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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.)

Oxygen reduction electrocatalysis on transition metal-nitrogen modified tungsten carbide nanomaterials

Full text
Author(s):
do Rego, Ulisses Alves [1, 2] ; Lopes, Thiago [1] ; Bott-Neto, Jose Luiz [1] ; Tanaka, Auro Atsushi [2] ; Ticianelli, Edson Antonio [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560960 Sao Carlos, SP - Brazil
[2] Univ Fed Maranhao, BR-65080040 Sao Luis, MA - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 810, p. 222-231, FEB 1 2018.
Web of Science Citations: 5
Abstract

Considering the technological importance of the oxygen reduction reaction (ORR) and the cost constraints of highly catalytically active precious metals, recent research efforts have been focused on designing and synthesizing earth abundant non-precious metal catalysts for this reaction. Among recent advances in this area, transition metal-nitrogen modified tungsten carbides can be pointed as prominent candidates as ORR electrocatalysts. Nevertheless, mechanistically understandings of which active sites are responsible for the ORR electrocatalysis on these materials are required for the rational design of suitable materials. In the present work, various tungsten carbides and iron-nitrogen modified tungsten carbides catalysts are synthesized and in-depth characterized through various physical and electrochemical techniques towards gaining insights on the ORR process on these materials in both acidic and alkaline media. High performance materials are developed, with the most active presenting only a ca. 0.060 V increase in the ORR overpotential, compared to a standard platinum catalyst in an alkaline medium. The in-depth analyses allowed for suggestions on reaction pathways for the oxygen reduction on the hybrid Fe/N/WC/C nanomaterials in terms of active sites. These finds might direct further developments in the research on transition metal-nitrogen modified tungsten carbide materials. (AU)

FAPESP's process: 14/22130-6 - Electrocatalysis beyond platinum: development of sustainable electrocatalysts
Grantee:Thiago Lopes
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/15304-6 - Electrocatalysis beyond platinum: development of sustainable electrocatalysts
Grantee:Thiago Lopes
Support Opportunities: Scholarships in Brazil - Young Researchers
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 Opportunities: Research Projects - Thematic Grants