Cargando…
Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies
In situ hard x-ray photoemission spectroscopy (HX-PES) and soft x-ray absorption spectroscopy (SX-XAS) have been employed to investigate a local redox reaction at the carbon/Gd-doped CeO(2) (GDC) thin film heterointerface under applied dc bias. In HX-PES, Ce3d and O1s core levels show a parallel che...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Taylor & Francis
2013
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5090320/ https://www.ncbi.nlm.nih.gov/pubmed/27877594 http://dx.doi.org/10.1088/1468-6996/14/4/045001 |
_version_ | 1782464386010447872 |
---|---|
author | Tsuchiya, Takashi Miyoshi, Shogo Yamashita, Yoshiyuki Yoshikawa, Hideki Terabe, Kazuya Kobayashi, Keisuke Yamaguchi, Shu |
author_facet | Tsuchiya, Takashi Miyoshi, Shogo Yamashita, Yoshiyuki Yoshikawa, Hideki Terabe, Kazuya Kobayashi, Keisuke Yamaguchi, Shu |
author_sort | Tsuchiya, Takashi |
collection | PubMed |
description | In situ hard x-ray photoemission spectroscopy (HX-PES) and soft x-ray absorption spectroscopy (SX-XAS) have been employed to investigate a local redox reaction at the carbon/Gd-doped CeO(2) (GDC) thin film heterointerface under applied dc bias. In HX-PES, Ce3d and O1s core levels show a parallel chemical shift as large as 3.2 eV, corresponding to the redox window where ionic conductivity is predominant. The window width is equal to the energy gap between donor and acceptor levels of the GDC electrolyte. The Ce M-edge SX-XAS spectra also show a considerable increase of Ce(3+) satellite peak intensity, corresponding to electrochemical reduction by oxide ion migration. In addition to the reversible redox reaction, two distinct phenomena by the electrochemical transport of oxide ions are observed as an irreversible reduction of the entire oxide film by O(2) evolution from the GDC film to the gas phase, as well as a vigorous precipitation of oxygen gas at the bottom electrode to lift off the GDC film. These in situ spectroscopic observations describe well the electrochemical polarization behavior of a metal/GDC/metal capacitor-like two-electrode cell at room temperature. |
format | Online Article Text |
id | pubmed-5090320 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Taylor & Francis |
record_format | MEDLINE/PubMed |
spelling | pubmed-50903202016-11-22 Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies Tsuchiya, Takashi Miyoshi, Shogo Yamashita, Yoshiyuki Yoshikawa, Hideki Terabe, Kazuya Kobayashi, Keisuke Yamaguchi, Shu Sci Technol Adv Mater Papers In situ hard x-ray photoemission spectroscopy (HX-PES) and soft x-ray absorption spectroscopy (SX-XAS) have been employed to investigate a local redox reaction at the carbon/Gd-doped CeO(2) (GDC) thin film heterointerface under applied dc bias. In HX-PES, Ce3d and O1s core levels show a parallel chemical shift as large as 3.2 eV, corresponding to the redox window where ionic conductivity is predominant. The window width is equal to the energy gap between donor and acceptor levels of the GDC electrolyte. The Ce M-edge SX-XAS spectra also show a considerable increase of Ce(3+) satellite peak intensity, corresponding to electrochemical reduction by oxide ion migration. In addition to the reversible redox reaction, two distinct phenomena by the electrochemical transport of oxide ions are observed as an irreversible reduction of the entire oxide film by O(2) evolution from the GDC film to the gas phase, as well as a vigorous precipitation of oxygen gas at the bottom electrode to lift off the GDC film. These in situ spectroscopic observations describe well the electrochemical polarization behavior of a metal/GDC/metal capacitor-like two-electrode cell at room temperature. Taylor & Francis 2013-07-08 /pmc/articles/PMC5090320/ /pubmed/27877594 http://dx.doi.org/10.1088/1468-6996/14/4/045001 Text en © 2013 National Institute for Materials Science http://creativecommons.org/licenses/by-nc-sa/3.0/ Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 licence (http://creativecommons.org/licenses/by-nc-sa/3.0) . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
spellingShingle | Papers Tsuchiya, Takashi Miyoshi, Shogo Yamashita, Yoshiyuki Yoshikawa, Hideki Terabe, Kazuya Kobayashi, Keisuke Yamaguchi, Shu Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title | Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title_full | Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title_fullStr | Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title_full_unstemmed | Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title_short | Room temperature redox reaction by oxide ion migration at carbon/Gd-doped CeO(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
title_sort | room temperature redox reaction by oxide ion migration at carbon/gd-doped ceo(2) heterointerface probed by an in situ hard x-ray photoemission and soft x-ray absorption spectroscopies |
topic | Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5090320/ https://www.ncbi.nlm.nih.gov/pubmed/27877594 http://dx.doi.org/10.1088/1468-6996/14/4/045001 |
work_keys_str_mv | AT tsuchiyatakashi roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT miyoshishogo roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT yamashitayoshiyuki roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT yoshikawahideki roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT terabekazuya roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT kobayashikeisuke roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies AT yamaguchishu roomtemperatureredoxreactionbyoxideionmigrationatcarbongddopedceo2heterointerfaceprobedbyaninsituhardxrayphotoemissionandsoftxrayabsorptionspectroscopies |