Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes
The pseudocapacitive flowable electrodes typically show high energy density because of the contribution of the faradaic charge of redox-active organic materials and the electric double layer charge of carbon materials. However, the redox reaction kinetics of organic molecules are slow due to poor di...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2023-04-01
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| Series: | Electrochemistry |
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| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/91/4/91_23-00024/_html/-char/en |
| _version_ | 1797838008556191744 |
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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 | The pseudocapacitive flowable electrodes typically show high energy density because of the contribution of the faradaic charge of redox-active organic materials and the electric double layer charge of carbon materials. However, the redox reaction kinetics of organic molecules are slow due to poor diffusion kinetics. We recently reported that a pseudocapacitive flowable electrode exhibited bell-shaped cyclic voltammograms (peak separation (ΔEp) = 0 mV); specifically, the molecules were confined within slit-shaped graphitic micropores of activated carbon (AC). Herein, we studied the relationship between charge storage and the reaction mechanism to tailor the electrochemical performance of a pseudocapacitive flowable electrode by half-cell study. The results show that the redox reaction of the confined molecules entailed a charge-transfer-controlled mechanism, while the unconfined molecules exhibited a mass-transfer-controlled system. This difference inhibited the fast charging and discharging of the pseudocapacitive flowable electrode. This study demonstrates that half-cell studies are crucial for clarifying the relationship between the charge storage and rate performances of pseudocapacitive flowable electrodes. |
| first_indexed | 2024-04-09T15:34:58Z |
| format | Article |
| id | doaj.art-e4d28984216c4754afd5c02af52bdf5a |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-04-09T15:34:58Z |
| publishDate | 2023-04-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-e4d28984216c4754afd5c02af52bdf5a2023-04-28T01:11:57ZengThe Electrochemical Society of JapanElectrochemistry2186-24512023-04-0191404700504700510.5796/electrochemistry.23-00024electrochemistryConfinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable ElectrodesDaisuke 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 UniversityThe pseudocapacitive flowable electrodes typically show high energy density because of the contribution of the faradaic charge of redox-active organic materials and the electric double layer charge of carbon materials. However, the redox reaction kinetics of organic molecules are slow due to poor diffusion kinetics. We recently reported that a pseudocapacitive flowable electrode exhibited bell-shaped cyclic voltammograms (peak separation (ΔEp) = 0 mV); specifically, the molecules were confined within slit-shaped graphitic micropores of activated carbon (AC). Herein, we studied the relationship between charge storage and the reaction mechanism to tailor the electrochemical performance of a pseudocapacitive flowable electrode by half-cell study. The results show that the redox reaction of the confined molecules entailed a charge-transfer-controlled mechanism, while the unconfined molecules exhibited a mass-transfer-controlled system. This difference inhibited the fast charging and discharging of the pseudocapacitive flowable electrode. This study demonstrates that half-cell studies are crucial for clarifying the relationship between the charge storage and rate performances of pseudocapacitive flowable electrodes.https://www.jstage.jst.go.jp/article/electrochemistry/91/4/91_23-00024/_html/-char/enflow capacitorpseudocapacitive flowable electrodequinone-based moleculesconfinement effects |
| spellingShingle | Daisuke TAKIMOTO Keisuke SUZUKI Sho HIDESHIMA Wataru SUGIMOTO Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes Electrochemistry flow capacitor pseudocapacitive flowable electrode quinone-based molecules confinement effects |
| title | Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes |
| title_full | Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes |
| title_fullStr | Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes |
| title_full_unstemmed | Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes |
| title_short | Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes |
| title_sort | confinement effects on the rate performance of redox active molecules for pseudocapacitive flowable electrodes |
| topic | flow capacitor pseudocapacitive flowable electrode quinone-based molecules confinement effects |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/91/4/91_23-00024/_html/-char/en |
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