Functionalization of carbon nanotubes using aminobenzene acids and electrochemical methods. Electroactivity for the oxygen reduction reaction

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Title: Functionalization of carbon nanotubes using aminobenzene acids and electrochemical methods. Electroactivity for the oxygen reduction reaction
Authors: González-Gaitán, Carolina | Ruiz-Rosas, Ramiro | Morallon, Emilia | Cazorla-Amorós, Diego
Research Group/s: Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Carbon nanotube | Electrochemical functionalization | Aminobenzene acids | ORR | PEMFC
Knowledge Area: Química Física | Química Inorgánica
Issue Date: 14-Sep-2015
Publisher: Elsevier
Citation: International Journal of Hydrogen Energy. 2015, 40(34): 11242-11253. doi:10.1016/j.ijhydene.2015.02.070
Abstract: Functionalized carbon nanotubes (CNTs) using three aminobenzene acids with different functional groups (carboxylic, sulphonic, phosphonic) in para position have been synthesized through potentiodynamic treatment in acid media under oxidative conditions. A noticeable increase in the capacitance for the functionalized carbon nanotubes mainly due to redox processes points out the formation of an electroactive polymer thin film on the CNTs surface along with covalently bonded functionalities. The CNTs functionalized using aminobenzoic acid rendered the highest capacitance values and surface nitrogen content, while the presence of sulfur and/or phosphorus groups in the aminobenzene structure yielded a lower functionalization degree. The oxygen reduction reaction (ORR) activity of the functionalized samples was similar to that of the parent CNTs, independently of the functional group present in the aminobenzene acid. Interestingly, a heat treatment in N2 atmosphere with a very low O2 concentration (3125 ppm) at 800 °C of the CNTs functionalized with aminobenzoic acid produced a material with high amounts of surface oxygen and nitrogen groups (12 and 4% at., respectively), that seem to modulate the electron-donor properties of the resulting material. The onset potential and limiting current for ORR was enhanced for this material. These are promising results that validates the use of electrochemistry for the synthesis of novel N-doped electrocatalysts for ORR in combination with adequate heat treatments.
Sponsor: The authors would like to thank MINECO and FEDER (CTQ2012/31762 and MAT2013-42007-P) and Generalitat Valenciana (PROMETEO/2013/038 and PROMETEOII/2014/010) for the financial support. RRR thanks MINECO for a ‘Juan de la Cierva’ contract (JCI-2012-12664). CGG gratefully acknowledges Generalitat Valenciana for the financial support through a Santiago Grisolı´a grant (GRISOLIA/2013/005).
ISSN: 0360-3199 (Print) | 1879-3487 (Online)
DOI: 10.1016/j.ijhydene.2015.02.070
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas
INV - GEPE - Artículos de Revistas

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