期刊
JOURNAL OF MEMBRANE SCIENCE
卷 564, 期 -, 页码 237-246出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.07.033
关键词
Vanadium flow battery; Sulfonated poly(ether ether ketone); Halloysite nanotubes; Physically cross-linked; Acid-base membrane
资金
- National Natural Science Foundation of China [21576154]
- Shenzhen Basic Research Project [JCYJ20170412170756603, JCYJ20170307152754218]
- Natural Science Foundation of Guangdong Province [2015A030313894]
The search for high-performance, stable, and cost-efficient membranes for vanadium flow battery (VFB) has attracted great interest. Herein, we report a physically cross-linked acid-base membrane composed of sulfonated poly(ether ether ketone) (SPEEK) and dopamine-modified halloysite nanotubes (DHNTs). The hollow structure of DHNTs allows the polymer chains getting into the lumen to form a robust mesh structure inside the composite membrane, resulting in improved mechanical stability. Meanwhile, the interface acid-base interaction between DHNTs and SPEEK facilitates the hopping of protons, leading to enhanced proton conductivity. Due to the bifunctional effects of DHNTs, the VFB with an optimized S/DHNTs 3% membrane exhibits outstanding rate performance at 40-200 mA cm(-2) and excellent durability over 500 cycles at 160 mA cm(-2), including extremely stable coulombic efficiency (similar to 99%) and energy efficiency (similar to 78%) along with very slow capacity decay rate (0.099% per cycle). The above results demonstrate that the S/DHNTs composite membrane has great advantages and broad prospects for VFB applications.
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