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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.)

MWCNT-COOH supported PtSnNi electrocatalysts for direct ethanol fuel cells: Low Pt content, selectivity and chemical stability

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Parreira, Luanna S. [1] ; Antoniassi, Rodolfo M. [1, 2] ; Freitas, Isabel C. [3, 4] ; de Oliveira, Daniela C. [5] ; Spinace, Estevam V. [2] ; Camargo, Pedro H. C. [3, 6] ; dos Santos, Mauro C. [1]
Total Authors: 7
[1] Univ Fed ABC UFABC, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] CNEN SP, IPEN, Av Prof Lines Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Av Prof Lineu Prestes 748, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[4] Max Planck Inst Kohlenforsch, Dept Heterogeneous Catalysis, Kaiser Wilhelm Pl 1, D-D45470 Mulheim - Germany
[5] LNLS, R Giuseppe Maximo Scolfaro 10-000, BR-13083100 Campinas, SP - Brazil
[6] Univ Helsinki, Dept Chem, AI Virtasen Aukio 1, Helsinki - Finland
Total Affiliations: 6
Document type: Journal article
Source: RENEWABLE ENERGY; v. 143, p. 1397-1405, DEC 2019.
Web of Science Citations: 1

PtSnNi electrocatalysts (60: 40: 40 mass ratio) supported on Vulcan (R) XC-72 (Cabot) carbon and COOH-functionalized multiwalled carbon nanotubes (Cheaptubes (R)) with 15% of metal loading were prepared. The nanoparticles size of 2-3 nm for both supports was estimated by HRTEM. In the direct ethanol fuel cell experiments, PtSnNi/C presents 50 mA cm(-2) reaching the maximum power density (MPD) of 12 mW cm(-2) and decreasing at higher currents, while PtSnNi/MWCNT-COOH obtains similar values of MPD (60 mA cm(-2)), but keeping the best performance. By GC (gas chromatography) technique, it was possible to observe that the electrocatalyst supported on MWCNT-COOH favored the ethanol oxidation to acetaldehyde and acetic acid, although the material supported on Vulcan (R) XC-72 carbon presented almost 100% of selectivity for acetaldehyde. This behavior was maintained also when the current of 0.1 A was applied for 80 min. For the PtSnNi/C electrocatalyst, the selectivity to only acetaldehyde can be related to Sn and Ni dissolution process that can become the electrocatalytic activity similar to Pt/C, decreasing the power density as observed in our experiments. Established by EDS analysis, after 80 min of polarization, the Ni and Sn relative atomic ratio was lower on the catalytic anodic layer of PtSnNi/C than on PtSnNi/MWCNT-COOH. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 16/00819-8 - Controlled synthesis of nanomaterials based on Pd and Pt: electrocatalytic activity and stability
Grantee:Luanna Silveira Parreira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/21366-9 - Hybrid materials containing metal nanoparticles for catalytic applications
Grantee:Pedro Henrique Cury Camargo
Support type: Regular Research Grants
FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
Grantee:Roberto Manuel Torresi
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
Grantee:Mauro Coelho dos Santos
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants