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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MDPI AG
2021
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oai:doaj.org-article:11051a7c873f4a7686b6916f614c18302021-11-25T18:31:50ZA Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate10.3390/nano111130272079-4991https://doaj.org/article/11051a7c873f4a7686b6916f614c18302021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3027https://doaj.org/toc/2079-4991To 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.Sung Min WiJihong KimSuok LeeYu-Rim ChoiSung Hoon KimJong Bae ParkYounghyun ChoWook AhnA-Rang JangJohn HongYoung-Woo LeeMDPI AGarticlehydroquinone-based polymer-gel electrolytemicro-supercapacitorsFaradaic redox reactionsenergy storageChemistryQD1-999ENNanomaterials, Vol 11, Iss 3027, p 3027 (2021) |
| institution |
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DOAJ |
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EN |
| topic |
hydroquinone-based polymer-gel electrolyte micro-supercapacitors Faradaic redox reactions energy storage Chemistry QD1-999 |
| spellingShingle |
hydroquinone-based polymer-gel electrolyte micro-supercapacitors Faradaic redox reactions energy storage Chemistry QD1-999 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 |
| 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. |
| format |
article |
| 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 |
| title |
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_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_sort |
redox-mediator-integrated flexible micro-supercapacitor with improved energy storage capability and suppressed self-discharge rate |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/11051a7c873f4a7686b6916f614c1830 |
| work_keys_str_mv |
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