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Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts
This work highlights the importance of the hydrophilicity of a catalyst’s active sites on an oxygen reduction reaction (ORR) through an electrochemical and physico-chemical study on catalysts based on nitrogen-modified carbon doped with different metals (Fe, Cu, and a mixture of them). BET, X-ray Po...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163935/ https://www.ncbi.nlm.nih.gov/pubmed/30135359 http://dx.doi.org/10.3390/nano8090643 |
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author | Longhi, Mariangela Cova, Camilla Pargoletti, Eleonora Coduri, Mauro Santangelo, Saveria Patanè, Salvatore Ditaranto, Nicoletta Cioffi, Nicola Facibeni, Anna Scavini, Marco |
author_facet | Longhi, Mariangela Cova, Camilla Pargoletti, Eleonora Coduri, Mauro Santangelo, Saveria Patanè, Salvatore Ditaranto, Nicoletta Cioffi, Nicola Facibeni, Anna Scavini, Marco |
author_sort | Longhi, Mariangela |
collection | PubMed |
description | This work highlights the importance of the hydrophilicity of a catalyst’s active sites on an oxygen reduction reaction (ORR) through an electrochemical and physico-chemical study on catalysts based on nitrogen-modified carbon doped with different metals (Fe, Cu, and a mixture of them). BET, X-ray Powder Diffraction (XRPD), micro-Raman, X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), and hydrophilicity measurements were performed. All synthesized catalysts are characterized not only by a porous structure, with the porosity distribution centered in the mesoporosity range, but also by the presence of carbon nanostructures. In iron-doped materials, these nanostructures are bamboo-like structures typical of nitrogen carbon nanotubes, which are better organized, in a larger amount, and longer than those in the copper-doped material. Electrochemical ORR results highlight that the presence of iron and nitrogen carbon nanotubes is beneficial to the electroactivity of these materials, but also that the hydrophilicity of the active site is an important parameter affecting electrocatalytic properties. The most active material contains a mixture of Fe and Cu. |
format | Online Article Text |
id | pubmed-6163935 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61639352018-10-10 Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts Longhi, Mariangela Cova, Camilla Pargoletti, Eleonora Coduri, Mauro Santangelo, Saveria Patanè, Salvatore Ditaranto, Nicoletta Cioffi, Nicola Facibeni, Anna Scavini, Marco Nanomaterials (Basel) Article This work highlights the importance of the hydrophilicity of a catalyst’s active sites on an oxygen reduction reaction (ORR) through an electrochemical and physico-chemical study on catalysts based on nitrogen-modified carbon doped with different metals (Fe, Cu, and a mixture of them). BET, X-ray Powder Diffraction (XRPD), micro-Raman, X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), and hydrophilicity measurements were performed. All synthesized catalysts are characterized not only by a porous structure, with the porosity distribution centered in the mesoporosity range, but also by the presence of carbon nanostructures. In iron-doped materials, these nanostructures are bamboo-like structures typical of nitrogen carbon nanotubes, which are better organized, in a larger amount, and longer than those in the copper-doped material. Electrochemical ORR results highlight that the presence of iron and nitrogen carbon nanotubes is beneficial to the electroactivity of these materials, but also that the hydrophilicity of the active site is an important parameter affecting electrocatalytic properties. The most active material contains a mixture of Fe and Cu. MDPI 2018-08-22 /pmc/articles/PMC6163935/ /pubmed/30135359 http://dx.doi.org/10.3390/nano8090643 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Longhi, Mariangela Cova, Camilla Pargoletti, Eleonora Coduri, Mauro Santangelo, Saveria Patanè, Salvatore Ditaranto, Nicoletta Cioffi, Nicola Facibeni, Anna Scavini, Marco Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title | Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title_full | Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title_fullStr | Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title_full_unstemmed | Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title_short | Synergistic Effects of Active Sites’ Nature and Hydrophilicity on the Oxygen Reduction Reaction Activity of Pt-Free Catalysts |
title_sort | synergistic effects of active sites’ nature and hydrophilicity on the oxygen reduction reaction activity of pt-free catalysts |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163935/ https://www.ncbi.nlm.nih.gov/pubmed/30135359 http://dx.doi.org/10.3390/nano8090643 |
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