A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate
To effectively improve the energy density and reduce the self-discharging rate of micro-supercapacitors, an advanced strategy is required. In this study, we developed a hydroquinone (HQ)-based polymer-gel electrolyte (HQ-gel) for micro-supercapacitors. The introduced HQ redox mediators (HQ-RMs) in t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/11/3027 |
| _version_ | 1827675773269442560 |
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| author | Sung Min Wi Jihong Kim Suok Lee Yu-Rim Choi Sung Hoon Kim Jong Bae Park Younghyun Cho Wook Ahn A-Rang Jang John Hong Young-Woo Lee |
| author_facet | Sung Min Wi Jihong Kim Suok Lee Yu-Rim Choi Sung Hoon Kim Jong Bae Park Younghyun Cho Wook Ahn A-Rang Jang John Hong Young-Woo Lee |
| author_sort | Sung Min Wi |
| collection | DOAJ |
| description | To effectively improve the energy density and reduce the self-discharging rate of micro-supercapacitors, an advanced strategy is required. In this study, we developed a hydroquinone (HQ)-based polymer-gel electrolyte (HQ-gel) for micro-supercapacitors. The introduced HQ redox mediators (HQ-RMs) in the gel electrolyte composites underwent additional Faradaic redox reactions and synergistically increased the overall energy density of the micro-supercapacitors. Moreover, the HQ-RMs in the gel electrolyte weakened the self-discharging behavior by providing a strong binding attachment of charged ions on the porous graphitized carbon electrodes after the redox reactions. The micro-supercapacitors with HQ gel (HQ-MSCs) showed excellent energy storage performance, including a high energy volumetric capacitance of 255 mF cm<sup>−3</sup> at a current of 1 µA, which is 2.7 times higher than the micro-supercapacitors based on bare-gel electrolyte composites without HQ-RMs (b-MSCs). The HQ-MSCs showed comparatively low self-discharging behavior with an open circuit potential drop of 37% compared to the b-MSCs with an open circuit potential drop of 60% after 2000 s. The assembled HQ-MSCs exhibited high mechanical flexibility over the applied external tensile and compressive strains. Additionally, the HQ-MSCs show the adequate circuit compatibility within series and parallel connections and the good cycling performance of capacitance retention of 95% after 3000 cycles. |
| first_indexed | 2024-03-10T05:12:31Z |
| format | Article |
| id | doaj.art-11051a7c873f4a7686b6916f614c1830 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T05:12:31Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-11051a7c873f4a7686b6916f614c18302023-11-23T00:42:05ZengMDPI AGNanomaterials2079-49912021-11-011111302710.3390/nano11113027A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge RateSung Min Wi0Jihong Kim1Suok Lee2Yu-Rim Choi3Sung Hoon Kim4Jong Bae Park5Younghyun Cho6Wook Ahn7A-Rang Jang8John Hong9Young-Woo Lee10Department of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaJeonju Centre, Korea Basic Science Institute, Jeonju 54907, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaDepartment of Electrical Engineering, Semyung University, Jecheon-si 27136, KoreaSchool of Materials Science and Engineering, Kookmin University, Seoul 02707, KoreaDepartment of Energy Systems Engineering, Soonchunhyang University, Asan-si 31538, KoreaTo effectively improve the energy density and reduce the self-discharging rate of micro-supercapacitors, an advanced strategy is required. In this study, we developed a hydroquinone (HQ)-based polymer-gel electrolyte (HQ-gel) for micro-supercapacitors. The introduced HQ redox mediators (HQ-RMs) in the gel electrolyte composites underwent additional Faradaic redox reactions and synergistically increased the overall energy density of the micro-supercapacitors. Moreover, the HQ-RMs in the gel electrolyte weakened the self-discharging behavior by providing a strong binding attachment of charged ions on the porous graphitized carbon electrodes after the redox reactions. The micro-supercapacitors with HQ gel (HQ-MSCs) showed excellent energy storage performance, including a high energy volumetric capacitance of 255 mF cm<sup>−3</sup> at a current of 1 µA, which is 2.7 times higher than the micro-supercapacitors based on bare-gel electrolyte composites without HQ-RMs (b-MSCs). The HQ-MSCs showed comparatively low self-discharging behavior with an open circuit potential drop of 37% compared to the b-MSCs with an open circuit potential drop of 60% after 2000 s. The assembled HQ-MSCs exhibited high mechanical flexibility over the applied external tensile and compressive strains. Additionally, the HQ-MSCs show the adequate circuit compatibility within series and parallel connections and the good cycling performance of capacitance retention of 95% after 3000 cycles.https://www.mdpi.com/2079-4991/11/11/3027hydroquinone-based polymer-gel electrolytemicro-supercapacitorsFaradaic redox reactionsenergy storage |
| spellingShingle | Sung Min Wi Jihong Kim Suok Lee Yu-Rim Choi Sung Hoon Kim Jong Bae Park Younghyun Cho Wook Ahn A-Rang Jang John Hong Young-Woo Lee A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate Nanomaterials hydroquinone-based polymer-gel electrolyte micro-supercapacitors Faradaic redox reactions energy storage |
| title | A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate |
| title_full | A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate |
| title_fullStr | A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate |
| title_full_unstemmed | A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate |
| title_short | A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate |
| title_sort | redox mediator integrated flexible micro supercapacitor with improved energy storage capability and suppressed self discharge rate |
| topic | hydroquinone-based polymer-gel electrolyte micro-supercapacitors Faradaic redox reactions energy storage |
| url | https://www.mdpi.com/2079-4991/11/11/3027 |
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