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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Role Platinum Nanoparticles Play in the Kinetic Mechanism of Oxygen Reduction Reaction in Nonaqueous Solvents

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Galiote, Nelson A. [1, 2, 3] ; Ulissi, Ulderico [2, 3] ; Passerini, Stefano [2, 3] ; Huguenin, Fritz [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto, SP - Brazil
[2] HIU, Helmholtzstr 11, D-89081 Ulm - Germany
[3] Karlsruhe Inst Technol, POB 3640, D-76021 Karlsruhe - Germany
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 122, n. 28, p. 15826-15834, JUL 19 2018.
Web of Science Citations: 2

Although lithium oxygen batteries theoretically have high energy density, they are far from becoming viable and practical alternatives to current batteries because the oxygen reduction reaction (ORR) is slow, which limits the applicability of lithium oxygen batteries, and these power sources require suitable catalysts for optimum performance. Understanding the chemical and electrochemical steps involved in the ORR mechanism is mandatory. This work investigates platinum nanoparticles (Pt-nps) dispersed in graphitized carbon as a positive electrode for lithium air batteries, characterizes the materials by cyclic voltammetry and galvanostatic cycling, X-ray diffraction, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and determines the kinetic constants for the reaction mechanism steps with the help of electrochemical impedance measurements and modeling. The electron transfer to oxygen molecules adsorbed onto Pt-nps is the rate-limiting step. Li2O2 is preferentially produced via the electrochemical pathway instead of the chemical disproportionation reaction, leading to a device with improved reversibility and enhanced energy density. (AU)

FAPESP's process: 11/12668-0 - Nanoparticulate Materials for Lithium-air Batteries
Grantee:Nelson Alexandre Galiote Silva
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/15798-0 - Investigating the kinetic mechanism of the oxygen reduction reaction in non-aqueous solvente
Grantee:Nelson Alexandre Galiote Silva
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 15/16867-9 - Neutralization and Mixing Entropy Batteries
Grantee:Fritz Cavalcante Huguenin
Support type: Regular Research Grants