期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 21, 页码 18885-18893出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5047125
关键词
vanadium redox flow battery; blend membrane; sulfonated poly(ether ether ketone); polyacrylonitrile; acid-base interaction
资金
- National Basic Research Program of China [2009CB220105, 2013CB934000]
- National Natural Science Foundation of China [21273129, 20973099]
- Shenzhen Science Fund for Distinguished Young Scholars [JC201104210149A]
- Shenzhen Basic Research Project [CXZZ20130322164607310, JCYJ20130402145002403, JCYJ20120830152316442]
Acid-base blend membrane prepared from sulfonated poly(ether ether ketone) (SPEEK) and polyacrylonitrile (PAN) was detailedly evaluated for vanadium redox flow battery (VRFB) application. SPEEK/PAN blend membrane exhibited dense and homogeneous cross-section morphology as scanning electron microscopy and energy-dispersive X-ray spectroscopy images show. The acid-base interaction of ionic cross-linking and hydrogen bonding between SPEEK and PAN could effectively reduce water uptake, swelling ratio, and vanadium ion permeability, and improve the performance and stability of blend membrane. Because of the good balance of proton conductivity and vanadium ion permeability, blend membrane with 20 wt % PAN (S/PAN-20%) showed higher Coulombic efficiency (96.2% vs 91.1%) and energy efficiency (83.5% vs 78.4%) than Nafion 117 membrane at current density of 80 mA cm(-2) when they were used in VRFB single cell. Besides, S/PAN-20% membrane kept a stable performance during 150 cycles at current density of 80 mA cm(-2) in the cycle life test. Hence the SPEEK/PAN acid-base blend membrane could be used as promising candidate for VRFB application.
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