Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction
This work shows the preparation of carbon nanospheres with a high superficial nitrogen content (7 wt.%), obtained by a simple hydrothermal method, from pyrocatechol and formaldehyde, around which tungsten nanophases have been formed. One of these nanophases is tungsten carbide, whose electro-catalyt...
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2021-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/24/7716 |
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| author | Teresa Briz-Amate Jesica Castelo-Quibén Esther Bailón-García Abdalla Abdelwahab Francisco Carrasco-Marín Agustín F. Pérez-Cadenas |
| author_facet | Teresa Briz-Amate Jesica Castelo-Quibén Esther Bailón-García Abdalla Abdelwahab Francisco Carrasco-Marín Agustín F. Pérez-Cadenas |
| author_sort | Teresa Briz-Amate |
| collection | DOAJ |
| description | This work shows the preparation of carbon nanospheres with a high superficial nitrogen content (7 wt.%), obtained by a simple hydrothermal method, from pyrocatechol and formaldehyde, around which tungsten nanophases have been formed. One of these nanophases is tungsten carbide, whose electro-catalytic behavior in the ORR has been evaluated together with the presence of nitrogen surface groups. Both current and potential kinetic density values improve considerably with the presence of tungsten, despite the significant nitrogen loss detected during the carbonization treatment. However, the synergetic effect that the WC has with other electro-catalytic metals in this reaction cannot be easily evaluated with the nitrogen in these materials, since both contents vary in opposite ways. Nevertheless, all the prepared materials carried out oxygen electro-reduction by a mixed pathway of two and four electrons, showing remarkable electro-catalytic behavior. |
| first_indexed | 2024-03-10T03:40:11Z |
| format | Article |
| id | doaj.art-859d412a2028460999f36245bdce5213 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:40:11Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-859d412a2028460999f36245bdce52132023-11-23T09:21:59ZengMDPI AGMaterials1996-19442021-12-011424771610.3390/ma14247716Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction ReactionTeresa Briz-Amate0Jesica Castelo-Quibén1Esther Bailón-García2Abdalla Abdelwahab3Francisco Carrasco-Marín4Agustín F. Pérez-Cadenas5Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avenida de Fuente Nueva s/n, 18071 Granada, SpainCarbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avenida de Fuente Nueva s/n, 18071 Granada, SpainCarbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avenida de Fuente Nueva s/n, 18071 Granada, SpainMaterials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef 62511, EgyptCarbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avenida de Fuente Nueva s/n, 18071 Granada, SpainCarbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avenida de Fuente Nueva s/n, 18071 Granada, SpainThis work shows the preparation of carbon nanospheres with a high superficial nitrogen content (7 wt.%), obtained by a simple hydrothermal method, from pyrocatechol and formaldehyde, around which tungsten nanophases have been formed. One of these nanophases is tungsten carbide, whose electro-catalytic behavior in the ORR has been evaluated together with the presence of nitrogen surface groups. Both current and potential kinetic density values improve considerably with the presence of tungsten, despite the significant nitrogen loss detected during the carbonization treatment. However, the synergetic effect that the WC has with other electro-catalytic metals in this reaction cannot be easily evaluated with the nitrogen in these materials, since both contents vary in opposite ways. Nevertheless, all the prepared materials carried out oxygen electro-reduction by a mixed pathway of two and four electrons, showing remarkable electro-catalytic behavior.https://www.mdpi.com/1996-1944/14/24/7716carbon nanospherestungsten carbidecarbon–tungsten compositesnitrogen-doped electro-catalystsoxygen reduction reaction |
| spellingShingle | Teresa Briz-Amate Jesica Castelo-Quibén Esther Bailón-García Abdalla Abdelwahab Francisco Carrasco-Marín Agustín F. Pérez-Cadenas Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction Materials carbon nanospheres tungsten carbide carbon–tungsten composites nitrogen-doped electro-catalysts oxygen reduction reaction |
| title | Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction |
| title_full | Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction |
| title_fullStr | Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction |
| title_full_unstemmed | Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction |
| title_short | Growing Tungsten Nanophases on Carbon Spheres Doped with Nitrogen. Behaviour as Electro-Catalysts for Oxygen Reduction Reaction |
| title_sort | growing tungsten nanophases on carbon spheres doped with nitrogen behaviour as electro catalysts for oxygen reduction reaction |
| topic | carbon nanospheres tungsten carbide carbon–tungsten composites nitrogen-doped electro-catalysts oxygen reduction reaction |
| url | https://www.mdpi.com/1996-1944/14/24/7716 |
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