期刊
CHEMICAL ENGINEERING SCIENCE
卷 250, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.117402
关键词
Electrochemistry; Electron-ion transfer; Reactive interface; Flow battery
资金
- National Key Research and Development Program of China [2019YFA0210300]
- Distin-guished Scientist Program at BUCT
This study constructs a multi-structured semi-solid anode by packaging multi-layered graphite felt and zinc slurry based on microporous carbon wrapped nano-ZnO (ZnO@MC). The semi-solid anode exhibits high electrochemical activity and stability in zinc-iron flow batteries, making it a promising candidate for practical applications.
Aqueous zinc-based flow battery has advantages of low cost, high safety and abundant reservoir, showing a good application prospect. However, zinc dendrites remain a big issue to their cycling stability. Herein, we construct a multi-structured semi-solid anode by packaging multi-layered graphite felt and zinc slurry based on microporous carbon wrapped nano-ZnO (ZnO@MC). ZnO@MC is prepared by polymerizing dopamine on nano-ZnO and followed calcination. Microporous carbon shells act as restriction spaces, forbidding either oxidized or reduced zinc species flow out, but also serve as the first electron network. Meanwhile, carbon black and graphite felt function as the second and third electron networks. Besides, trace alkaline solutions deliver hydroxyl ions. Thus, the redox of zinc species proceeds in microporous carbon shells without zinc dendrites. Resultantly, semi-solid anode has high electrochemical activity and stability in zinc-iron flow batteries. The average efficiency is 74.8% with negligible fluctuations over 840 h (460 cycles).(c) 2021 Elsevier Ltd. All rights reserved.
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