کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7733293 1497950 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultra-low vanadium ion diffusion amphoteric ion-exchange membranes for all-vanadium redox flow batteries
ترجمه فارسی عنوان
غشاهای تبادل یونی آمفافیک با وانادیوم پایین برای باطری های جریان برگشتی همه وانادیم
کلمات کلیدی
فلوئورو متیل سولفون شده پلی (آرویلن اتر کتون)، غشای تبادل یونی آمفوتریک، نفوذپذیری بسیار کم وانادیوم، بازده کولومیک بالا، باطری جریان بازو وانادیم،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
An amphoteric ion-exchange membrane (AIEM) from fluoro-methyl sulfonated poly(arylene ether ketone) bearing content-controlled benzimidazole moiety, was firstly fabricated for vanadium redox flow battery (VRB). The AIEM and its covalently cross-linked membrane (AIEM-c) behave the highly suppressed vanadium-ion crossover and their tested VO2+ permeability are about 638 and 1117 times lower than that of Nafion117, respectively. This is further typically verified by the lower VO2+ concentration inside AIEM that is less than half of that inside Nafion117 detected by energy dispersive X-ray spectrometry, in addition of the nearly 3 times longer battery self-discharge time. The ultra-low vanadium ion diffusion could be ascribed to the narrower ion transporting channel originated from the acid-base interactions and the rebelling effect between the positively-charged benzimidazole structure and VO2+ ions. It is found that, VRB assembled with AIEM exhibits the equal or higher Coulombic efficiency (99.0% vs. 96.4%), voltage efficiency (90.7% vs. 90.7%) and energy efficiency (89.8% vs. 87.4%) than that with Nafion117 and keeps continuous 220 charge-discharge cycles for over 25 days, confirming that the AIEM of this type is a potentially suitable separator for VRB application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 282, 15 May 2015, Pages 241-247
نویسندگان
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