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Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer
Carbon-based cathode catalysts derived from a hyperbranched iron phthalocyanine polymer (HB-FePc) were characterized, and their active-site formation mechanism was studied by synchrotron-based spectroscopy. The properties of the HB-FePc catalyst are compared with those of a catalyst with high oxygen...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer US
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4401482/ https://www.ncbi.nlm.nih.gov/pubmed/25918496 http://dx.doi.org/10.1186/s11671-015-0881-8 |
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author | Hiraike, Yusuke Saito, Makoto Niwa, Hideharu Kobayashi, Masaki Harada, Yoshihisa Oshima, Masaharu Kim, Jaehong Nabae, Yuta Kakimoto, Masa-aki |
author_facet | Hiraike, Yusuke Saito, Makoto Niwa, Hideharu Kobayashi, Masaki Harada, Yoshihisa Oshima, Masaharu Kim, Jaehong Nabae, Yuta Kakimoto, Masa-aki |
author_sort | Hiraike, Yusuke |
collection | PubMed |
description | Carbon-based cathode catalysts derived from a hyperbranched iron phthalocyanine polymer (HB-FePc) were characterized, and their active-site formation mechanism was studied by synchrotron-based spectroscopy. The properties of the HB-FePc catalyst are compared with those of a catalyst with high oxygen reduction reaction (ORR) activity synthesized from a mixture of iron phthalocyanine and phenolic resin (FePc/PhRs). Electrochemical measurements demonstrate that the HB-FePc catalyst does not lose its ORR activity up to 900°C, whereas that of the FePc/PhRs catalyst decreases above 700°C. Hard X-ray photoemission spectra reveal that the HB-FePc catalysts retain more nitrogen components than the FePc/PhRs catalysts between pyrolysis temperatures of 600°C and 800°C. This is because the linked structure of the HB-FePc precursor has high thermostability against nitrogen desorption. Consequently, effective doping of active nitrogen species into the sp(2) carbon network of the HB-FePc catalysts may occur up to 900°C. |
format | Online Article Text |
id | pubmed-4401482 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Springer US |
record_format | MEDLINE/PubMed |
spelling | pubmed-44014822015-04-27 Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer Hiraike, Yusuke Saito, Makoto Niwa, Hideharu Kobayashi, Masaki Harada, Yoshihisa Oshima, Masaharu Kim, Jaehong Nabae, Yuta Kakimoto, Masa-aki Nanoscale Res Lett Nano Express Carbon-based cathode catalysts derived from a hyperbranched iron phthalocyanine polymer (HB-FePc) were characterized, and their active-site formation mechanism was studied by synchrotron-based spectroscopy. The properties of the HB-FePc catalyst are compared with those of a catalyst with high oxygen reduction reaction (ORR) activity synthesized from a mixture of iron phthalocyanine and phenolic resin (FePc/PhRs). Electrochemical measurements demonstrate that the HB-FePc catalyst does not lose its ORR activity up to 900°C, whereas that of the FePc/PhRs catalyst decreases above 700°C. Hard X-ray photoemission spectra reveal that the HB-FePc catalysts retain more nitrogen components than the FePc/PhRs catalysts between pyrolysis temperatures of 600°C and 800°C. This is because the linked structure of the HB-FePc precursor has high thermostability against nitrogen desorption. Consequently, effective doping of active nitrogen species into the sp(2) carbon network of the HB-FePc catalysts may occur up to 900°C. Springer US 2015-04-14 /pmc/articles/PMC4401482/ /pubmed/25918496 http://dx.doi.org/10.1186/s11671-015-0881-8 Text en © Hiraike et al.; licensee Springer. 2015 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. |
spellingShingle | Nano Express Hiraike, Yusuke Saito, Makoto Niwa, Hideharu Kobayashi, Masaki Harada, Yoshihisa Oshima, Masaharu Kim, Jaehong Nabae, Yuta Kakimoto, Masa-aki Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title | Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title_full | Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title_fullStr | Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title_full_unstemmed | Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title_short | Active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
title_sort | active site formation mechanism of carbon-based oxygen reduction catalysts derived from a hyperbranched iron phthalocyanine polymer |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4401482/ https://www.ncbi.nlm.nih.gov/pubmed/25918496 http://dx.doi.org/10.1186/s11671-015-0881-8 |
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