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Investigating the kinetic mechanism of the oxygen reduction reaction in non-aqueous solvente

Grant number: 14/15798-0
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): September 15, 2014
Effective date (End): September 14, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal researcher:Fritz Cavalcante Huguenin
Grantee:Nelson Alexandre Galiote Silva
Supervisor abroad: Stefano Passerini
Home Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Research place: Karlsruhe Institute of Technology (KIT), Germany  
Associated to the scholarship:11/12668-0 - Nanoparticulate Materials for Lithium-air Batteries, BP.DR


Due to their high theoretical energy density, lithium-air batteries represent a promising substitute for the state-of-art lithium ion batteries when it comes to energy storage and conversion. However, practical systems have not yet achieved the expected high energy density due to solvent instability, low reactions rates, and chemical irreversibility during the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Because the role that the addition of a catalyst plays in the ORR mechanism is not fully understood, this project proposes investigating the ORR mechanism using an electrocatalyst that consist of platinum and carbon nanoparticles, focusing on how the electrocatalyst grain size influences this mechanism. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Raman, and electrochemical experiments shall help to elucidate which species participate in ORR catalysis. Such analyzes will complement to the electrochemical impedance spectroscopy data and aid proposal of a kinetic model for these systems. These strategies will assist catalyst development by providing information about how electrode type and catalyst grain size affect the reaction mechanism. (AU)

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Scientific publications
(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)
GALIOTE, NELSON A.; ULISSI, ULDERICO; PASSERINI, STEFANO; HUGUENIN, FRITZ. Role Platinum Nanoparticles Play in the Kinetic Mechanism of Oxygen Reduction Reaction in Nonaqueous Solvents. Journal of Physical Chemistry C, v. 122, n. 28, p. 15826-15834, . (11/12668-0, 14/15798-0, 15/16867-9)
GALIOTE, NELSON A.; JEONG, SANGSIK; MORAIS, WILLIAM G.; PASSERINI, STEFANO; HUGUENIN, FRITZ. The Role of Ionic Liquid in Oxygen Reduction Reaction for Lithium-air Batteries. Electrochimica Acta, v. 247, p. 610-616, . (11/21545-0, 11/12668-0, 14/15798-0)

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