Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems
Current interrupt and galvanostatic EIS techniques were utilized in a complementary fashion to characterize the different sources of overpotential during anodic gas evolution. Room temperature anodic evolution of oxygen at a nickel working electrode in aqueous potassium hydroxide and the high temper...
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| Format: | Article |
| Language: | English |
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The Electrochemical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/131147 |
| _version_ | 1826214286374993920 |
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| author | Chmielowiec, Brian John Fujimura, Tatsuki Otani, Tomohiro Aoyama, Kiego Nohira, Toshiyuki Homma, Takayuki Fukunaka, Yasuhiro Allanore, Antoine |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Chmielowiec, Brian John Fujimura, Tatsuki Otani, Tomohiro Aoyama, Kiego Nohira, Toshiyuki Homma, Takayuki Fukunaka, Yasuhiro Allanore, Antoine |
| author_sort | Chmielowiec, Brian John |
| collection | MIT |
| description | Current interrupt and galvanostatic EIS techniques were utilized in a complementary fashion to characterize the different sources of overpotential during anodic gas evolution. Room temperature anodic evolution of oxygen at a nickel working electrode in aqueous potassium hydroxide and the high temperature (348°C) anodic evolution of chlorine at a glassy carbon working electrode in molten (LiCl)[subscript 57.5-](KCl)[subscript 13.3-](CsCl)[subscript 29.2 ] where investigatd. Combining of the two techniques enables to separate the total measured overpotential into its ohmic, charge transfer, and mass transfer components. Potential decay curves indicated that natural convection (due to both bubble evolution and density driven flow) was a major driving force in reestablishing equilibrium conditions at the working electrode surface. During oxygen evolution, charge transfer resistance dominated the total overpotential at low current densities, but as the current density approached ~100mA/cm[superscript 2], mass transfer overpotentials and ohmic overpotential became non-negligible. The mass transfer overpotential during chlorine evolution was found to be half that found during oxygen evolution. |
| first_indexed | 2024-09-23T16:03:12Z |
| format | Article |
| id | mit-1721.1/131147 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:03:12Z |
| publishDate | 2021 |
| publisher | The Electrochemical Society |
| record_format | dspace |
| spelling | mit-1721.1/1311472022-10-02T06:00:49Z Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems Chmielowiec, Brian John Fujimura, Tatsuki Otani, Tomohiro Aoyama, Kiego Nohira, Toshiyuki Homma, Takayuki Fukunaka, Yasuhiro Allanore, Antoine Massachusetts Institute of Technology. Department of Materials Science and Engineering MIT Materials Research Laboratory Current interrupt and galvanostatic EIS techniques were utilized in a complementary fashion to characterize the different sources of overpotential during anodic gas evolution. Room temperature anodic evolution of oxygen at a nickel working electrode in aqueous potassium hydroxide and the high temperature (348°C) anodic evolution of chlorine at a glassy carbon working electrode in molten (LiCl)[subscript 57.5-](KCl)[subscript 13.3-](CsCl)[subscript 29.2 ] where investigatd. Combining of the two techniques enables to separate the total measured overpotential into its ohmic, charge transfer, and mass transfer components. Potential decay curves indicated that natural convection (due to both bubble evolution and density driven flow) was a major driving force in reestablishing equilibrium conditions at the working electrode surface. During oxygen evolution, charge transfer resistance dominated the total overpotential at low current densities, but as the current density approached ~100mA/cm[superscript 2], mass transfer overpotentials and ohmic overpotential became non-negligible. The mass transfer overpotential during chlorine evolution was found to be half that found during oxygen evolution. Naval Research (Contract N00014-12-1-0521) 2021-08-09T17:30:07Z 2021-08-09T17:30:07Z 2019-06 2019-04 2019-09-05T13:04:31Z Article http://purl.org/eprint/type/JournalArticle 0013-4651 1945-7111 https://hdl.handle.net/1721.1/131147 Chmielowiec, Brian John et al. "Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems." Journal of The Electrochemical Society 166, 10 (June 2019): E323. © 2019 The Author(s) en http://dx.doi.org/10.1149/2.1001910jes Journal of The Electrochemical Society Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf application/pdf The Electrochemical Society Prof. Allanore |
| spellingShingle | Chmielowiec, Brian John Fujimura, Tatsuki Otani, Tomohiro Aoyama, Kiego Nohira, Toshiyuki Homma, Takayuki Fukunaka, Yasuhiro Allanore, Antoine Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title | Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title_full | Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title_fullStr | Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title_full_unstemmed | Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title_short | Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems |
| title_sort | experimental measurement of overpotential sources during anodic gas evolution in aqueous and molten salt systems |
| url | https://hdl.handle.net/1721.1/131147 |
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