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N-doped Carbon Nanotubes enriched with graphitic Nitrogen in a Buckypaper configuration as efficient 3D electrodes for Oxygen Reduction to H2O2

Abstract

A set of N-doped Carbon Nanotubes (CNx) samples were obtained by modifying the synthesis temperature. Consequently, the proportion of graphitic Nitrogen (Ngraph) was systematically increased as a function of temperature. This allowed evaluating the role of CNx graphitic Nitrogen in the Oxygen Reduction Reaction (ORR). A correlation between the Ngraph content and the ORR onset potential shifted to more positive potentials together with a kinetic current density (jk) increment was obtained; showing that Ngraph plays a significant catalytic role in the ORR. The samples with high Ngraph content favor the two-electron pathway of the ORR not only in basic media (pH=13) but in the actual neutral media (pH=7); representing an attractive alternative for wastewater remediation through the on-site generation of H2O2. Energetic calculations show that the H2O2 formation must be favorable with the presence of graphitic nitrogen sites. Finally, the buckypaper arrangement performance was evaluated showing a higher cathodic current peak when compared to CNx traditional ink dispersions. All this together, not only sheds light on the Ngraph role in the ORR, but it evidences the CNx buckypapers as an efficient 3D electrode for electrocatalytic applications.

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Supplementary files

Publication details

The article was received on 17 Oct 2018, accepted on 07 Jan 2019 and first published on 09 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR08384C
Citation: Nanoscale, 2019, Accepted Manuscript
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    N-doped Carbon Nanotubes enriched with graphitic Nitrogen in a Buckypaper configuration as efficient 3D electrodes for Oxygen Reduction to H2O2

    E. Contreras, D. Domínguez, H. Tiznado, J. Guerrero-Sanchez, N. Takeuchi, G. Alonso-Núñez, O. E. Contreras, M. T. Oropeza-Guzman and J. M. Romo-Herrera, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR08384C

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