期刊
CHEMICAL ENGINEERING JOURNAL
卷 445, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136796
关键词
Zn -ion hybrid supercapacitors; Dual redox-active ions enhanced electrolytes
资金
- National Key Research and Development Program of China [2018YFB1502900]
- Zhejiang Provincial Natural Science Foundation of China [LY19B060006, LQ20B050003, LQ20E030016]
- Innovation Jiaxing Elite Leadership Plan and Technology Development Project of Jiaxing University, Research Funding of Jiaxing University [CD70519058, 00520138]
This study proposes novel aqueous Zn-ion hybrid supercapacitors with dual redox-active ions enhanced electrolytes, resulting in a significantly higher specific capacity compared to traditional Zn-ion hybrid supercapacitors.
Aqueous Zn-ion hybrid supercapacitors are promising, competitive, environmentally friendly, and safe energy storage systems. However, the low capacity of such supercapacitors cannot satisfy current technological requirements for economic and social development. In this study, novel aqueous Zn-ion hybrid supercapacitors are proposed. In these supercapacitors, the dual redox-active ions enhanced electrolytes, porous sheet carbons, and Zn foils were used as the electrolytes, positive electrodes, and negative electrodes, respectively. Dual redox-active ions in the electrolytes can participate in electrochemical energy storage, which considerably increases the specific capacity of such devices. A high specific capacity of 1.25 mAh/cm2 (312.2 mAh/g) is achieved at 0.8 mA/cm2 for dual redox-active ions (Mn2+ and Br-). This capacity is 2.66 times higher than those of Zn-ion hybrid supercapacitors without redox-active ions and exceeded most reported values in literature.
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