Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 13, Pages 5737-5741Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.02.048
Keywords
Polymer blends; Ion exchange membranes; Vanadium redox flow battery
Funding
- National Basic Research Program of China (973 program) [2010CB227202]
- DICP [K2010B2]
- Knowledge Innovation of Chinese Academy of Sciences [KGCX2-YW-398-1]
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Nafion/PVDF blends are employed to prepare the ion exchange membranes for vanadium redox flow battery (VRB) application for the first time. The addition of the highly crystalline and hydrophobic PVDF effectively confines the swelling behavior of Nafion. In VRB single cell test, the Nafion/PVDF binary membranes exhibit higher columbic efficiency than recast Nafion at various current densities. The blend membrane with 20 wt% of PVDF (N(0.8)P(0.2)) shows energy efficiency of 85% at 80 mA cm(-2), which is superior to that of recast Nafion. N(0.8)P(0.2) membrane also possesses twice longer duration in OCV decay test and much lower permeation of VO(2+) compared with recast Nafion. These results indicate that the addition of PVDF is a simple and efficient way to improve the ion selectivity of Nafion, and the polymer blends with optimized mass fraction of PVDF show good potential for VRB application. (C) 2011 Elsevier B.V. All rights reserved.
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