期刊
JOURNAL OF ENERGY STORAGE
卷 42, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2021.103037
关键词
Zn anode; Graphene; Zinc ion hybrid supercapacitors; Zn dendrites
资金
- National Natural Science Foundation of China [52062012]
- Key Research and Development Project of Hainan Province [ZDYF2020028]
- Innovation Team of Universities of Guangdong Province [2020KCXTD011]
- Engineering Research Center of Universities of Guangdong Province [2019GCZX002]
- Guangdong Key Laboratory for Hydrogen Energy Technologies [2018B030322005]
The use of graphene as surface layer on zinc foil in Zinc ion hybrid supercapacitors (ZIHS) successfully inhibits dendrite formation and significantly improves cyclic stability, leading to an ultra-long cycle life compared to traditional zinc foil anodes. The abundance of active sites on graphene facilitates uniform zinc deposition, contributing to the enhanced performance of the electrode.
Zinc ion hybrid supercapacitors (ZIHS) are promising aqueous energy storage devices due to their low-cost and excellent long cyclic stability. However, the poor stability caused by growth of zinc (Zn) dendrite due to Zn uneven deposition/stripping, which limits the applications of ZIHS. Hence, graphene is constructed as surface layer of Zn foil to inhibit the formation of protuberances and improve the cycle life of ZIHS. Moreover, the cyclic life of graphene@Zn anode in ZIHS at 1 A g(-1) reaches at least 10,000 cycles, 200-fold higher than that of Zn foil anode. The ultra-long life of graphene@Zn electrode is attributed to abundant active sites on graphene for Zn2+ nucleation and subsequently uniform deposition. Importantly, graphene layers not only inhibit dendrites by guiding uniform Zn deposition, but also reduce the side-reactions by blocking the electrolyte. Overall, the proposed method to improve reversibility and cyclic stability of Zn anode looks promising for the development of large-scale ZIHS.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据