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

dc.creatorREGO, ULISSES A. do
dc.creatorLOPES, THIAGO
dc.creatorBOTT-NETO, JOSE L.
dc.creatorTANAKA, AURO A.
dc.creatorTICIANELLI, EDSON A.
dc.date2018
dc.date2019-12-27T10:53:20Z
dc.date2019-12-27T10:53:20Z
dc.date.accessioned2023-09-28T14:13:06Z
dc.date.available2023-09-28T14:13:06Z
dc.identifier1572-6657
dc.identifierhttp://repositorio.ipen.br/handle/123456789/30522
dc.identifier810
dc.identifier10.1016/j.jelechem.2018.01.013
dc.identifier70.719
dc.identifier76.33
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9000751
dc.descriptionConsidering 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.
dc.descriptionCoordena????o de Aperfei??oamento de Pessoal de N??vel Superior (CAPES)
dc.descriptionFunda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP)
dc.descriptionCAPES: 1423454
dc.descriptionFAPESP: 13/16930-7; 14/22130-6; 17/15304-6; 14/09087-4; 14/50279-4
dc.format222-231
dc.relationJournal of Electroanalytical Chemistry
dc.rightsopenAccess
dc.subjectelectrochemical corrosion
dc.subjectoxygen
dc.subjectreduction
dc.subjectcarbides
dc.subjectcatalysts
dc.subjecttransition elements
dc.subjectelectrochemistry
dc.subjectenergy storage
dc.subjectstorage
dc.subjectelectrolytes
dc.titleOxygen reduction electrocatalysis on transition metal-nitrogen modified tungsten carbide nanomaterials
dc.typeArtigo de peri??dico
dc.coverageI


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