxythiophene). Journal of Electroanalytical Chemistry, v. 765, p. 52-57, MAR 15 2016. Web of Science Citations: 5.
GOMES, WELLINGTON J. A. S.; DE OLIVEIRA, CAINA; HUGUENIN, FRITZ. Energy Harvesting by Nickel Prussian Blue Analogue Electrode in Neutralization and Mixing Entropy Batteries. Langmuir, v. 31, n. 31, p. 8710-8717, AUG 11 2015. Web of Science Citations: 13.
GALIOTE, NELSON A.; DE AZEVEDO, DAYSE C.; OLIVEIRA, JR., OSVALDO N.; HUGUENIN, FRITZ. Investigating the Kinetic Mechanisms of the Oxygen Reduction Reaction in a Nonaqueous Solvent. Journal of Physical Chemistry C, v. 118, n. 38, p. 21995-22002, SEP 25 2014. Web of Science Citations: 7.
FACCI, TIAGO; GOMES, WELLINGTON J. A. S.; BRAVIN, BRUNO; ARAUJO, DIOGENES M.; HUGUENIN, FRITZ. Proton Electroinsertion in Self-Assembled Materials for Neutralization Pseudocapacitors. Langmuir, v. 30, n. 1, p. 426-431, JAN 14 2014. Web of Science Citations: 10.

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