Abstract
The effect of surface modification modes on proton-over-vanadium ion selectivity was studied by spin-coating chitosan-Phosphotungstic Acid (PWA) as a single or double layer on Nafion membrane surface. To suppress the vanadium ions permeation through the Nafion? membrane in a vanadium redox flow battery (VRFB), the single surface-modified Nafion membrane (Nafion/chitosan-PWA)S and double surface-modified Nafion membrane (Nafion/chitosan-PWA)D demonstrated a 89.9% and 92.7% reduction of vanadium ion permeability in comparison with pristine Nafion, respectively. The (Nafion/chitosan-PWA)D exhibited betterhigher selectivity between proton and vanadium ions than the (Nafion/chitosan-PWA)S at the same layer thickness. Furthermore, the columbic efficiency for the VRFB single cell based on the (Nafion/chitosan-PWA)D at an optimized thickness was 93.5% and the energy efficiency was 80.7% at a charge-discharge current density of 30 mA·cm-2, which wereas higher than the (Nafion/chitosan-PWA)S and pristine Nafion membrane. The modified membranes also possessed adequate chemical stability in the VRFB during charge-discharge cycling measurements.
Graphical Abstract
Keywords
Surface modification mode, Vanadium ion permeability, Ionic selectivity, Vanadium redox flow battery
Publication Date
2017-08-25
Online Available Date
2016-04-22
Revised Date
2016-04-06
Received Date
2016-03-07
Recommended Citation
Qing-long TAN, Hai-ning WANG, Shan-fu LU, Da-wei LIANG, Chun-xiao WU, Yan XIANG.
Effects of surface modification modes on proton-over-vanadium ion selectivity of Nafion®membrane for application in vanadium redox flow battery[J]. Journal of Electrochemistry,
2017
,
23(4): 160307.
DOI: 10.13208/j.electrochem.160307
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol23/iss4/15
Included in
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