کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7020048 | 1455947 | 2018 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Commercial perfluorosulfonic acid membranes for vanadium redox flow battery: Effect of ion-exchange capacity and membrane internal structure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A series of perfluorosulfonic membranes is screened for application in vanadium redox flow batteries (VRFB): membranes of constant thickness 50â¯Âµm with different ion-exchange capacities ranging from 0.56 to 1.15â¯molâ¯eq.â¯gâ1. Diffusion flux of each vanadium ion occurring in VRFB electrolytes through each examined membrane is measured by UV/Vis spectroscopy. Permeation of V2+ ions contributes most to the self-discharge losses and the mechanism of vanadium ions permeation is discussed for all oxidation states. The membranes are characterized in the single-cell by electrochemical impedance spectroscopy, load curve measurements with linearly increasing current and charge-discharge cycles at various current densities ranging from 50 to 200â¯mAâ¯cmâ2. Generally, at lower current densities the permeation of vanadium ions decreases the battery efficiency and thus lower ion-exchange capacity membranes are more suitable. Concurrently, at higher current densities the battery efficiency is decreased by the membrane resistance and thus higher ion-exchange capacity membranes are optimal. However, membrane ion-exchange capacity is not the only characteristic that affects the VRFB performance. Small-angle X-ray scattering of membranes revealed the effect of polymer molecular architecture on the size of hydrophilic domains which affects the membrane transport properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 552, 15 April 2018, Pages 202-212
Journal: Journal of Membrane Science - Volume 552, 15 April 2018, Pages 202-212
نویسندگان
JiÅà Vrána, JiÅà Charvát, Petr Mazúr, Petr BÄlský, Jan Dundálek, JaromÃr PocediÄ, Juraj Kosek,