Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width
Redox-active organic materials have emerged as promising alternatives to inorganic electrode materials in electrochemical devices owing to advantages such as low cost and flexible design. However, the kinetics of their electrochemical reactions are typically slow due to the slow diffusion of organic...
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2023-07-01
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| Series: | Electrochemistry |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/91/7/91_23-00052/_html/-char/en |
| _version_ | 1797769000004878336 |
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| author | Daisuke TAKIMOTO Keisuke SUZUKI Sho HIDESHIMA Wataru SUGIMOTO |
| author_facet | Daisuke TAKIMOTO Keisuke SUZUKI Sho HIDESHIMA Wataru SUGIMOTO |
| author_sort | Daisuke TAKIMOTO |
| collection | DOAJ |
| description | Redox-active organic materials have emerged as promising alternatives to inorganic electrode materials in electrochemical devices owing to advantages such as low cost and flexible design. However, the kinetics of their electrochemical reactions are typically slow due to the slow diffusion of organic materials dissolved in the electrolyte. Generally, peak separation of the redox reaction is observed (mass-transfer-controlled system), while no peak separation is obtained when the active molecules, such as high surface carbon material, are adsorbed onto the electrode material (adsorption-controlled system). Aromatic compounds confined in activated carbon (AC) micropores exhibit an adsorption-controlled reaction, improving the reaction kinetics. To elucidate this behavior, a well-defined and accurate understanding of the pore geometry is required. Although various synthetic techniques have been used to tune the micropore size, these afford different surface properties. This study reports an approach to achieve an adsorption-controlled redox reaction of quinone-based molecules and a tool to analyze their reaction environment. AC micropores sized <1 nm were filled with n-nonane without any change occurring in the AC surface properties. It was thus concluded that AC micropores in the sub-nanometer scale are necessary for an adsorption-controlled redox reaction to occur. This study reveals new insights on the micropore confinement effect in electrochemistry. |
| first_indexed | 2024-03-12T21:02:28Z |
| format | Article |
| id | doaj.art-e4e67184b3d740c296d02dcba668610c |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-03-12T21:02:28Z |
| publishDate | 2023-07-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-e4e67184b3d740c296d02dcba668610c2023-07-31T05:40:15ZengThe Electrochemical Society of JapanElectrochemistry2186-24512023-07-0191707700607700610.5796/electrochemistry.23-00052electrochemistryOrigin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore WidthDaisuke TAKIMOTO0https://orcid.org/0000-0002-9697-6272Keisuke SUZUKI1Sho HIDESHIMA2https://orcid.org/0000-0001-7711-3079Wataru SUGIMOTO3https://orcid.org/0000-0003-3868-042XResearch Initiative for Supra-Materials (RISM), Shinshu UniversityDepartment of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu UniversityResearch Initiative for Supra-Materials (RISM), Shinshu UniversityResearch Initiative for Supra-Materials (RISM), Shinshu UniversityRedox-active organic materials have emerged as promising alternatives to inorganic electrode materials in electrochemical devices owing to advantages such as low cost and flexible design. However, the kinetics of their electrochemical reactions are typically slow due to the slow diffusion of organic materials dissolved in the electrolyte. Generally, peak separation of the redox reaction is observed (mass-transfer-controlled system), while no peak separation is obtained when the active molecules, such as high surface carbon material, are adsorbed onto the electrode material (adsorption-controlled system). Aromatic compounds confined in activated carbon (AC) micropores exhibit an adsorption-controlled reaction, improving the reaction kinetics. To elucidate this behavior, a well-defined and accurate understanding of the pore geometry is required. Although various synthetic techniques have been used to tune the micropore size, these afford different surface properties. This study reports an approach to achieve an adsorption-controlled redox reaction of quinone-based molecules and a tool to analyze their reaction environment. AC micropores sized <1 nm were filled with n-nonane without any change occurring in the AC surface properties. It was thus concluded that AC micropores in the sub-nanometer scale are necessary for an adsorption-controlled redox reaction to occur. This study reveals new insights on the micropore confinement effect in electrochemistry.https://www.jstage.jst.go.jp/article/electrochemistry/91/7/91_23-00052/_html/-char/enmicropore-fillingn-nonanereversible redox reactionmicropore-confined electrochemistry |
| spellingShingle | Daisuke TAKIMOTO Keisuke SUZUKI Sho HIDESHIMA Wataru SUGIMOTO Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width Electrochemistry micropore-filling n-nonane reversible redox reaction micropore-confined electrochemistry |
| title | Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width |
| title_full | Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width |
| title_fullStr | Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width |
| title_full_unstemmed | Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width |
| title_short | Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width |
| title_sort | origin of the adsorption controlled redox behavior of quinone based molecules importance of the micropore width |
| topic | micropore-filling n-nonane reversible redox reaction micropore-confined electrochemistry |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/91/7/91_23-00052/_html/-char/en |
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