Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study
We compare approaches to measure oxygen surface exchange kinetics, by simultaneous optical transmission relaxation (OTR) and AC-impedance spectroscopy (AC-IS), on the same mixed conducting SrTi[subscript 0.65]Fe[subscript 0.35]O[subscript 3-x] film. Surface exchange coefficients were evaluated as a...
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IOP Publishing
2018
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| Online Access: | http://hdl.handle.net/1721.1/118587 https://orcid.org/0000-0002-9811-0077 https://orcid.org/0000-0001-8339-3222 |
| _version_ | 1826202867666518016 |
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| author | Perry, Nicola Kim, Jae Jin Tuller, Harry L |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Perry, Nicola Kim, Jae Jin Tuller, Harry L |
| author_sort | Perry, Nicola |
| collection | MIT |
| description | We compare approaches to measure oxygen surface exchange kinetics, by simultaneous optical transmission relaxation (OTR) and AC-impedance spectroscopy (AC-IS), on the same mixed conducting SrTi[subscript 0.65]Fe[subscript 0.35]O[subscript 3-x] film. Surface exchange coefficients were evaluated as a function of oxygen activity in the film, controlled by gas partial pressure and/or DC bias applied across the ionically conducting yttria-stabilized zirconia substrate. Changes in measured light transmission through the film over time (relaxations) resulted from optical absorption changes in the film corresponding to changes in its oxygen and oxidized Fe (~Fe[superscript 4+]) concentrations; such relaxation profiles were successfully described by the equation for surface exchange-limited kinetics appropriate for the film geometry. The k[subscript chem] values obtained by OTR were significantly lower than the AC-IS derived k[subscript chem] values and k[subscript q] values multiplied by the thermodynamic factor (bulk or thin film), suggesting a possible enhancement in k by the metal current collectors (Pt, Au). Long-term degradation in kchemand kqvalues obtained by AC-IS was also attributed to deterioration of the porous Pt current collector, while no significant degradation was observed in the optically derived kchemvalues. The results suggest that, while the current collector might influence measurements by AC-IS, the OTR method offers a continuous, in situ, and contact-free method to measure oxygen exchange kinetics at the native surfaces of thin films. Keywords: Thin films; perovskite; mixed ionic and electronic conductor; oxygen surface exchange; optical absorption; impedance spectroscopy |
| first_indexed | 2024-09-23T12:23:07Z |
| format | Article |
| id | mit-1721.1/118587 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:23:07Z |
| publishDate | 2018 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1185872022-09-28T07:54:03Z Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study Perry, Nicola Kim, Jae Jin Tuller, Harry L Massachusetts Institute of Technology. Department of Materials Science and Engineering Perry, Nicola Kim, Jae Jin Tuller, Harry L We compare approaches to measure oxygen surface exchange kinetics, by simultaneous optical transmission relaxation (OTR) and AC-impedance spectroscopy (AC-IS), on the same mixed conducting SrTi[subscript 0.65]Fe[subscript 0.35]O[subscript 3-x] film. Surface exchange coefficients were evaluated as a function of oxygen activity in the film, controlled by gas partial pressure and/or DC bias applied across the ionically conducting yttria-stabilized zirconia substrate. Changes in measured light transmission through the film over time (relaxations) resulted from optical absorption changes in the film corresponding to changes in its oxygen and oxidized Fe (~Fe[superscript 4+]) concentrations; such relaxation profiles were successfully described by the equation for surface exchange-limited kinetics appropriate for the film geometry. The k[subscript chem] values obtained by OTR were significantly lower than the AC-IS derived k[subscript chem] values and k[subscript q] values multiplied by the thermodynamic factor (bulk or thin film), suggesting a possible enhancement in k by the metal current collectors (Pt, Au). Long-term degradation in kchemand kqvalues obtained by AC-IS was also attributed to deterioration of the porous Pt current collector, while no significant degradation was observed in the optically derived kchemvalues. The results suggest that, while the current collector might influence measurements by AC-IS, the OTR method offers a continuous, in situ, and contact-free method to measure oxygen exchange kinetics at the native surfaces of thin films. Keywords: Thin films; perovskite; mixed ionic and electronic conductor; oxygen surface exchange; optical absorption; impedance spectroscopy United States. Department of Energy. Office of Basic Energy Sciences (Grant DE-SC0002633) 2018-10-16T18:09:08Z 2018-10-16T18:09:08Z 2018-02 2017-04 2018-09-28T11:57:16Z Article http://purl.org/eprint/type/JournalArticle 1468-6996 1878-5514 http://hdl.handle.net/1721.1/118587 Perry, Nicola H. et al “Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study.” Science and Technology of Advanced Materials 19, 1 (February 2018): 130–141 © 2018 The Author(s) https://orcid.org/0000-0002-9811-0077 https://orcid.org/0000-0001-8339-3222 http://dx.doi.org/10.1080/14686996.2018.1430448 Science and Technology of Advanced Materials Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf IOP Publishing Taylor & Francis |
| spellingShingle | Perry, Nicola Kim, Jae Jin Tuller, Harry L Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title | Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title_full | Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title_fullStr | Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title_full_unstemmed | Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title_short | Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study |
| title_sort | oxygen surface exchange kinetics measurement by simultaneous optical transmission relaxation and impedance spectroscopy sr ti fe o subscript 3 x thin film case study |
| url | http://hdl.handle.net/1721.1/118587 https://orcid.org/0000-0002-9811-0077 https://orcid.org/0000-0001-8339-3222 |
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