Key factors improving oxygen reduction reaction activity in cobalt nanoparticles modified carbon nanotubes

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/67479
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Title: Key factors improving oxygen reduction reaction activity in cobalt nanoparticles modified carbon nanotubes
Authors: Gabe, Atsushi | García Aguilar, Jaime | Berenguer-Murcia, Ángel | Morallon, Emilia | Cazorla-Amorós, Diego
Research Group/s: Materiales Carbonosos y Medio Ambiente | Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Oxygen reduction reaction | Electrocatalyst | CoOx nanoparticles | Carbon nanotubes | C-N-Co interaction
Knowledge Area: Química Inorgánica | Química Física
Issue Date: 15-Nov-2017
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2017, 217: 303-312. doi:10.1016/j.apcatb.2017.05.096
Abstract: Multiwall carbon nanotubes (CNTs) decorated with cobalt oxide (CoOx) nanoparticles (NPs) are prepared in various synthesis conditions to investigate their capability as oxygen reduction reaction (ORR) catalysts for fuel cells in alkaline media. The synthesis conditions include the use of protecting, reducing or complexing agents and heat treatment. Higher ORR activity is possible for smaller size of Co NPs catalysts due to the enlarged interfaces between Co species and CNTs. The addition of polyvinylpyrrolidone (PVP) as protecting agent and NaBH4 during the preparation procedure is necessary for obtaining the highest activity since it favors the formation of lower oxidation states for Co species and the incorporation of N groups which improve ORR activity. CNTs loaded with only 1 wt.% of Co NPs prepared by a facile method using PVP, NaBH4 and subsequent heat treatment at 500 °C under N2 atmosphere, demonstrates both similar catalytic activity and stability than Pt/Vulcan (20 wt.% Pt on Vulcan). The synergic chemical coupling effects between CNTs and CoOx NPs and the presence of carbon material with pyridinic N and quaternary N groups formed from the protecting agent decomposition, seem to be the main factors responsible for the remarkable electrocatalytic activity.
Sponsor: The authors would like to thank GV and FEDER (PROMETEOII/2014/010), projects CTQ2015-66080-R (MINECO/FEDER), MAT2016-76595-R (MINECO/FEDER), BES-2013-063678 and HEIWA NAKAJIMA FOUNDATION for the financial support.
URI: http://hdl.handle.net/10045/67479
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2017.05.096
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2017.05.096
Appears in Collections:INV - MCMA - Artículos de Revistas
INV - GEPE - Artículos de Revistas

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