Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 201, Issue -, Pages 22-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.08.007
Keywords
Hydrazine electrooxidation; Nickel-platinum electrocatalyst; On-line DEMS; Alkaline fuel cells
Funding
- FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) - Sao Paulo Research Foundation [2011/50727-9, 2013/16930-7, 2013/12232-3, 2013/00197-9]
- CAPES-COFECUB [Ph598/08]
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [306213/2013-3, 477153/2013-5]
- Fundacao de Amparo a Pesquisa do Estado do Maranhao - Maranhao Research Foundation [BD-01638/13]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/50727-9] Funding Source: FAPESP
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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.
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