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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.)

Non-Noble Fe-N-x/C Electrocatalysts on Tungsten Carbides/N-Doped Carbons for the Oxygen Reduction Reaction

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do Rego, Ulisses A. [1, 2] ; Lopes, Thiago [3] ; Bott-Neto, Jose L. [2] ; Gomez-Marin, Ana M. [2] ; Tanaka, Auro A. [1] ; Ticianelli, Edson A. [2]
Total Authors: 6
[1] Univ Fed Maranhao, BR-65080040 Sao Luis, MA - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560960 Sao Paulo, SP - Brazil
[3] CNEN SP, IPEN, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ELECTROCATALYSIS; v. 10, n. 2, p. 134-148, MAR 2019.
Web of Science Citations: 0

This work investigates the influence of different nitration protocols of a carbon black, the addition of tungsten carbide (WC), and the presence of iron, in terms of the catalytic activity of electrocatalysts containing Fe-N-x moieties towards the oxygen reduction reaction (ORR) in acidic and alkaline media. The synthesized materials were characterized using X-ray diffraction (XRD), Raman spectroscopy (Raman), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) with a rotating ring-disk electrode (RRDE), in addition to durability tests. In acidic media, the performance of the catalysts varied according to the type of nitration protocol, the presence of iron, and the heat treatment temperature, which is accompanied by variations in the ORR mechanism. In alkaline electrolyte, the electrocatalysts presented higher performances, with only an similar to 0.04-V difference relative to that of a standard platinum on carbon catalyst. The number of electrons transferred per oxygen molecule, the amounts of hydrogen peroxide generated in the ORR, the effect of catalyst loading, and the presence of iron in the catalysts were investigated with the aim of understanding the ORR mechanism and assisting in the production of high-performance and durable materials. Finally, the two best electrocatalysts were submitted to a standard durability test, which evidenced promising high stability at both pHs. (AU)

FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 14/22130-6 - Electrocatalysis beyond platinum: development of sustainable electrocatalysts
Grantee:Thiago Lopes
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 17/15304-6 - Electrocatalysis beyond platinum: development of sustainable electrocatalysts
Grantee:Thiago Lopes
Support type: Scholarships in Brazil - Young Researchers
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells
Grantee:Marcelo Linardi
Support type: Research Projects - Thematic Grants