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Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications

Hierarchically structured 3-dimensional electrodes based on branched carbon nanotubes (CNTs) are prepared on a glassy carbon (GC) substrate in a sequence of electrodeposition and chemical vapor deposition (CVD) steps as follows: Primary CNTs are grown over electrodeposited iron by CVD followed by a...

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Autores principales: Wang, Pei, Kulp, Katarzyna, Bron, Michael
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6664386/
https://www.ncbi.nlm.nih.gov/pubmed/31431860
http://dx.doi.org/10.3762/bjnano.10.146
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author Wang, Pei
Kulp, Katarzyna
Bron, Michael
author_facet Wang, Pei
Kulp, Katarzyna
Bron, Michael
author_sort Wang, Pei
collection PubMed
description Hierarchically structured 3-dimensional electrodes based on branched carbon nanotubes (CNTs) are prepared on a glassy carbon (GC) substrate in a sequence of electrodeposition and chemical vapor deposition (CVD) steps as follows: Primary CNTs are grown over electrodeposited iron by CVD followed by a second Fe deposition and finally the CVD growth of secondary CNTs. The prepared 3-dimensional CNT structures (CNT/CNT/GC) exhibit enhanced double-layer capacitance and thus larger surface area compared to CNT/GC. Pt electrodeposition onto both types of electrodes yields a uniform and homogeneous Pt nanoparticle distribution. Each preparation step is followed by scanning electron microscopy, while the CNTs were additionally characterized by Raman spectroscopy. In this way it is demonstrated that by varying the parameters during the electrodeposition and CVD steps, a tuning of the structural parameters of the hierarchical electrodes is possible. The suitability of the hierarchical electrodes for electrocatalytic applications is demonstrated using the methanol electro-oxidation as a test reaction. The Pt mass specific activity towards methanol oxidation of Pt-CNT/CNT/GC is approximately 2.5 times higher than that of Pt-CNT/GC, and the hierarchical electrode exhibits a more negative onset potential. Both structures demonstrate an exceptionally high poisoning tolerance.
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spelling pubmed-66643862019-08-20 Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications Wang, Pei Kulp, Katarzyna Bron, Michael Beilstein J Nanotechnol Full Research Paper Hierarchically structured 3-dimensional electrodes based on branched carbon nanotubes (CNTs) are prepared on a glassy carbon (GC) substrate in a sequence of electrodeposition and chemical vapor deposition (CVD) steps as follows: Primary CNTs are grown over electrodeposited iron by CVD followed by a second Fe deposition and finally the CVD growth of secondary CNTs. The prepared 3-dimensional CNT structures (CNT/CNT/GC) exhibit enhanced double-layer capacitance and thus larger surface area compared to CNT/GC. Pt electrodeposition onto both types of electrodes yields a uniform and homogeneous Pt nanoparticle distribution. Each preparation step is followed by scanning electron microscopy, while the CNTs were additionally characterized by Raman spectroscopy. In this way it is demonstrated that by varying the parameters during the electrodeposition and CVD steps, a tuning of the structural parameters of the hierarchical electrodes is possible. The suitability of the hierarchical electrodes for electrocatalytic applications is demonstrated using the methanol electro-oxidation as a test reaction. The Pt mass specific activity towards methanol oxidation of Pt-CNT/CNT/GC is approximately 2.5 times higher than that of Pt-CNT/GC, and the hierarchical electrode exhibits a more negative onset potential. Both structures demonstrate an exceptionally high poisoning tolerance. Beilstein-Institut 2019-07-24 /pmc/articles/PMC6664386/ /pubmed/31431860 http://dx.doi.org/10.3762/bjnano.10.146 Text en Copyright © 2019, Wang et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Wang, Pei
Kulp, Katarzyna
Bron, Michael
Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title_full Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title_fullStr Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title_full_unstemmed Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title_short Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications
title_sort hierarchically structured 3d carbon nanotube electrodes for electrocatalytic applications
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6664386/
https://www.ncbi.nlm.nih.gov/pubmed/31431860
http://dx.doi.org/10.3762/bjnano.10.146
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