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Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting
The development of reliable production routes for sustainable hydrogen (H(2)), which is an essential feedstock for industrial processes and energy carrier for fuel cells, is needed. It appears to be an unavoidable alternative to significantly reduce the dependence on conventional energy sources base...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7251167/ https://www.ncbi.nlm.nih.gov/pubmed/32509726 http://dx.doi.org/10.3389/fchem.2020.00385 |
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author | Djara, Razik Holade, Yaovi Merzouki, Abdelhafid Lacour, Marie-Agnès Masquelez, Nathalie Flaud, Valerie Cot, Didier Rebiere, Bertrand van der Lee, Arie Cambedouzou, Julien Huguet, Patrice Tingry, Sophie Cornu, David |
author_facet | Djara, Razik Holade, Yaovi Merzouki, Abdelhafid Lacour, Marie-Agnès Masquelez, Nathalie Flaud, Valerie Cot, Didier Rebiere, Bertrand van der Lee, Arie Cambedouzou, Julien Huguet, Patrice Tingry, Sophie Cornu, David |
author_sort | Djara, Razik |
collection | PubMed |
description | The development of reliable production routes for sustainable hydrogen (H(2)), which is an essential feedstock for industrial processes and energy carrier for fuel cells, is needed. It appears to be an unavoidable alternative to significantly reduce the dependence on conventional energy sources based on fossil fuels without increasing the atmospheric CO(2) levels. Among the different power-to-X scenarios to access high purity H(2), the electrochemical approach based on electrolysis looks to be a promising sustainable solution at both the small and large industrial scales. However, the practical realization of this important opportunity faces several challenges, including the efficient design of cost-effective catalytic materials to be used as a cathode with improved intrinsic and durable activity. In this contribution, we report the design and development of efficient nanostructured catalysts for the electrocatalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in aqueous media, whereby noble metal-free elements are embedded in a matrix of a conducting polymer, polyaniline (PANI). To increase the electrical conductivity and further the electrocatalytic ability toward HER of the chemically polymerized PANI in the presence of nickel (II) salt (nitrate), the PANI-based materials have first been stabilized at a mild temperature of 250–350°C in air and then carbonized at 800–1,000°C under nitrogen gas to convert the chemical species into nitrogen, sulfur, nickel, and carbon nanostructured networks (CNNs). Different physicochemical (TGA-DSC, Raman spectroscopy, XRD, SEM, EDX, ICP, CHNS, BET, and XPS) and electrochemical (voltammetry and electrochemical impedance spectrometry) methods have been integrated to characterize the as-synthesized CNNs materials and interrogate the relationship of material-to-performance. It has been found that those synthesis conditions allow for the substantial increase of the electrocatalytic performance toward HER and OER in alkaline media in terms of the onset potential and charge transfer resistance and overpotential at the specific activity of 10 milliamps per square centimeter, thus ranking the present materials among the most efficient noble metal-free catalysts and making them possible candidates for integration in practical low-energy consumption alkaline electrolyzers. |
format | Online Article Text |
id | pubmed-7251167 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-72511672020-06-05 Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting Djara, Razik Holade, Yaovi Merzouki, Abdelhafid Lacour, Marie-Agnès Masquelez, Nathalie Flaud, Valerie Cot, Didier Rebiere, Bertrand van der Lee, Arie Cambedouzou, Julien Huguet, Patrice Tingry, Sophie Cornu, David Front Chem Chemistry The development of reliable production routes for sustainable hydrogen (H(2)), which is an essential feedstock for industrial processes and energy carrier for fuel cells, is needed. It appears to be an unavoidable alternative to significantly reduce the dependence on conventional energy sources based on fossil fuels without increasing the atmospheric CO(2) levels. Among the different power-to-X scenarios to access high purity H(2), the electrochemical approach based on electrolysis looks to be a promising sustainable solution at both the small and large industrial scales. However, the practical realization of this important opportunity faces several challenges, including the efficient design of cost-effective catalytic materials to be used as a cathode with improved intrinsic and durable activity. In this contribution, we report the design and development of efficient nanostructured catalysts for the electrocatalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in aqueous media, whereby noble metal-free elements are embedded in a matrix of a conducting polymer, polyaniline (PANI). To increase the electrical conductivity and further the electrocatalytic ability toward HER of the chemically polymerized PANI in the presence of nickel (II) salt (nitrate), the PANI-based materials have first been stabilized at a mild temperature of 250–350°C in air and then carbonized at 800–1,000°C under nitrogen gas to convert the chemical species into nitrogen, sulfur, nickel, and carbon nanostructured networks (CNNs). Different physicochemical (TGA-DSC, Raman spectroscopy, XRD, SEM, EDX, ICP, CHNS, BET, and XPS) and electrochemical (voltammetry and electrochemical impedance spectrometry) methods have been integrated to characterize the as-synthesized CNNs materials and interrogate the relationship of material-to-performance. It has been found that those synthesis conditions allow for the substantial increase of the electrocatalytic performance toward HER and OER in alkaline media in terms of the onset potential and charge transfer resistance and overpotential at the specific activity of 10 milliamps per square centimeter, thus ranking the present materials among the most efficient noble metal-free catalysts and making them possible candidates for integration in practical low-energy consumption alkaline electrolyzers. Frontiers Media S.A. 2020-05-20 /pmc/articles/PMC7251167/ /pubmed/32509726 http://dx.doi.org/10.3389/fchem.2020.00385 Text en Copyright © 2020 Djara, Holade, Merzouki, Lacour, Masquelez, Flaud, Cot, Rebiere, van der Lee, Cambedouzou, Huguet, Tingry and Cornu. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Chemistry Djara, Razik Holade, Yaovi Merzouki, Abdelhafid Lacour, Marie-Agnès Masquelez, Nathalie Flaud, Valerie Cot, Didier Rebiere, Bertrand van der Lee, Arie Cambedouzou, Julien Huguet, Patrice Tingry, Sophie Cornu, David Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title | Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title_full | Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title_fullStr | Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title_full_unstemmed | Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title_short | Nanostructured Carbon-Nitrogen-Sulfur-Nickel Networks Derived From Polyaniline as Bifunctional Catalysts for Water Splitting |
title_sort | nanostructured carbon-nitrogen-sulfur-nickel networks derived from polyaniline as bifunctional catalysts for water splitting |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7251167/ https://www.ncbi.nlm.nih.gov/pubmed/32509726 http://dx.doi.org/10.3389/fchem.2020.00385 |
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