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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.)

NiOX-Pt/C nanocomposites: Highly active electrocatalysts for the electrochemical oxidation of hydrazine

Full text
Author(s):
de Oliveira, Drielly C. ; Silva, Wanderson O. ; Chatenet, Marian ; Lima, Fabio H. B.
Total Authors: 4
Document type: Journal article
Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 201, p. 22-28, FEB 2017.
Web of Science Citations: 15
Abstract

NiOx-modified Pt/C nanocomposites are synthesized and investigated for hydrazine electrooxidation in an alkaline electrolyte. The reaction onset potential is significantly reduced in comparison to that of pure Pt/C, owing to the occurrence of a bifunctional mechanism, in which OH species on Ni sites facilitate the oxidation of adsorbed H atoms on the Pt surface. On-line Differential Electrochemical Mass Spectrometry (DEMS) shows that NiOx-Pt/C catalyzes the heterogeneous chemical hydrolysis at open circuit potential, producing H-2 and N-2.Just above the OCP, the H-2 signal in DEMS decreases concomitantly with the increase in faradaic current, due to quantitative H-2 (and Had) electrooxidation on Pt, or due to the deceleration of the overall reaction of hydrolysis. At slightly higher potentials, the N-2 signal further rises, which indicates the onset of complete electrooxidation of hydrazine. In the platinum-oxide region, the H-2 signal increases again and this process is also accompanied by a small ionic signal of NH3, evidencing the occurrence of an incomplete hydrazine electrooxidation route, at least in a minor extent. (C) 2016 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/50727-9 - Development of systems for hydrogen production and for the generation and utilization of electrochemical energy
Grantee:Ernesto Rafael Gonzalez
Support type: Research Projects - Thematic Grants
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: 13/00197-9 - Study of the hydrazine and borohidride ions electro-oxidation reaction on non-noble metal electrocatalysts for alkaline fuel cells
Grantee:Drielly Cristina de Oliveira
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/12232-3 - Study of the hydrazine and borohydride ions electro-oxidation reaction on non-noble metal electrocatalysts for alkaline fuel cells
Grantee:Drielly Cristina de Oliveira
Support type: Scholarships abroad - Research Internship - Doctorate