Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives
Redox additives have been widely used in various electrolytes to achieve an increase in the energy density of hybrid capacitors. This study investigates the trade-off mechanism of energy density and cycle stability for electrochemical capacitors with redox additives. To do so, a 1-dimensional electr...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Next Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949821X25000067 |
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| author | Jingyu Li Bing-Ang Mei Huihua Feng Zhengxing Zuo Rui Xiong |
| author_facet | Jingyu Li Bing-Ang Mei Huihua Feng Zhengxing Zuo Rui Xiong |
| author_sort | Jingyu Li |
| collection | DOAJ |
| description | Redox additives have been widely used in various electrolytes to achieve an increase in the energy density of hybrid capacitors. This study investigates the trade-off mechanism of energy density and cycle stability for electrochemical capacitors with redox additives. To do so, a 1-dimensional electrochemical model considering both electric double layer and redox actions is performed for carbon-based hybrid capacitors with electrolyte of 1 mol L−1 tetraethylammonium tetrafluoroborate/acetonitrile and redox additives hydroquinone. The results show that electrochemical capacitors with redox additives worked in either Faradaic or capacitive regimes, distinguished by the “capacitor-like” or “battery-like” potential-time curve. In addition, the energy density of the device increased with the increase in concentration of hydroquinone and the decrease in imposed current density. The temporal evolution of Coulombic efficiency and spatial average concentration of hydroquinone over cycles indicate a transition from developing state to steady state. The number of cycles required for both parameters to stabilize is identical. Finally, the Faradaic regime is favored for energy density improvement. On the other hand, highly weighted cycle stability could allow relatively higher imposed current density. The results of this study can be used to further guide the design and optimization of hybrid electrochemical systems with redox additives. |
| format | Article |
| id | doaj-art-07305328473b4215862852c7d33cc3f5 |
| institution | Kabale University |
| issn | 2949-821X |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Next Energy |
| spelling | doaj-art-07305328473b4215862852c7d33cc3f52025-02-05T04:32:55ZengElsevierNext Energy2949-821X2025-07-018100243Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additivesJingyu Li0Bing-Ang Mei1Huihua Feng2Zhengxing Zuo3Rui Xiong4School of Mechanical Engineering Beijing Institute of Technology, Beijing 100081, ChinaCorresponding author.; School of Mechanical Engineering Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering Beijing Institute of Technology, Beijing 100081, ChinaRedox additives have been widely used in various electrolytes to achieve an increase in the energy density of hybrid capacitors. This study investigates the trade-off mechanism of energy density and cycle stability for electrochemical capacitors with redox additives. To do so, a 1-dimensional electrochemical model considering both electric double layer and redox actions is performed for carbon-based hybrid capacitors with electrolyte of 1 mol L−1 tetraethylammonium tetrafluoroborate/acetonitrile and redox additives hydroquinone. The results show that electrochemical capacitors with redox additives worked in either Faradaic or capacitive regimes, distinguished by the “capacitor-like” or “battery-like” potential-time curve. In addition, the energy density of the device increased with the increase in concentration of hydroquinone and the decrease in imposed current density. The temporal evolution of Coulombic efficiency and spatial average concentration of hydroquinone over cycles indicate a transition from developing state to steady state. The number of cycles required for both parameters to stabilize is identical. Finally, the Faradaic regime is favored for energy density improvement. On the other hand, highly weighted cycle stability could allow relatively higher imposed current density. The results of this study can be used to further guide the design and optimization of hybrid electrochemical systems with redox additives.http://www.sciencedirect.com/science/article/pii/S2949821X25000067Redox additivesHybrid capacitorFaradaic regimeEnergy densityCycle stability |
| spellingShingle | Jingyu Li Bing-Ang Mei Huihua Feng Zhengxing Zuo Rui Xiong Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives Next Energy Redox additives Hybrid capacitor Faradaic regime Energy density Cycle stability |
| title | Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| title_full | Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| title_fullStr | Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| title_full_unstemmed | Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| title_short | Understanding the trade-off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| title_sort | understanding the trade off mechanisms of energy storage and cycle stability for hybrid electrochemical capacitors with redox additives |
| topic | Redox additives Hybrid capacitor Faradaic regime Energy density Cycle stability |
| url | http://www.sciencedirect.com/science/article/pii/S2949821X25000067 |
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